Magnetostructural transition in Gd5Sb0.5Ge3.5Physical Review B
AbstractMagnetic 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.
Copyright OwnerAmerican Physical Society
Citation InformationA. 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
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