Magnetic-Field-induced Antiferromagnetism in Two-dimensional Hubbard Model : Analysis of CeRhIn_5(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• We propose a mechanism for the magnetic-field-induced antiferromagnetic (AF) state in a two-dimensional Hubbard model in the vicinity of the AF quantum critical point (QCP), using the fluctuation-exchange (FLEX) approximation by taking the Zeeman energy due to the magnetic field B into account. In the vicinity of the QCP, we find that the AF correlation perpendicular to B is enhanced, whereas that parallel to B is reduced. This fact means that the finite magnetic field increases T_N, with the AF order perpendicular to B. The increment of T_N can be understood in terms of the reduction of both quantum and thermal fluctuations due to the magnetic field, which is caused by the self-energy effect within the FLEX approximation. The present study naturally explains the increment of T_N in CeRhIn_5 under the magnetic field found recently. We will also discuss a relation to some organic metals.

• 社団法人日本物理学会の論文
• 2005-01-15

著者

• Saso Tetsuro

  Department Of Physics Saitama University

• Saso Tetsuro

  Department Of Physics Faculty Of Science Saitama University

• Sakurazawa Keitaro

  Department Of Physics Saitama University

• Kontani Hiroshi

  Department Of Physcis Kyoto University

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