Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-06-17
J. Phys. Soc. Jpn 72 (2003) 2445.
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 9 figures, to appear in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.72.2445
Interplay between the Mott transition and the multicritical phenomenon of d-wave superconductivity (SC) and antiferromagnetism (AF) is studied theoretically. We describe the Mott transition, which is analogous to a liquid-gas phase transition, in terms of an Ising-type order parameter $\eta$. We reveal possible mean-field phase diagrams produced by this interplay. Renormalization group analysis up to one-loop order gives flows of coupling constants, which in most cases lead to fluctuation-induced first-order phase transitions even when the SO(5) symmetry exists betwen the SC and AF. Behaviors of various physical quantities around the Mott critical point are predicted. Experiments in $\kappa$-(BEDT-TTF)$_2$X are discussed from this viewpoint.
Nagaosa Naoto
Onoda Shigeki
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