The role of spin-orbit coupling for the superconducting state in

K. K. Ng; M. Sigrist

doi:10.1209/epl/i2000-00173-x

All issues

Volume 49 / No 4 (February II 2000)

Europhys. Lett., 49 4 (2000) 473-479

Abstract

Issue		Europhys. Lett. Volume 49, Number 4, February II 2000


Page(s)		473 - 479
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2000-00173-x
Published online		01 September 2002

Europhys. Lett., 49 (4), pp. 473-479 (2000)

The role of spin-orbit coupling for the superconducting state in $\ab{Sr_2RuO_4}$

K. K. Ng and M. Sigrist

Yukawa Institute for Theoretical Physics, Kyoto University - Kyoto 606-8502, Japan

Received: 3 September 1999
Accepted: 29 November 1999

Abstract

The odd-parity spin-triplet Cooper pairing states show a six-fold degeneracy for a quasi–two-dimensional electron system. In this article we show how spin-orbit coupling can lift this degeneracy for $\ab{Sr_2RuO_4}$ taking the band structure based on the three relevant $t_{2g}$ -orbitals of the Ru-ions into account. The stabilized state depends on the relative strength of the pairing interaction. We show that under reasonable assumptions the chiral pairing state ${\bm d} ({\bm k} ) = \hat{{\bm z}} (k_x \pm i k_y)$ is favored against the others.

PACS: 71.70.Ej – Spin orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 74.25.Dw – Superconductivity phase diagrams

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