Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-26
J. Phys. Soc. Jpn. 74 (2005) p271
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages
Scientific paper
10.1143/JPSJ.74.271
We propose the mechanism for the magnetic-field-induced antiferromagnetic (AFM) state in a two-dimensional Hubbard model in the vicinity of the AFM 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 AFM 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 AFM order perpendicular to $B$. The increment in $T_N$ 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 in $T_N$ in CeRhIn_5 under the magnetic field found recently.
Kontani Hiroshi
Sakurazawa Keitaro
Saso Tetsuro
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