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초록· 키워드
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Itinerant weak ferromagnetism is investigated phenomenologically by introducing the hm³ term in the Landau-like free energy. As an example, we explain the magnetic behaviors of the typical itinerant weak ferromagnet ZrZn₂. Other itinerant weak ferromagnetic materials are also discussed. In addition, we introduce a nonlinear term m⁴ logm in the free energy to consider the pressure effect. This term is due to the non-Fermi liquid effect proposed by Belitz-Kirkpatrick-Vojta. By determining the model parameters empirically, the zero-temperature and zero-field magnetic susceptibility χ<SUB>h=0</SUB>(0) is calculated under the two hypotheses for ZrZn₂.
목차
I. INTRODUCTION
II. PHENOMENOLOGICAL FREE ENERGY
III. EXAMPLE - ZrZn₂ UNDER AMBIENT PRESSURE
IV. PRESSURE EFFECT FOR ZrZn₂
REFERENCES
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