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|Type:||Artigo de periódico|
|Title:||Magnetic Structure And Enhanced Tn Of The Rare-earth Intermetallic Compound Tbrh In5: Experiments And Mean-field Model|
Mendonca Ferreira L.
|Abstract:||In this work the physical properties of the intermetallic compound TbRh In5 were investigated by means of temperature-dependent magnetic susceptibility, electrical resistivity, heat-capacity, and resonant x-ray magnetic diffraction experiments. TbRh In5 is an intermetallic compound that orders antiferromagnetically at TN =45.5 K, the highest ordering temperature among the existing RRh In5 (1-1-5, R=rare earth) materials, which in contrast to what is expected from a de Gennes scaling along the RRh In5 series. The x-ray resonant diffraction data have allowed us to solve the magnetic structure of TbRh In5. Below TN, we found a commensurate antiferromagnetic structure with a propagation vector (12,0,12) and the Tb moments oriented along the c axis. Strong (over two orders of magnitude) dipolar enhancements of the magnetic Bragg peaks were observed at both Tb absorption edges LII and LIII, indicating a fairly high polarization of the Tb 5d levels. Using a mean-field model including an isotropic first-neighbor exchange interaction (JR-R) and the tetragonal crystalline electrical field (CEF), we evaluate the influence of the CEF effects in the physical properties of TbRh In5. The results reported here seem to corroborate a general trend of CEF-driven effects on TN along the RRh In5 series. © 2006 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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