Temperature- and Field-Induced First-Order Ferromagnetic Transitions in MnFe(P_<1-x>Ge_x)(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

論文の詳細を見る
We have found that the hexagonal ZrNiAl-type compounds MnFe(P_<1-x>Ge_x) with x=0.15 and 0.17 show temperature- and field-induced first-order paramagnetic-to-ferromagnetic transitions with remarkable hysteresis loops at T_C≃250K. The hysteresis widths in both temperature and field are much larger than those for a similar system of MnFe(P, As). On cooling below T_C, the hexagonal lattice of MnFe(P<1-x>Ge_x) contracts by 1.5% along the a-axis and elongates by 2.8% along the c-axis, keeping the crystal symmetry unchanged. The very small volume expansion of less than 0.1% suggests that the firstorder transition is related to the anisotropic lattice distortion rather than the volume change.
社団法人日本物理学会の論文
2006-11-15