A thermodynamic framework for a system with itinerant-electron magnetism


Thermodynamic fluctuation among many electronic states in systems with ‘itinerant-electron’ magnetism is addressed with a first-principles formulation of the Helmholtz energy. The Ce γ –α phase transition is used as an illustrative case. The kB ln(2J + 1) form for the magnetic entropy that is commonly found in the literature is replaced with an expression that is derived from configurational fluctuations among nonmagnetic, ferromagnetic, and antiferromagnetic electronic states. Predicted firstand second-order magnetic phase transitions are in close accord with experiment. The mixture of states leads to a Schottky anomaly in the Ce specific heat. (Some figures in this article are in colour only in the electronic version)

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@inproceedings{Wang2009ATF, title={A thermodynamic framework for a system with itinerant-electron magnetism}, author={Yanping Wang and Louis G. Hector and Huiyuan Zhang and Shun-Li Shang and L. Q. Chen and Z K Liu}, year={2009} }