The new HMI beamline MAGS: an instrument for hard X-ray diffraction at BESSY

Dudzik, E.; Feyerherm, R.; Diete, W.; Signorato, Riccardo; Zilkens, Christopher

doi:10.1107/s0909049506032559

Cited by 34 publications

(29 citation statements)

References 7 publications

(7 reference statements)

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“…24 Single crystal x-ray magnetic resonant scattering (XRMS) on TbMn 1−x Ga x O 3 were conducted at the 7 T multipole wiggler beamline MAGS, also HZB. 16,25 Physical characterization of the samples was performed on both single crystal and polycrystalline samples. The single crystals were aligned along their principal direction by x-ray Laue diffraction and cut in orthorhombic shapes with each face normal (within 2 • ) to a principal crystallographic direction.…”

Section: Methodsmentioning

confidence: 99%

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

et al. 2010

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Ga for Mn substitution in multiferroic TbMnO3 has been performed in order to study the influence of Mn-magnetic ordering on the Tb-magnetic sublattice. Complete characterization of TbMn1−xGaxO3 (x = 0, 0.04, 0.1) samples, including magnetization, impedance spectroscopy, and x-ray resonant scattering and neutron diffraction on powder and single crystals has been carried out. We found that keeping the same crystal structure for all compositions, Ga for Mn substitution leads to the linear decrease of T Mn N and τ Mn , reflecting the reduction of the exchange interactions strength JMn−Mn and the change of the Mn-O-Mn bond angles. At the same time, a strong suppression of both the induced and the separate Tb-magnetic ordering has been observed. This behavior unambiguously prove that the exchange fields J Mn−Tb have a strong influence on the Tb-magnetic ordering in the full temperature range below T Mn N and actually stabilize the Tb-magnetic ground state.

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Section: Methodsmentioning

confidence: 99%

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

et al. 2010

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“…Anomalous XRD experiments at ambient temperature were carried out at the MAGS beamline 17 at the Berlin synchrotron radiation source BESSY. The samples were mixed with Corundum ͑Al 2 O 3 ͒ reference powder 15 and placed into evacuated fused silica capillaries with a diameter of 500 m. Coarse-grain effects were avoided by sample rotation.…”

Section: B Neutron and Anomalous X-ray Powder Diffractionmentioning

confidence: 99%

Long-range structure of Cu(InxGa1−x)3Se5: A complementary neutron and anomalous x-ray diffraction study

Lehmann

Marrón

León

et al. 2011

Journal of Applied Physics

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Distinguishing the scattering contributions of isoelectronic atomic species by means of conventional x-ray-and/or electron diffraction techniques is a difficult task. Such a problem occurs when determining the crystal structure of compounds containing different types of atoms with equal number of electrons. We propose a new structural model of Cu͑In x Ga 1−x ͒ 3 Se 5 which is valid for the entire compositional range of the CuIn 3 Se 5 -CuGa 3 Se 5 solid solution. Our model is based on neutron and anomalous x-ray diffraction experiments. These complementary techniques allow the separation of scattering contributions of the isoelectronic species Cu + and Ga 3+ , contributing nearly identically in monoenergetic x-ray diffraction experiments. We have found that CuIII 3 Se 5 ͑III =In,Ga͒ in its room temperature near-equilibrium modification exhibits a modified stannite structure ͑space group I42m͒. Different occupation factors of the species involved, Cu + , In 3+ , Ga 3+ , and vacancies have been found at three different cationic positions of the structure ͑Wyckoff sites 2a, 2b, and 4d͒ depending on the composition of the compound. Significantly, Cu + does not occupy the 2b site for the In-free compound, but does for the In-containing case. Structural parameters, including lattice constants, tetragonal distortions, and occupation factors are given for samples covering the entire range of the CuIn 3 Se 5 -CuGa 3 Se 5 solid solution. At the light of the result, the denotation of Cu-poor 1:3:5 compounds as chalcopyrite-related materials is only valid in reference to their composition.

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“…22 Spectra were collected in beamlines MAGS (Pr L 3 edge) and PM3 (Pr M 4,5 and Ca L 2,3 edges) by means of bulk-sensitive fluorescence yield (FY) and surface-sensitive total electron yield (TEY). MAGS beamline provides a focused beam in the energy range 4-30 keV, monochromatized by a Si (111) double-crystal monochromator, with a photon flux of the order of 10 12 photons/s at 10 keV.…”

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confidence: 99%

Valence change of praseodymium in Pr0.5Ca0.5CoO3investigated by

et al. 2011

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X-ray absorption spectroscopy measurements in Pr 0.5 Ca 0.5 CoO 3 were performed at the Pr M 4,5 , Pr L 3 , and Ca L 2,3 absorption edges as a function of temperature below 300 K. Ca spectra show no changes down to 10 K while a noticeable thermally dependent evolution takes place at the Pr edges across the metal-insulator transition. Spectral changes are analyzed by different methods, including multiple scattering simulations, which provide quantitative details on an electron loss at Pr 4f orbitals. We conclude that in the insulating phase a fraction [15(±5)%] of Pr 3+ undergoes a further oxidation to adopt a hybridized configuration composed of an admixture of atomiclike 4f 1 states (Pr 4+ ) and f-symmetry states on the O 2p valence band (Pr 3+ L states) indicative of a strong 4f-2p interaction.

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The new HMI beamline MAGS: an instrument for hard X-ray diffraction at BESSY

Cited by 34 publications

References 7 publications

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

Long-range structure of Cu(InxGa1−x)3Se5: A complementary neutron and anomalous x-ray diffraction study

Valence change of praseodymium in Pr0.5Ca0.5CoO3investigated by

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