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Article
Magnetostructural transition in Gd5Sb0.5Ge3.5
Physical Review B
  • A. S. Chernyshov, Iowa State University
  • Yaroslav Mudryk, Iowa State University
  • Durga Paudyal, dpaudyal@iastate.edu
  • Vitalij K. Pecharsky, Iowa State University
  • Karl A. Gschneidner, Jr., Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • Thomas A. Lograsso, Iowa State University
Document Type
Article
Publication Date
11-17-2009
DOI
10.1103/PhysRevB.80.184416
Abstract

Magnetic and crystallographic properties of Gd5Sb0.5Ge3.5 were investigated using dc magnetization, ac magnetic susceptibility, and heat capacity of an oriented single crystal, combined with temperature and magnetic field dependent x-ray powder diffraction. The compound undergoes an unusual magnetostructural transition at 40 K and a nonmagnetic second-order transition around 63 K. The detailed crystallographic study of Gd5Sb0.5Ge3.5 shows that contrary to the R5(SixGe1−x)4 systems (R is a rare-earth metal), the structural transition occurs without shear displacements of the ∞2[R5T4] slabs (T=Si, Ge, and Sb), and a substantial volume change (−0.5%) does not lead to a change in crystallographic symmetry. The first-principles electronic structure calculations show higher interslab than intraslab ferromagnetic exchange interaction indicating that Sm5Ge4 type of structure supports a ferromagnetic ground state in Gd5Sb0.5Ge3.5.

Comments

This article is from Physical Review B 80, no. 18 (2009): 184416, doi:10.1103/PhysRevB.80.184416.

Copyright Owner
American Physical Society
Language
en
Date Available
2013-09-21
File Format
application/pdf
Citation Information
A. S. Chernyshov, Yaroslav Mudryk, Durga Paudyal, Vitalij K. Pecharsky, et al.. "Magnetostructural transition in Gd5Sb0.5Ge3.5" Physical Review B Vol. 80 Iss. 18 (2009) p. 184416
Available at: http://works.bepress.com/thomas_lograsso/59/