Electronic and Magnetic Properties of X_2Mn_V_xSi (X=Fe and Co)

元データ 1994-05-15 社団法人日本物理学会

概要

We have performed energy-band calculations of X_2Mn_<1-x>V_xSi (X=Fe and Co) at x=0, 0.25, 0.5, 0.75, 1.0. In ferromagnetic ordering, we obtain excellent agreement between calculated and experimental data for the magnetic moment per formula unit and the lattice constant, at each Mn content. We have obtained the result that state densities in Fe_2Mn_<1-x>V_xSi have a large peak at the Fermi level, while they do not in Co_2 Mn_<1-x>V_xSi. We have also estimated Heisenberg exchange constants from total energy differences between ferromagnetic and antiferromagnetic orderings. The Curie temperature roughly calculated from the exchange constants increases from x=0 to x=0.5 and then decreases rapidly in Fe_2Mn_<1-x>V_xSi, though it monotonically decreases from x=0 to x=0.75 in Co_2 Mn_<1-x>V_xSi. The behavior of calculated Curie temperatures in Fe_2Mn_<1-x>V_xSi is consistent with the observed one.

著者

FUJII Shinpei Department of Physics, Faculty of Science, Kagoshima University
ISHIDA Shoji Department of Physics, Faculty of Science, Kagoshima University
ASANO Setsuro Institute of Physics, College of Arts and Sciences, University of Tokyo
Ishida Shoji Department Of Physics Faculty Of Science Kagoshima University
Fujii Shinpei Department Of Physics Faculty Of Science Kagoshima University
Asano Setsuro Institute For Solid State Physics The University Of Tokyo
Ishida Shuichi Division Of Cardiovascular Medicine Department Of Internal Medicine Ohmori Hospital Toho University
Fujii S Department Of Physics Faculty Of Science Kagoshima University

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