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No.4(pp.129-168)

Home > Issues > Volume 8 (2003) > No.4(pp.129-168)

Mossbauer Studies of Double Perovskite Sr₂Fe_1-xCr_xMoO₆

Journal of Magnetics, Volume 8, Number 4, 31 Dec 2003, Pages 129-132

Sung-Baek Kim(Department of Physics, Kookmin University), Hong-Joo Ryu(Department of Physics, Kookmin University), Je-Hoon Kim(Department of Physics, Kookmin University), Chul-Sung Kim*

(Department of Physics, Kookmin University)

Abstract

We investigated the crystallographic and magnetic properties of double perovskite Sr₂Fe_1-xCr_xMoO₆(x=0.0, 0.01, 0.03, 0.05, and 0.10). Mossbauer spectra of the Sr₂Fe_1-xCr_xMoO₆have been taken at various temperatures ranging from 15 to 415 K. As the temperature increased towards T_c(415 K), the Mossbauer spectra showed line broadening and 1, 6 and 3, 4 line-width differences because of anisotropic hyperfine field fluctuation. The Mossbauer spectra indicated that an anisotropic field fluctuation of +H ( P₊=0.85) was greater than that of -H (P_ =0.15). We also calculated the field fluctuation frequency factors and the temperature dependence of anisotropy energies from its relaxation rate. We interpreted the effect of Cr (t³_2g) doping as a decrease in the anisotropy energy.y.

Keywords: Mossbauer; Sr_2Fe_1-xCr_xMoO_6 ; Double perovskite

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