Phenomenological Mean-Field Theory of Metamagnetism in Heavy Fermions

Kazuyuki Matsumoto; Shigeyuki Murayama

doi:10.4028/www.scientific.net/SSP.289.179

Paper Titles

⁷⁵As NMR Studies of Magnetic Properties of the Magnetic Superconductor CaK(Fe_0.967Ni_0.033)₄As₄
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Magnetic Order in Quaternary NiMnGe:T (T = Cr, Ti) Compounds
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Magnetic Study on Y₂M₃Co₉P₇ (M: Transition Metals) with Cation-Ordered Zr₂Fe₁₂P₇-Type Structure
p.164

Magnetic, Magnetocaloric and Magnetoresonance Properties of (1-x)La_0.7Sr_0.3MnO₃/xGeO₂ (x=0, 0.15)
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Phenomenological Mean-Field Theory of Metamagnetism in Heavy Fermions
p.179

The Spin-Disorder Resistivity: The Disordered Local Moment Approach
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Longitudinal Spin Fluctuations and Magnetic Ordering Temperature in Metals: First-Principle Modeling and Phase Space Integration Measure
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Magnetic Phase Transition in MnSi Based on the First Principle Calculations of Electronic Structure and Spin Fluctuation Theory
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DFT Calculations to Study Hydrogen Localization and Diffusion in Disordered Bcc Ti-V-Cr Alloys
p.205

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Phenomenological Mean-Field Theory of Metamagnetism in Heavy Fermions

Abstract:

Metamagnetism observed in some heavy fermion compounds is an intriguing phenomena. To understand this phenomena, we explore the phenomenological mean-field theory for heavy fermion systems without microscopic mechanism. We write an extension of the Landau-like free energy density with the Bragg-Williams entropy. By minimising this free energy density with respect to the sub-lattice magnetizations, we can obtain thermal equilibrium quantities. As examples, the magnetic behaviors of CeRu₂ Si₂(the metamagnetism with crossover) and CeTiGe (the first order metamagnetism) are explained qualitatively, where the scaling hypothesis is used to consult with experimental data under the constant pressure condition.

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Solid State Phenomena (Volume 289)

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179-184

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https://doi.org/10.4028/www.scientific.net/SSP.289.179

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April 2019

Authors:

Kazuyuki Matsumoto*, Shigeyuki Murayama

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Heavy Fermions, Metamagnetism

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