Abstract
The pressure dependence of the critical temperature is discussed for ferromagnetic and antiferromagnetic metals. The single-site spin fluctuation theory developed by the present author using the functional integral method is extended to include the volume dependences of the band structure and of the electron-electron interaction due to applied pressure. Numerical calculations are performed for NiFe alloys, which account for anomalously large negative pressure effect on the Curie temperature in the NiFe Invar alloys. This effect is shown to arise from a considerable reduction of amplitude of local magnetic moments due to pressure. It is concluded that the Invar anomalies are due to non-rigid local moments whose amplitudes vary easily by changing external parameters such as the temperature and the pressure. The pressure dependence of the Néel temperature of antiferromagnetic metals is also discussed by using the present theory with the Bell shape model band.
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