Magnetization Process of the Heisenberg Spin System on the F.C.C. Lattice with Second-Neighbor Interaction

概要

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By making use of the statistical-mechanical calculation based upon the method of expansion into inverse-temperature power series, magnetic properties of the Heisenberg spin system (S=1/2) with the first- and second-neighbor exchange interactions, J_1(>0) and J_2(<0), are investigated more extensively than in the previous paper. It is shown that the system exhibits more various magnetic properties depending on the exchange ratio α=J_2/J_1; that is, it exhibits, in the order of decreasing α, a usual ferromagnetism, ferromagnetism accompanied with a type of metamagnetism which is named "exchange-compensated paramagnetism", a sole exchange-compensated paramagnetism and antiferromagnetism, the last of which is of no concern in the present paper. These properties have been significantly recognized in the observation on the compound series, Co(S_xSe_<1-x>)_2.
社団法人日本物理学会の論文
1973-10-05