Metamagnetism of Weakly-Coupled Antiferromagnetic Topological
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United States Patent Application 20110255645 Kind Code A1 Zawodny; Joseph M
( 1 of 1 ) United States Patent Application 20110255645 Kind Code A1 Zawodny; Joseph M. October 20, 2011 Method for Producing Heavy Electrons Abstract A method for producing heavy electrons is based on a material system that includes an electrically-conductive material is selected. The material system has a resonant frequency associated therewith for a given operational environment. A structure is formed that includes a non-electrically-conductive material and the material system. The structure incorporates the electrically-conductive material at least at a surface thereof. The geometry of the structure supports propagation of surface plasmon polaritons at a selected frequency that is approximately equal to the resonant frequency of the material system. As a result, heavy electrons are produced at the electrically-conductive material as the surface plasmon polaritons propagate along the structure. Inventors: Zawodny; Joseph M.; (Poquoson, VA) Assignee: USA as represented by the Administrator of the National Aeronautics and Space Administration Washington DC Family ID: 44788191 Serial No.: 070552 Series 13 Code: Filed: March 24, 2011 Current U.S. Class: 376/108 Class at Publication: 376/108 Current CPC Class: G21B 3/00 20130101; Y02E 30/18 20130101 International Class: G21B 1/00 20060101 G21B001/00 Goverment Interests STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] The invention was made by an employee of the United States Government and may be manufactured and used by or for the Government of the United States of -
Solid State Physics 2 Lecture 5: Electron Liquid
Physics 7450: Solid State Physics 2 Lecture 5: Electron liquid Leo Radzihovsky (Dated: 10 March, 2015) Abstract In these lectures, we will study itinerate electron liquid, namely metals. We will begin by re- viewing properties of noninteracting electron gas, developing its Greens functions, analyzing its thermodynamics, Pauli paramagnetism and Landau diamagnetism. We will recall how its thermo- dynamics is qualitatively distinct from that of a Boltzmann and Bose gases. As emphasized by Sommerfeld (1928), these qualitative di↵erence are due to the Pauli principle of electons’ fermionic statistics. We will then include e↵ects of Coulomb interaction, treating it in Hartree and Hartree- Fock approximation, computing the ground state energy and screening. We will then study itinerate Stoner ferromagnetism as well as various response functions, such as compressibility and conduc- tivity, and screening (Thomas-Fermi, Debye). We will then discuss Landau Fermi-liquid theory, which will allow us understand why despite strong electron-electron interactions, nevertheless much of the phenomenology of a Fermi gas extends to a Fermi liquid. We will conclude with discussion of electrons on the lattice, treated within the Hubbard and t-J models and will study transition to a Mott insulator and magnetism 1 I. INTRODUCTION A. Outline electron gas ground state and excitations • thermodynamics • Pauli paramagnetism • Landau diamagnetism • Hartree-Fock theory of interactions: ground state energy • Stoner ferromagnetic instability • response functions • Landau Fermi-liquid theory • electrons on the lattice: Hubbard and t-J models • Mott insulators and magnetism • B. Background In these lectures, we will study itinerate electron liquid, namely metals. In principle a fully quantum mechanical, strongly Coulomb-interacting description is required. -
Study of Spin Glass and Cluster Ferromagnetism in Rusr2eu1.4Ce0.6Cu2o10-Δ Magneto Superconductor Anuj Kumar, R
Study of spin glass and cluster ferromagnetism in RuSr2Eu1.4Ce0.6Cu2O10-δ magneto superconductor Anuj Kumar, R. P. Tandon, and V. P. S. Awana Citation: J. Appl. Phys. 110, 043926 (2011); doi: 10.1063/1.3626824 View online: http://dx.doi.org/10.1063/1.3626824 View Table of Contents: http://jap.aip.org/resource/1/JAPIAU/v110/i4 Published by the American Institute of Physics. Related Articles Annealing effect on the excess conductivity of Cu0.5Tl0.25M0.25Ba2Ca2Cu3O10−δ (M=K, Na, Li, Tl) superconductors J. Appl. Phys. 111, 053914 (2012) Effect of columnar grain boundaries on flux pinning in MgB2 films J. Appl. Phys. 111, 053906 (2012) The scaling analysis on effective activation energy in HgBa2Ca2Cu3O8+δ J. Appl. Phys. 111, 07D709 (2012) Magnetism and superconductivity in the Heusler alloy Pd2YbPb J. Appl. Phys. 111, 07E111 (2012) Micromagnetic analysis of the magnetization dynamics driven by the Oersted field in permalloy nanorings J. Appl. Phys. 111, 07D103 (2012) Additional information on J. Appl. Phys. Journal Homepage: http://jap.aip.org/ Journal Information: http://jap.aip.org/about/about_the_journal Top downloads: http://jap.aip.org/features/most_downloaded Information for Authors: http://jap.aip.org/authors Downloaded 12 Mar 2012 to 14.139.60.97. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions JOURNAL OF APPLIED PHYSICS 110, 043926 (2011) Study of spin glass and cluster ferromagnetism in RuSr2Eu1.4Ce0.6Cu2O10-d magneto superconductor Anuj Kumar,1,2 R. P. Tandon,2 and V. P. S. Awana1,a) 1Quantum Phenomena and Application Division, National Physical Laboratory (CSIR), Dr. -
Structural Chemistry and Metamagnetism of an Homologous Series of Layered Manganese Oxysulfides Zolta´Na.Ga´L,† Oliver J
Published on Web 06/10/2006 Structural Chemistry and Metamagnetism of an Homologous Series of Layered Manganese Oxysulfides Zolta´nA.Ga´l,† Oliver J. Rutt,† Catherine F. Smura,† Timothy P. Overton,† Nicolas Barrier,† Simon J. Clarke,*,† and Joke Hadermann‡ Contribution from the Department of Chemistry, UniVersity of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, U.K., and Electron Microscopy for Materials Science (EMAT), UniVersity of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium Received February 7, 2006; E-mail: [email protected] Abstract: An homologous series of layered oxysulfides Sr2MnO2Cu2m-δSm+1 with metamagnetic properties is described. Sr2MnO2Cu2-δS2 (m ) 1), Sr2MnO2Cu4-δS3 (m ) 2) and Sr2MnO2Cu6-δS4 (m ) 3), consist of 2+ MnO2 sheets separated from antifluorite-type copper sulfide layers of variable thickness by Sr ions. All three compounds show substantial and similar copper deficiencies (δ ≈ 0.5) in the copper sulfide layers, and single-crystal X-ray and powder neutron diffraction measurements show that the copper ions in the m ) 2 and m ) 3 compounds are crystallographically disordered, consistent with the possibility of high two-dimensional copper ion mobility. Magnetic susceptibility measurements show high-temperature Curie- Weiss behavior with magnetic moments consistent with high spin manganese ions which have been oxidized to the (2+δ)+ state in order to maintain a full Cu-3d/S-3p valence band, and the compounds are correspondingly p-type semiconductors with resistivities around 25 Ω cm at 295 K. Positive Weiss temperatures indicate net ferromagnetic interactions between moments. Accordingly, magnetic susceptibility measurements and low-temperature powder neutron diffraction measurements show that the moments within a MnO2 sheet couple ferromagnetically and that weaker antiferromagnetic coupling between sheets leads to A-type antiferromagnets in zero applied magnetic field. -
Condensation of Bosons with Several Degrees of Freedom Condensación De Bosones Con Varios Grados De Libertad
Condensation of bosons with several degrees of freedom Condensación de bosones con varios grados de libertad Trabajo presentado por Rafael Delgado López1 para optar al título de Máster en Física Fundamental bajo la dirección del Dr. Pedro Bargueño de Retes2 y del Prof. Fernando Sols Lucia3 Universidad Complutense de Madrid Junio de 2013 Calificación obtenida: 10 (MH) 1 [email protected], Dep. Física Teórica I, Universidad Complutense de Madrid 2 [email protected], Dep. Física de Materiales, Universidad Complutense de Madrid 3 [email protected], Dep. Física de Materiales, Universidad Complutense de Madrid Abstract The condensation of the spinless ideal charged Bose gas in the presence of a magnetic field is revisited as a first step to tackle the more complex case of a molecular condensate, where several degrees of freedom have to be taken into account. In the charged bose gas, the conventional approach is extended to include the macroscopic occupation of excited kinetic states lying in the lowest Landau level, which plays an essential role in the case of large magnetic fields. In that limit, signatures of two diffuse phase transitions (crossovers) appear in the specific heat. In particular, at temperatures lower than the cyclotron frequency, the system behaves as an effectively one-dimensional free boson system, with the specific heat equal to (1/2) NkB and a gradual condensation at lower temperatures. In the molecular case, which is currently in progress, we have studied the condensation of rotational levels in a two–dimensional trap within the Bogoliubov approximation, showing that multi–step condensation also occurs. -
Pauli Paramagnetism of an Ideal Fermi Gas
Pauli paramagnetism of an ideal Fermi gas The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Lee, Ye-Ryoung, Tout T. Wang, Timur M. Rvachov, Jae-Hoon Choi, Wolfgang Ketterle, and Myoung-Sun Heo. "Pauli paramagnetism of an ideal Fermi gas." Phys. Rev. A 87, 043629 (April 2013). © 2013 American Physical Society As Published http://dx.doi.org/10.1103/PhysRevA.87.043629 Publisher American Physical Society Version Final published version Citable link http://hdl.handle.net/1721.1/88740 Terms of Use Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. PHYSICAL REVIEW A 87, 043629 (2013) Pauli paramagnetism of an ideal Fermi gas Ye-Ryoung Lee,1 Tout T. Wang,1,2 Timur M. Rvachov,1 Jae-Hoon Choi,1 Wolfgang Ketterle,1 and Myoung-Sun Heo1,* 1MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA (Received 7 January 2013; published 24 April 2013) We show how to use trapped ultracold atoms to measure the magnetic susceptibility of a two-component Fermi gas. The method is illustrated for a noninteracting gas of 6Li, using the tunability of interactions around a wide Feshbach resonance. The susceptibility versus effective magnetic field is directly obtained from the inhomogeneous density profile of the trapped atomic cloud. The wings of the cloud realize the high-field limit where the polarization approaches 100%, which is not accessible for an electron gas. -
Low-Field-Enhanced Unusual Hysteresis Produced By
PHYSICAL REVIEW B 94, 184427 (2016) Low-field-enhanced unusual hysteresis produced by metamagnetism of the MnP clusters in the insulating CdGeP2 matrix under pressure T. R. Arslanov,1,* R. K. Arslanov,1 L. Kilanski,2 T. Chatterji,3 I. V. Fedorchenko,4,5 R. M. Emirov,6 and A. I. Ril5 1Amirkhanov Institute of Physics, Daghestan Scientific Center, Russian Academy of Sciences (RAS), 367003 Makhachkala, Russia 2Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland 3Institute Laue-Langevin, Boˆıte Postale 156, 38042 Grenoble Cedex 9, France 4Kurnakov Institute of General and Inorganic Chemistry, RAS, 119991 Moscow, Russia 5National University of Science and Technology MISiS, 119049, Moscow, Russia 6Daghestan State University, Faculty of Physics, 367025 Makhachkala, Russia (Received 11 April 2016; revised manuscript received 28 October 2016; published 22 November 2016) Hydrostatic pressure studies of the isothermal magnetization and volume changes up to 7 GPa of magnetic composite containing MnP clusters in an insulating CdGeP2 matrix are presented. Instead of alleged superparamagnetic behavior, a pressure-induced magnetization process was found at zero magnetic field, showing gradual enhancement in a low-field regime up to H 5 kOe. The simultaneous application of pressure and magnetic field reconfigures the MnP clusters with antiferromagnetic alignment, followed by onset of a field-induced metamagnetic transition. An unusual hysteresis in magnetization after pressure cycling is observed, which is also enhanced by application of the magnetic field, and indicates reversible metamagnetism of MnP clusters. We relate these effects to the major contribution of structural changes in the composite, where limited volume reduction by 1.8% is observed at P ∼ 5.2 GPa. -
Energy and Charge Transfer in Open Plasmonic Systems
Energy and Charge Transfer in Open Plasmonic Systems Niket Thakkar A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Washington 2017 Reading Committee: David J. Masiello Randall J. LeVeque Mathew J. Lorig Daniel R. Gamelin Program Authorized to Offer Degree: Applied Mathematics ©Copyright 2017 Niket Thakkar University of Washington Abstract Energy and Charge Transfer in Open Plasmonic Systems Niket Thakkar Chair of the Supervisory Committee: Associate Professor David J. Masiello Chemistry Coherent and collective charge oscillations in metal nanoparticles (MNPs), known as localized surface plasmons, offer unprecedented control and enhancement of optical processes on the nanoscale. Since their discovery in the 1950's, plasmons have played an important role in understanding fundamental properties of solid state matter and have been used for a variety of applications, from single molecule spectroscopy to directed radiation therapy for cancer treatment. More recently, experiments have demonstrated quantum interference between optically excited plasmonic materials, opening the door for plasmonic applications in quantum information and making the study of the basic quantum mechanical properties of plasmonic structures an important research topic. This text describes a quantitatively accurate, versatile model of MNP optics that incorporates MNP geometry, local environment, and effects due to the quantum properties of conduction electrons and radiation. We build the theory from -
Metamagnetism in Linear Chain Electron-Transfer Salts Based on Decamethylferrocenium and Metal–Bis(Dichalcogenate) Acceptors
www.elsevier.com/locate/ica Inorganica Chimica Acta 326 (2001) 89–100 Metamagnetism in linear chain electron-transfer salts based on decamethylferrocenium and metal–bis(dichalcogenate) acceptors S. Rabac¸a a, R. Meira a, L.C.J. Pereira a, M. Teresa Duarte b, J.J. Novoa c, V. Gama a,* a Departamento Quı´mica, Instituto Tecnolo´gico e Nuclear, P-2686-953 Saca6e´m, Portugal b Departamento Engenharia Quı´mica, Instituto Superior Te´cnico, P-1049-001 Lisbon, Portugal c Departamento Quı´mica Fı´sica and CER Quimica Teo´rica, Uni6ersidad de Barcelona, A6. Diagonal 647, 08028 Barcelona, Spain Received 15 May 2001; accepted 12 September 2001 In memory of Professor Olivier Kahn Abstract The crystal structure of the electron-transfer (ET) salts [Fe(Cp*)2][M(tds)2], with M=Ni (1) and Pt (2), consists of an array of + − \ parallel alternating donors, [Fe(Cp*)2] , and acceptors, [M(tds)2] , ···DADADA···, stacks. For T 20 K, the magnetic susceptibility follows a Curie–Weiss behavior, with q values of 8.9 and 9.3 K for 1 and 2, respectively. A metamagnetic behavior was observed in 2, with TN =3.3 K and HC =3.95 kG at 1.7 K, resulting from a high magnetic anisotropy. A systematic study of the intra and interchain magnetic interactions was performed on 1, 2 and other ET salts based on decamethylferrocenium and on metal–bis(dichalcogenate) acceptors, with a similar crystal structure. The observed magnetic behavior of these compounds is consistent with the presence of strong ferromagnetic intrachain DA interactions and weaker antiferromagnetic interchain interactions, predicted by the McConnell I model. -
Superparamagnetic Nanoparticle Ensembles
1 Superparamagnetic nanoparticle ensembles O. Petracic Institute of Experimental Physics/Condensed Matter Physics, Ruhr-University Bochum, 44780 Bochum, Germany Abstract: Magnetic single-domain nanoparticles constitute an important model system in magnetism. In particular ensembles of superparamagnetic nanoparticles can exhibit a rich variety of different behaviors depending on the inter-particle interactions. Starting from isolated single-domain ferro- or ferrimagnetic nanoparticles the magnetization behavior of both non-interacting and interacting particle-ensembles is reviewed. A particular focus is drawn onto the relaxation time of the system. In case of interacting nanoparticles the usual Néel-Brown relaxation law becomes modified. With increasing interactions modified superparamagnetism, spin glass behavior and superferromagnetism are encountered. 1. Introduction Nanomagnetism is a vivid and highly interesting topic of modern solid state magnetism and nanotechnology [1-4]. This is not only due to the ever increasing demand for miniaturization, but also due to novel phenomena and effects which appear only on the nanoscale. That is e.g. superparamagnetism, new types of magnetic domain walls and spin structures, coupling phenomena and interactions between electrical current and magnetism (magneto resistance and current-induced switching) [1-4]. In technology nanomagnetism has become a crucial commercial factor. Modern magnetic data storage builds on principles of nanomagnetism and this tendency will increase in future. Also other areas of nanomagnetism are commercially becoming more and more important, e.g. for sensors [5] or biomedical applications [6]. Many potential future applications are investigated, e.g. magneto-logic devices [7], [8], photonic systems [9, 10] or magnetic refrigeration [11, 12]. 2 In particular magnetic nanoparticles experience a still increasing attention, because they can serve as building blocks for e.g. -
Table of Contents (Online, Part 1)
PERIODICALS PHYSICAL REVIEW BTM Postmaster send address changes to: For editorial and subscription correspondence, APS Subscription Services please see inside front cover Suite 1NO1 (ISSN: 1098-0121) 2 Huntington Quadrangle Melville, NY 11747-4502 THIRD SERIES, VOLUME 83, NUMBER 4 CONTENTS JANUARY 2011-15(II) RAPID COMMUNICATIONS Electronic structure and strongly correlated systems Signatures of Wigner localization in epitaxially grown nanowires (4 pages) ................................. 041101(R) L. H. Kristinsdottir,´ J. C. Cremon, H. A. Nilsson, H. Q. Xu, L. Samuelson, H. Linke, A. Wacker, and S. M. Reimann Suppression of metal-insulator transition at high pressure and pressure-induced magnetic ordering in pyrochlore oxide Nd2Ir2O7 (4 pages) ............................................................................ 041102(R) Masafumi Sakata, Tomoko Kagayama, Katsuya Shimizu, Kazuyuki Matsuhira, Seishi Takagi, Makoto Wakeshima, and Yukio Hinatsu LDA + DMFT study of Ru-based perovskite SrRuO3 and CaRuO3 (4 pages) ................................ 041103(R) E. Jakobi, S. Kanungo, S. Sarkar, S. Schmitt, and T. Saha-Dasgupta √ √ Geometrical frustration and the competing phases of the Sn/Si(111) 3 × 3R30◦ surface systems (4 pages) . 041104(R) Gang Li, Manuel Laubach, Andrzej Fleszar, and Werner Hanke Relativistic effects in a phosphorescent Ir(III) complex (4 pages) .......................................... 041105(R) A. R. G. Smith, M. J. Riley, S.-C. Lo, P. L. Burn, I. R. Gentle, and B. J. Powell Impurity scattering in a Luttinger liquid with electron-phonon coupling (4 pages) ............................ 041106(R) Alexey Galda, Igor V. Yurkevich, and Igor V. Lerner Semiconductors I: bulk Persistent polarization memory in sexithiophene nanostructures (4 pages) ................................... 041201(R) Benoit Gosselin, Vincent Cardin, Alexandre Favron, Jelissa De Jonghe, Laura-Isabelle Dion-Bertrand, Carlos Silva, and Richard Leonelli Candidates for topological insulators: Pb-based chalcogenide series (4 pages) .............................. -
Spin Canting, Metamagnetism, and Single-Chain Magnetic Behaviour in the Cyano-Bridged Homospin Iron(II) Compound
Electronic Supplementary Material (ESI) for ChemComm. This journal is © The Royal Society of Chemistry 2015 Electronic Supplementary Material (ESI) for Chem. Commun. This journal is © The Royal Society of Chemistry 2014 Spin canting, metamagnetism, and single-chain magnetic behaviour in the cyano-bridged homospin Iron(II) compound Dong Shao, Shao-Liang Zhang, Xin-hua Zhao, Xin-Yi Wang* † State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China. *Email: [email protected] Supporting Information 1 Table of contents: 1. Physical Measurements……………………………………………………………..3 2. Synthesis…………………………………………………………………………….3 3. X-ray crystallography……………………………………………………………….4 3.1 X-ray data collection, structure solution and refinement for 1 ……………………………4 Table S1 Crystallographic Data and Structure Refinement Parameters for 1 …………………5 Table S2 Selected Bond Lengths (Ǻ) and Bond Angles (deg) in 1 ……………………………6 Figure S1 The asymmetric unit of 1…………………………………………….……….……6 Figure S2 The packing diagram of 1 showing the interchain distances.………………………6 4. Magnetic Properties…………………………………………………………………………….7 Figure S3 Field-dependent isothermal magnetization curve for 1 below 7 K.…...……………7 Figure S4 The derivatives of the magnetization (dM /dH vs H) of 1 ……………….…………7 Figure S5 A series of magnetic susceptibility curves of 1 measured at different dc fields.…...8 Figure S6 Frequency dependence of χ' and χ" of the ac susceptibility for 1 at different temperatures at 0 or 2200 Oe dc fields.