Possible Collective Spin Excitation in the Spin-Triplet Superconducting State of Sr_2RuO_4 : Multi-Band Theory(Condensed matter: electronic structure and electric, magnetic, and optical properties)

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概要

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• We investigate possible collective spin excitation by calculating the dynamical spin susceptibility in the spin-triplet superconducting state of Sr_2RuO_4. The effect of the fluctuating triplet-pairing condensate on the spin susceptibility is taken into account. The momentum and band dependences of superconducting gap structure are determined microscopically by solving the linearized Eliashberg equation for a realistic three-band Hubbard model within the perturbation theory in Coulomb interaction, and the evolution of gap magnitude below the transition temperature is determined by the standard BCS gap equation. The triplet pairing symmetry is assumed to be the most promising form: d(k)〜(k_x+ik_y)z. For small (maybe realistic) anisotropy of pairing interaction in spin space, we expect a possible low-energy spin-wave mode as a peak structure in the imaginary part of the dynamical spin susceptibility, isolated from the spin excitation continuum. The present work is a natural extension of previous single-band calculations to a more realistic three-band calculation.

• 社団法人日本物理学会の論文
• 2008-02-15

著者

• Nomura Takuji

  Japan Atomic Energy Agency Hyogo

• Nomura Takuji

  Synchrotron Radiation Research Center Japan Atomic Energy Agency:jst Trip

• Nomura Takuji

  Synchrotron Radiation Research Center Japan Atomic Energy Agency

• Yamada Kosaku

  College Of Science And Engineering Ritsumeikan University

• HIRASHIMA Dai

  Department of Physics, Nagoya University

• Hirashima Dai

  Department Of Physics Nagoya University

• Yamada Kosaku

  College Of Engineering Shizuoka University

• Hirashima Dai

  Department of Material Science, International Christian University, Mitaka, Tokyo 181-8585, Japan

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