Multicritical Phenomena of Superconductivity and Antiferromagnetism in Organic Conductor κ-(BEDT-TTF)_2X : Condensed Matter: Electronic Properties, etc.

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概要

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• We study theoretically the multicritical phenomena of the superconductivity (SC) and antiferromagnetism (AF) in organic conductors ,κ-BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene) salts. The phase diagram and the experimental data on the nuclear magnetic resonance (NMR) relaxation rate l/T_1 is analysed in terms of the renormalization group method. The bicritical phenomenon observed experimentally indicates the rotational symmetry, i.e., SO(5) symmetry, of the SC and the AF. The critical exponent x for the divergence of 1/T_1 is well explained by x = ν(z - 1 - η) with the dynamical exponent z = 3/2 for the AF region while z = φ/ν〜1.84 at the bicritical point. These results strongly suggest that the origin of the SC is in common with that of the AF and that its symmetry is d-wave.

• 社団法人日本物理学会の論文
• 2000-08-15

著者

• NAGAOSA Naoto

  Department of Applied Physics, University of Tokyo

• Nagaosa Naoto

  Department Of Applied Physics Faculty Of Engineering University Of Tokyo

• MURAKAMI Shuichi

  Department of Physics and Electronics, Osaka Prefecture University

• Murakami Shuichi

  Department Of Applied Physics University Of Tokyo

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