A thermodynamic framework for a system with itinerant-electron magnetism

Y. Wang; L. G. Hector; H. Zhang; S. L. Shang; L. Q. Chen; Z. K. Liu

doi:10.1088/0953-8984/21/32/326003

A thermodynamic framework for a system with itinerant-electron magnetism

Y. Wang, L. G. Hector, H. Zhang, S. L. Shang, L. Q. Chen, Z. K. Liu

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Abstract

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 k_Bln(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 first-and 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.

Original language	English (US)
Article number	326003
Journal	Journal of Physics Condensed Matter
Volume	21
Issue number	32
DOIs	https://doi.org/10.1088/0953-8984/21/32/326003
State	Published - 2009

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics

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10.1088/0953-8984/21/32/326003

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title = "A thermodynamic framework for a system with itinerant-electron magnetism",

abstract = "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 kBln(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 first-and 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.",

author = "Y. Wang and Hector, {L. G.} and H. Zhang and Shang, {S. L.} and Chen, {L. Q.} and Liu, {Z. K.}",

note = "Funding Information: This study was supported in part by DOT NHTSA Grant DTNH22-93-Y-17028, PHS CDC Grant R49CCR 507370, and the Department of Veterans Affairs Medical Center Research Service.",

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T1 - A thermodynamic framework for a system with itinerant-electron magnetism

AU - Wang, Y.

AU - Hector, L. G.

AU - Zhang, H.

AU - Shang, S. L.

AU - Chen, L. Q.

AU - Liu, Z. K.

N1 - Funding Information: This study was supported in part by DOT NHTSA Grant DTNH22-93-Y-17028, PHS CDC Grant R49CCR 507370, and the Department of Veterans Affairs Medical Center Research Service.

PY - 2009

Y1 - 2009

N2 - 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 kBln(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 first-and 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.

AB - 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 kBln(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 first-and 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.

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A thermodynamic framework for a system with itinerant-electron magnetism

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