MnF₂の低温の理論

抄録

Taking into account two reasonable different exchange interactions of MnF₂, the stability of spin wave and its dispersion relation are studied. The introduction of exchange interaction between two neighbouring spins which belong to the same sublattice gives some modulations on the thermodynamic quantities obtained from standard spin wave theory for the temperature dependence and the other of magnitude. The calculations of the magnetization, parallel susceptibility and specific heat show better agreement with experiments than simple calculation.