Magnetostructural transition in Gd5Sb0.5Ge3.5
| Title | Magnetostructural transition in Gd5Sb0.5Ge3.5 |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Chernyshov AS, Mudryk Y, Paudyal D, Pecharsky VK, Gschneidner KA, Schlagel DL, Lograsso TA |
| Journal Title | Physical Review B |
| Volume | 80 |
| Pages | 184416 |
| Date Published | 11/01 |
| ISBN Number | 1098-0121 |
| Accession Number | ISI:000272310900074 |
| Keywords | ab initio calculations, antimony alloys, crystal symmetry, exchange interactions (electron), ferromagnetic materials, gadolinium alloys, germanium alloys, ground states, magnetic susceptibility, magnetic transitions, magnetisation, solid-state phase trans |
| 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 R-5(SixGe1-x)(4) systems (R is a rare-earth metal), the structural transition occurs without shear displacements of the (2)(infinity)[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. |
| URL | <Go to ISI>://000272310900074 |
| DOI | 10.1103/Physrevb.80.184416 |
