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Annual Report 2012

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Annual Report 2012 Content Directors’ Report 4 Directors’ Report: Growing Cooperation 7 The year in pictures 8 Instruments & Methods 12 New instruments, user facilities & opportunities 14 Towards the European Spallation Source ESS 24 Improving service, infrastructure and components 26 Scientific Highlights 34 Quantum Phenomena Higgs transition in quantum spin ice Yb2Ti2O7 36 Long-wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3 38 Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets 40 Simultaneous uniform and non-uniform reversal of magnetization in exchange coupled systems 42 Instability of the magnetic order in the distorted triangular lattice antiferromagnet a-CaCr2O4 44 Roton-Phonon interactions in superfluid4 He 46 Bond randomness induced magnon decoherence in a spin-1/2 ladder compound 48 Depth profiles of LSMO/SRO films 50 Competition between crystal electrical field shift and Kondo screening in CeNi9Ge4−xSix 52 Direct manipulation of the uncompensated spins in an exchange coupled system 54 Soft Matter Proteins need it wet. Don‘t they ? 56 Structure and dynamics of the iron-binding protein Lactoferrin studied using neutron scattering 58 Thermal fluctuations of haemoglobin from different species 60 Changes in structure and dynamics of beta-casein protein during micellization process 62 Effect of confinement on the dynamics of polymer melts: interfaces and interphases 64 SANS study of the morphology of a novel polymer electrolyte membrane 66 Time-resolved SANS studies on the crystalline complexes of syndiotactic-polystyrene 68 Small angle neutron scattering studieson self-healing model polymers 70 Lipase-induced changes in fundamental surfactant monolayer properties 72 Depth-dependent morphology investigation of diblock copolymer films using TOF-GISANS 74 The influence of processing additives on the morphology of bulk heterojunction films 76 Polyelectrolyte brushes: Swelling in water and incorporation of nanoparticles 78 Influence of diffusion and dipping time on the inner structure of polyelectrolyte multilayers 80 Neutron reflectometry reveals an asymmetric distribution of anionic phospholipids on SiO2 82 Directors’ Report: Growing Cooperation Research using neutrons makes essential and a reflectometer for the first time. We expect to unique contributions to the major challenges observe new effects such as non-collinear mag- Directors’ Report Directors’ facing our society. Yet again in 2012, there had netism at the surface, different orderings at the been a large number of impressive scientific surface and perhaps even some new physics. 6 / 7 publications resulting from research conducted Major progress can also be reported from the at our Forschungs-Neutronenquelle Heinz Maier- new neutron guide hall east: The new multi anvil Leibnitz (FRM II). The highlights are presented in press SAPHiR of the Bayerisches Geoinstitut, this Annual Report. University of Bayreuth, was delivered and put into operation. SAPHiR is expected to realize The cooperation between the Technische Uni- pressures up to 25 GPa with sample tempera- versität München (TUM), Forschungszentrum tures of 2000 °C. Thus, it allows the study of Jülich (FZJ), Helmholtz-Zentrum Berlin (HZB) matter under the extreme condition of the tran- and Helmholtz-Zentrum Geesthacht (HZG), sition zone between the upper and lower earth which began in 2011, was extended successfully mantle. in 2012. To merge the know-how and to further Furthermore, great steps towards the imple- exploit synergies, joint scientific groups have mentation of high precision experiments with been founded covering five important fields of ultra-cold neutrons have been made: An ambi- neutron research: Materials Science, Soft Matter, ent magnetic field compensation coil system Quantum Phenomena, Structure Research as and a passive metal shield were built and com- well as Neutron Methods. However, due to finan- missioned at the beam position, achieving the cial constraints, HZB has withdrawn active sup- world’s lowest residual magnetic field. Gratify- port for the moment, but is still a silent partner. ingly, in the Excellence Initiative’s 2nd Round in Therefore, the three axes spectrometer PANDA 2012, the excellence cluster “Structure and Origin has been taken over by FZJ. of the Universe” is to be continued until 2017. The competence and experience of the coopera- We shall not disguise the fact that, due to the tion is reflected in particular in the development 14C-issue, we were not able to provide our users of new and innovative neutron instruments and with a full schedule of four reactor cycles in 2012. techniques: The small angle neutron scattering Also, there was a longer maintenance break at instrument SANS-1 had neutrons on the detec- neutron guides 5 and 6. Therefore, some users tor for the first time in 2012. Being a joint venture were not able to perform experiments at the in- between TUM and HZG, SANS-1 will comple- struments SPHERES, RESEDA, MARIA, MIRA ment the already operating set of small angle and DNS. cameras KWS-1 to -3 and aimes to be one of the most intense and versatile instruments world- In 2013, the scientific cooperation will enter a wide in its field. It is optimized for investigations new era: It is going to operate under the new on materials science and magnetism covering name Heinz Maier-Leibnitz Zentrum (MLZ), em- basic research and industrial applications. phasizing that the scientific use of the FRM II The newly inaugurated polarized reflectometer constitutes a national cooperative research MARIA (FZJ) focuses on magnetism and is dedi- centre financed by the Federal Ministry of Edu- cated to the investigation of thin layers, interfac- cation and Research and the Bavarian State. es and nano-structured samples. The latter case is particularly interesting because here the spin We look forward to a full schedule of four reactor diffusion length of electrons in metals and oxides cycles and to exciting new scientific findings in is on the same length scale, to be probed with 2013. Klaus Seebach Winfried Petry Dieter Richter Anton Kastenmüller Figure 6: a) An intensity gain up to 11 times on the sample compared to the conventional pinhole mode when focusing lenses are used, keeping the resolution. b) Measurements at KWS-2 with variable resolution on polystyrene latex particles & Methods (samples – courtesy of M.Hellsing and A.Rennie, Uppsala University) and silver behenate; the green lines indicate the fit, Instruments including instrumental resolution. c) Scattering patterns from silica and polystyrene particles in solution measured in the pinhole and high-resolution (focusing lenses) modes. The fits include the form factor and the structure factor of the particles and the instrumental resolution. 16 / 17 for better measurement planning has also been compared to the conventional pinhole mode developed and can be used in parallel with the for the same resolution can be achieved by instrument control software. increasing the sample size (up to 5 cm in di- ameter); A first test, and simultaneously a benchmark, for • the tuning of the resolution Δλ/λ between the MIRA three axes option was performed with a 2 % and 20 % will allow for an improved 1 cm3 lead sample. The result is shown in figure 5 characterization of the scattering features and demonstrates the excellent performance of within different Q ranges (fig. 6b) using the the three axes option of MIRA. Using the focus- chopper and the time-of-flight method; ing guides on a small sample will further improve • the high-resolution/extended Q-range mode the peak to background ratio, thereby allowing down to 1 ∙ 10-4 Å-1 by means of the lenses for inelastic measurements with high intensity in (fig. 6c), used in combination with the chop- pressure cells or on small samples. per to narrow the Δλ/λ and minimize the chromatic aberrations and gravity effects Lenses, chopper and a new detector: boosting and the high resolution detector, will enable performance at KWS-2 exploration of sizes over a continuous length KWS-2 was the subject of a major upgrade scale from 1 nm to 1 micron. aimed at boosting its performance with respect to the three most important parameters of a Extended scientific opportunities at RESEDA small angle scattering instrument: intensity on A pilot neutron Larmor diffraction experiment the sample, Q-range and resolution. Thus, the in- strument was equipped with focusing elements (MgF2 parabolic lenses), a double-disc chopper with variable slit opening and a high-resolution position-sensitive detector (0.45 mm). Besides the conventional pinhole measurement mode, the following setups were tested and optimized throughout the year 2012 in order to have the instrument up and running in 2013 and increase their flexibility and versatility: • the high-intensity mode with lenses – an intensity gain of up to 11 times (fig. 6a) as Figure 7: Exterior view of a new radiofrequency spin flipper at RESEDA. come into play, the weight around the sample increases considerably. To use the new 350 kg 5 Tesla cryomagnet at the KWS-1, a new hexa- pod was installed (fig. 16). A special adapter was constructed to hold the magnet and to make use of the full adjustment options in the neutron beam. Now, it is possible to control the setup in different directions with a precision of reproduc- ibility as high as 10 µm. Installation and commis- sioning included fitting it into the instrument con- trol software and controlling it remotely. A user friendly graphical interface provides easy to use access to all options. SANS-1 commissioned and in operation The SANS-1 instrument, a joint project between HZG and FRM II, is now fully operational and available for user experiments. The very flexible collimation systems allow experimental setups optimized for both high flux and high resolu- tion experiments. The lateral movable detector combined with interchangeable beam-stops Figure 16: The compensated, vertical 5 Tesla cryomagnet allows the full Q-range to be covered with only with the new hexapod at KWS-1. two sample detector distances.
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