This title appears in the Scientific Report :
2001
Please use the identifier:
http://dx.doi.org/10.1007/s100510170293 in citations.
Antiferromagnetic order and phase transitions in GdS as studied with X-ray resonance-exchange scattering
Antiferromagnetic order and phase transitions in GdS as studied with X-ray resonance-exchange scattering
We report on X-ray resonance exchange and neutron scattering of metallic GdS. At the L-II and L-III absorption edges of Gd, resonance enhancements of more than two orders of magnitude over the non-resonant magnetic scattering: are observed. Polarisation analysis proves that these enhancements are du...
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Personal Name(s): | Brückel, T. |
---|---|
Hupfeld, D. / Strempfer, J. / Caliebe, J. D. / Mattenberger, K. / Stunault, N. V. / Bernhoeft, N. / McIntyre, G. J. | |
Contributing Institute: |
Streumethoden; IFF-STM |
Published in: | The @European physical journal / B, 19 (2001) S. 475 - 490 |
Imprint: |
Berlin
Springer
2001
|
Physical Description: |
475 - 490 |
DOI: |
10.1007/s100510170293 |
Document Type: |
Journal Article |
Research Program: |
Methodenentwicklung für Synchrotron- und Neutronenstrahlung |
Series Title: |
European Physical Journal B
19 |
Subject (ZB): | |
Publikationsportal JuSER |
We report on X-ray resonance exchange and neutron scattering of metallic GdS. At the L-II and L-III absorption edges of Gd, resonance enhancements of more than two orders of magnitude over the non-resonant magnetic scattering: are observed. Polarisation analysis proves that these enhancements are due to dipolar transitions from the 2p to the 5d states. The branching ratio between the L-II and L-III edges of 2.5 suggests a polarisation of the 5d electrons in the ground state. The antiferromagnetic order is of type II in the fcc lattice. Single crystal diffraction of hot neutrons suggests that the spin direction lies within the (111) planes with a value for the sublattice magnetisation of 6.51(3) mu (B). The critical exponent for the sublattice magnetisation has a value of beta = 0.38(2) in agrement with a pure Heisenberg model. Above TN, a sharp component persists ill the critical diffuse scattering. Lattice distortions give indications for two additional low-temperature phase transitions at about 49 K and 32 K. We argue that these transitions are not connected to spin reorientations and discuss the possible influence of fourth-order exchange interactions. |