In-Situ Observation of Abstract Production Rate
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Synchrotron Radiation in Natural Science Vol. 12, No. 1 – 2 (2013) Pb1-xSnxSe topological crystalline insulator: a new kind of quantum material A synchrotron-based Polish-Swedish collaboration results in experimental evidences for recent theoretical predictions experiment both the open-gap topologically trivial case (Fig. 2a) and open-inverted-gap with topologically nontrivial properties (Fig. 2b). In the ARPES studies carried out for crystals with Sn composition of x=0.23 in the synchrotron laboratory MAX-lab, Lund, Sweden and in the photoelectron spectroscopy laboratory of KTH, Kista, Sweden the band inversion was achieved at TC = 150 K. Below the inversion temperature one observed the formation of topological states with Dirac-like energy dispersion and Figure 1. A monocrystal of Pb0.77Sn0.23Se obtained by the Dirac cone centered in the vicinity of the X point of the self-selecting vapour growth method. the surface Brillouin zone [3]. Thus, the presence of the gapless Dirac-like states on the surface of Pb1-xSnxSe The existence of topologically protected surface proved that this narrow-gap semiconducting solid states with the Dirac-like dispersion on the (100) surface solution belongs to the new class of TCI. of Pb1-xSnxSe monocrystals has been recently proven by the angle-resolved photoelectron spectroscopy (ARPES) experiments [1]. The discovery of new quantum materials – topological insulators (TI) (one of the most important recent developments in condensed-matter physics) showed that time-reversal symmetry and strong relativistic (spin-orbit) effects led to presence of metallic helical Dirac-like electronic states on surfaces of some particular crystals, like Bi2Te3 or Bi2Se3.The further theoretical developments in analysis of conditions necessary for occurrence of particular properties characteristic of TI led to widening the class of suitable materials by topological crystalline insulators (TCI), in which specific crystalline symmetries warrant the topological protection of metallic surface states [2,3]. A Figure 2. group of IV-VI semiconductors, in particular SnTe, was (a) ARPES spectrum of the surface states taken for the indicated as possible examples of TCIs [3]. Pb1-xSnxSe gapped semiconductor phase of Pb0.77Sn0.23Se across monocrystals (Fig. 1) grown in the Institute of Physics, the point at which the topologically protected surface Polish Academy of Sciences, and chosen for the states of TCI (with the Dirac-like dispersion) occur in the vicinity of the point of the surface Brillouin zone experiments reported in [1], offer advantageous (see (b)). conditions for search for surface states of the TCI phase. The increasing Sn content leads to closing the energy gap (b) ARPES spectrum across the topologically protected surface states of TCI Pb0.77Sn0.23Se observed in the at some specific crystal composition xc. For higher Sn vicinity of the point. contents, the gap opens again but the parity of electronic states at band edges is reversed. Therefore, the idea was The subsequent spin-resolved ARPES experiments developed in the Institute of Physics, Polish Academy of allowed to show also the existence of spin polarization Sciences to perform thorough investigations of the band around the X point in the surface Brillouin zone in the structure evolution in these materials. As the topological TCI phase of Pb0.73Sn0.27Se. The results were consistent phase transition can also be easily tuned by temperature, with the results of tight binding band structure in these crystals it is possible to study in one ARPES calculations [4]. B.J. Kowalski, R. Buczko, and T. Story 1 P. Dziawa, B.J. Kowalski, K. Dybko, R. Buczko, A. Szczerbakow, M. Institute of Physics PAS Szot, E. Łusakowska, T. Balasubramanian, B.M. Wojek, M.H. Berntsen, O. Tjernberg, T. Story, Nature Materials 11, 1023 (2012) 2 L. Fu, Phys. Rev. Lett. 106, 106802 (2011) 4 B.M. Wojek, R. Buczko, S. Safaei, P. Dziawa, B.J. Kowalski, M.H. 3 T.H. Hsieh, H. Lin, J. Liu, W. Duan, A. Bansil, L. Fu, Nature Berntsen, T. Balasubramanian, M. Leandersson, A. Szczerbakow, P. Commun. 3, 982 (2012) Kacman, T. Story, O. Tjernberg, Phys. Rev. B 87, 115106 (2013). I Synchrotron Radiation in Natural Science Vol. 12, No. 1 – 2 (2013) CONTENTS B.J. Kowalski, R. Buczko, and T. Story Pb1-xSnxSe topological crystalline insulator: I a new kind of quantum material Contents II E. Pławski , J. Sekutowicz, W. Grabowski, Polish in-kind contribution to European X-ray Free Electron 1 K. Kosiński, J. Lorkiewicz, M. Wojciechowski, Laser (XFEL): Status in spring 2013 Z. Gołębiewski, K. Meissner, G. Wrochna, O. Chołuj-Dziewiecka, P. Borowiec, M. Duda, M. Jeżabek, K. Kasprzak, A. Kotarba, K. Krzysik, M. Stodulski, J. Świerblewski, M. Wiencek, M. Chorowski, E. Rusiński, J. Fydrych, A. Iluk, K. Malcher, J. Poliński, P. Duda, J. Głowinkowski, P. Wilk, M. Winkowski, P. Grzegory, and G. Michalski R. Mroczka Investigation of performance of x-ray capillaries internally 6 covered with a lacquer-metal reflectivity layer P. Romanowski, J. Bak-Misiuk, K. Sobczak, Strain state in Mn-implanted silicon annealed at high 10 R. Jakiela, and A. Misiuk temperature H. Oyanagi, A. Kisiel, W. Rypniewski, SOLARIS: Bright light at the end of the tunnel. 13 C. Bocchetta, and M. Stankiewicz Keep your fingers crossed! Synchrotron Light News 19 KSUPS-10 10th National Meeting of Synchrotron Radiation Users (KSUPS-10) Welcome 22 KSUPS-10 programme 24 KSUPS-10 Abstracts of invited lectures and oral presentations C. Carlile Progress on the world-leading X-ray and neutron facilities, L-01 26 MAX IV and ESS, being constructed on Poland's doorstep M. Majdan, E. Grabias, and A. Gładysz-Płaska XPS spectra of uranium (VI) adsorbed on red clay O-02 27 J. Kubacki, D. Kajewski, J. Szade, Investigation of the electronic states of FeTiO3 by X-ray L-02 27 and K. Schulte photoemission, X-ray absorption and Auger electron spectroscopy Z. Wroński Plasma–cathode interface of glow discharges as medium L-03 28 of particles activation for material spectrometry M. Zając, A. Bianco, C.J. Bocchetta, First beamline at Solaris L-04 29 E. Busetto, P. Goryl, J. Korecki, K. Kubal, F. Melka, M. Ostoja-Gajewski, M. Sikora, M.J. Stankiewicz, Ł. Walczak, A.I. Wawrzyniak, K. Wawrzyniak, and Ł. Żytniak J. Darul, A.D. Evans, and P. Piszora Three-dimensional strain distribution of lithium manganese L-05 29 spinels II Synchrotron Radiation in Natural Science Vol. 12, No. 1 – 2 (2013) A.I. Wawrzyniak, C.J. Bocchetta, Overview and current status of Solaris synchrotron light L-06 30 P. Borowiec, P. Bulira, P. Czernecki, source D. Einfeld, P.P. Goryl, K. Królas, K. Kubal, R. Nietubyć, M.P. Nowak, F. Melka, M. Ostoja-Gajewski, J. Potoczny, P. Tracz, M.J. Stankiewicz, P. Szostak, Ł. Walczak, K. Wawrzyniak, J. Wiechecki, M. Zając, T. Zawierucha, and Ł. Żytniak A. Andrejczuk X-ray refractive optics L-07 30 R. Mroczka Investigation of performance of x-ray L-08 31 capillaries with a lacquer-metal reflectivity layer R. Nietubyć and M. Johansson Integrated magnets of double bend achromat L-09 31 for Max IV 1.5 GeV and Solaris storage rings M.T. Klepka, A. Wolska, A. Drzewiecka, X-ray absorption spectroscopy – tool to resolve structure L-10 32 and K. Lawniczak-Jablonska K. Lawniczak- Jablonska, I.N. Demchenko, Complementary studies of the structural properties of highly L-11 33 E. Dynowska, A. Chruściel, and J. Janik disordered materials by x-ray absorption and diffraction D. Paliwoda and A. Katrusiak High-pressure diffraction studies at synchrotrons L-12 33 and in laboratories J.B. Pełka Synchrotron radiation in the study of biostructures and life L-13 34 processes: New achievements and challenges R. Nietubyć, W. Grabowski, R. Mirowski, Review of the ongoing efforts dedicated to Polish free L-14 34 J. Lorkiewicz, J. Sekutowicz, T. Wasiewicz, electron laser POLFEL and J. Witkowski M. Grzesiak-Nowak, A. Szymańska, XRPD structural studies of new group of coordination O-02 35 G. Appleby, and W. Łasocha polymers M. Oszajca and W. Łasocha Application of synchrotron data to PDF-based structure L-15 35 refinement K. Mazur, K. Wieteska, W. Wierzchowski, X-ray diffraction and topographic studies of silicon epitaxial L-16 36 J. Sarnecki, and C. Paulmann layers grown on the substrate with introduced porous silicon layer M. Kozak, M. Taube, F. Giska, M. Piechocki, Structure in solution of HopQ1 protein, type three effector L-17 36 R. Hoser, J. Hennig, and M. Krzymowska from Pseudomonas syringae W. Gospodarczyk and M. Kozak Influence of selected gemini surfactants and sulfobetaines O-03 37 on structure of BSA and lysozyme KSUPS -10 Abstracts of poster presentations W.J. Andrzejewska, Z. Pietralik, M. Taube, Studies of selected gemini surfactants complexes with DNA P-01 37 and M. Kozak and siRNA using biophysical methods K. Balin, J. Szade, M. Wojtyniak, Influence of segregation of divalent europium on magnetic P-02 38 D. Wilgocka-Ślęzak, T. Giela, J. Korecki, and transport properties of MBE grown Eu-Fe thin films M. Ślęzak, and Z. Celinski A. Behrooz, W. Paszkowicz, Structural properties of Ca9R(VO4)7 (R = La, Nd, Gd) single P-03 38 P. Romanowski, B. Nazarenko, crystals: An X-ray diffraction study and A. Shekhovtsov K. Bilewska, M. Wojtyniak, K. Balin, Structure of magnetron sputtered SmNiO3 thin films P-04 39 J. Szade, and P. Ruello III Synchrotron Radiation in Natural Science Vol. 12, No. 1 – 2 (2013) A. Drzewiecka, A. Wolska, M.T. Klepka, Electrochemical synthesis and structural studies of zinc P-05 39 Z. Komosa, A.E. Koziol, and M. Struga complexes with benzofuran derivatives E. Dynowska, A. Chrusciel, K. Lawniczak- Phase transitions in double metal cyanide catalysts P-06 40 Jablonska, I.N. Demchenko, J. Janik, and B. Sacher-Majewska S. Haracz, J. Rybka, M.