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Magnetostructural transition in Gd5Sb0.5Ge3.5
Physical Review B
  • A. S. Chernyshov, Iowa State University
  • Yaroslav Mudryk, Iowa State University
  • Durga Paudyal,
  • 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
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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.

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

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American Physical Society
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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
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