Magnetic-Field-induced Antiferromagnetism in Two-dimensional Hubbard Model: Analysis of CeRhIn5
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- Sakurazawa Keitaro
- Department of Physics, Saitama University
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- Kontani Hiroshi
- Department of Physics, Nagoya University
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- Saso Tetsuro
- Department of Physics, Saitama University
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Abstract
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 TN, with the AF order perpendicular to B. The increment of TN 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 TN in CeRhIn5 under the magnetic field found recently. We will also discuss a relation to some organic metals.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 74 (1), 271-274, 2005
THE PHYSICAL SOCIETY OF JAPAN
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Details
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- CRID
- 1390001204187171712
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- NII Article ID
- 210000105682
- 110001979365
- 130004538961
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- NII Book ID
- AA00704814
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- BIBCODE
- 2005JPSJ...74..271S
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7218229
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed