Electronic theory for superconductivity in : Triplet pairing due to spin-fluctuation exchange

I. Eremin; D. Manske; C. Joas; K. H. Bennemann

doi:10.1209/epl/i2002-00455-9

All issues

Volume 58 / No 6 (June 2002)

Europhys. Lett., 58 6 (2002) 871-877

Abstract

Issue		Europhys. Lett. Volume 58, Number 6, June 2002


Page(s)		871 - 877
Section		Condensed matter: structure, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2002-00455-9
Published online		01 June 2002

Europhys. Lett., 58 (6), pp. 871-877 (2002)

Electronic theory for superconductivity in $\chem{Sr_2RuO_4}$ : Triplet pairing due to spin-fluctuation exchange

I. Eremin¹^,2, D. Manske¹, C. Joas¹ and K. H. Bennemann¹

¹ Institut für Theoretische Physik, Freie Universität Berlin D-14195 Berlin, Germany
² Physics Department, Kazan State University - 420008 Kazan, Russia

Received: 23 August 2001
Accepted: 2 April 2002

Abstract

Using a Hubbard Hamiltonian for the three electronic bands crossing the Fermi level in $\chem{Sr_2RuO_4}$ , we calculate the band structure and spin susceptibility $\chi(\bm{q},\omega)$ in quantitative agreement with nuclear magnetic resonance (NMR) and inelastic neutron scattering (INS) experiments. The susceptibility has two peaks at $\bm{Q}_i = (2\pi/3a, 2\pi/3a,0)$ due to the nesting Fermi surface properties and at $\bm{q}_i = (0.2\pi/a,0,0)$ due to the tendency towards ferromagnetism. Applying spin-fluctuation exchange theory as in layered cuprates we determine from $\chi(\bm{q},\omega)$ , electronic dispersions, and Fermi surface topology that superconductivity in $\chem{Sr_2RuO_4}$ consists of triplet pairing. Using $\chi(\bm{q},\omega)$ we can exclude s- and d-wave symmetry for the superconducting order parameter. Furthermore, within our analysis and approximations we find that the order parameter will have a node between neighboring $\chem{RuO_2}$ -planes and that in the $\chem{RuO_2}$ -plane $f_{x^2-y^2}$ -wave and p-wave symmetry are close in energy.

PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.25.Ha – Magnetic properties

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