Magnetic properties, phase stability, electronic structure, and half-metallicity of L 2 1 -type Co 2 ( V 1 − x Mn x ) Ga Heusler alloys

摘要: Magnetic properties, phase stability, electronic structure, and spin polarization ratio of $L{2}_{1}$-type in ${\mathrm{Co}}_{2}({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x})\mathrm{Ga}$ Heusler alloys have been investigated experimentally theoretically. The experimental magnetic moments ${M}_{s}$ at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ linearly increase with increasing $x$, situ the generalized Slater-Pauling rule. Curie temperature ${T}_{C}^{\mathrm{expt.}}$ exhibits a maximum value about $704\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ $x=0.75$. latter behavior is comparable to calculated ${T}_{C}^{\mathrm{calc.}}$ from theoretical effective exchange constant ${J}_{0}$. Although order-disorder transition ${T}_{t}^{L{2}_{1}∕B2}$ $L{2}_{1}$- $B2$-type decreases it relatively high enough entire concentration region. means that can exist stably, which very important for practical uses. density states by linear-muffitin orbital method atomic sphere approximation disclosed $P$ alloy $x=0.75$ highest present substituted alloys.