Magnetostructural transition in Gd5Sb0.5Ge3.5

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2009-11-17
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Lograsso, Thomas
Chernyshov, A.
Schlagel, Deborah
Mudryk, Yaroslav
Paudyal, Durga
Pecharsky, Vitalij
Gschneidner, Karl
Schlagel, Deborah
Lograsso, Thomas
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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.

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

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