Neutron Scattering - JUWEL - Forschungszentrum Jülich

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DNS 5 Monochromator horizontal- and vertically PG(002), d = 3.355 � adjustable double-focusing (at NL6a) crystal dimensions 2.5 � 2.5 cm 2 (5 � 7 crystals) wavelengths 2.4 � � � � 6 � Double-chopper chopper frequency � 300 Hz system repetition rate � 900 Hz chopper disks Titanium, 3 slits, � = 420 mm Expected flux at sample (n/cm 2 Non-polarized ~ 10 s) 8 Polarized (polarizer: m = 3 supermirror benders) ~ 5�10 6 –10 7 Detector banks for position sensitive non-polarized neutrons 3 He detector 128 units, � = 1.27 cm, height tubes ~100 cm total solid angle covered 1.9 sr covered scattering angles in the horizontal plane 0� < 2� � 135�� Detector banks for polarization analyzers 24 units, m = 3 supermirror polarized neutrons 3 He detector tubes 24 units, � = 2.54 cm, height 15 cm covered scattering angles in the horizontal plane 0� < 2� � 150�� Qmax �i = 2.4 � (Ei = 14.2 meV) 4.84 � -1 �i = 6 � (Ei = 2.28 meV) 1.93 � -1 Expected energy resolution Suitable samples single crystals, powders, soft matters (e.g. polymer, liquid etc.) Sample top-loading CCR, closed-cycle cold head, orange cryostat, cryo- environments furnace, 3 He/ 4 He dilution cryostat (~20mK), cryomagnet (selfshielding, vertical field up to 5T) �i = 2.4 � (Ei = 14.2 meV) ~ 1 meV �i = 6 � (Ei = 2.28 meV) ~ 0.1 meV Table 1 The technical details of the DNS instrument Typical scientific applications at DNS are the studies of complex magnetic correlations, such as in highly frustrated magnets and strongly correlated electrons, as well as the structures of soft condensed matter systems, such as the nanoscale confined polymers and proteins, via polarization analysis. The exploration of unusual magnetic properties can also be efficiently undertaken on single-crystal samples by reciprocal space mapping. Fig. 2(a) shows an example of the measured magnetic diffuse scattering patterns in frustrated spin-ice pyrochlore compound (Ho1-xYx)2Ti2O7, due to in-plane magnetic correlations as determined by the spinflip scattering of the initial Pz polarization [8]. In addition to the separation of magnetic cross section from nuclear and spin-incoherent ones, polarization analysis can also be used to explore possible anisotropy of spin correlations in complex materials. Polarized powder diffraction carried out at DNS is complementary to standard neutron powder diffraction and may be extremely useful for magnetic structure refinements, particularly in case of small magnetic moments by improving the signal to background ratio. Fig. 2(b) shows the magnetic and nuclear scattering of iron-based superconductor Sr2CrO3FeAs measured at DNS via polarization analysis and the corresponding Rietveld refinements [9]. Fig. 2(c) shows the magnetic diffuse scattering derived with the same approach on the {Mo72Fe30} molecule magnet [10]. DNS also represents a powerful instrument for the soft condensed matter
6 Y. Su community for the separation of nuclear coherent scattering from often dominating spin incoherent scattering background in hydrogenous materials. (b) � (a) Fig. 2 Examples of the scientific applications at DNS: (a) peculiar magnetic diffuse scattering patterns observed on the frustrated spin-ice pyrochlore compound (Ho1-xYx)2Ti2O7 via polarization analysis [8]; (b) magnetic and nuclear scattering of iron-based superconductor Sr2CrO3FeAs at 3.5 K as measured (blue) at DNS via polarization analysis and the Rietveld refinements (red) [9]; (c) differential magnetic scattering cross section measured at 1.5 K and the theoretical simulation with the three-sublattice spin model of the {Mo72Fe30} molecule magnet [10]. (c)
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Member of the Helmholtz Association
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Forschungszentrum Jülich GmbH Jül
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�� 1 PUMA
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2 O. Sobolev, A. Teichert, N. Jünk
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10 O. Sobolev, A. Teichert, N. Jün
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2 POWDER DIFFRACTOMETER SPODI Conte
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Page 78 and 79: SPHERES Backscattering spectrometer
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Page 88 and 89: SPHERES 11 The stationary equilibri
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Page 92 and 93: ________________________ DNS Neutro
Page 94 and 95: DNS 3 1 Introduction Polarized neut
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Page 140 and 141: RESEDA 3 1 Introduction Neutrons ar
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RESEDA 9 spin flip from up to down
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RESEDA 11 The neutrons are counted
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RESEDA 13 Contact ��
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Neutron Scattering - JUWEL - Forschungszentrum Jülich

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