Document Type

Article

Publication Date

11-17-2009

Journal or Book Title

Physical Review B

Volume

80

Issue

18

First Page

184416

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

File Format

application/pdf

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