Magnetic-Field-induced Antiferromagnetism in Two-dimensional Hubbard Model : Analysis of CeRhIn_5

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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 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.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 74(1), 271-274, 2005-01-15

    The Physical Society of Japan (JPS)

References:  24

Cited by:  1

Codes

  • NII Article ID (NAID)
    110001979365
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    7218229
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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