Identifying detrimental effects for multi-orbital superconductivity - Application to Sr${}_2$RuO${}_4$

Abstract

We propose a general scheme to probe the compatibility of arbitrary pairing states with a given normal state Hamiltonian by the introduction of a concept called superconducting fitness. This new quantity gives a direct measure of the suppression of the superconducting critical temperature in presence of key symmetry breaking fields. A merit of the superconducting fitness is that it can be used as a tool to identify non-trivial mechanisms to suppress superconductivity under various external influences, in particular, magnetic fields or distortions, even in complex multi-orbital systems. In the light of this new concept we analyse the multi-band superconductor Sr${}_2$RuO${}_4$ and propose a new mechanism for the suppression of superconductivity in multi-orbital systems, which we call inter-orbital effect, as a possible explanation for the unusual limiting feature observed in the upper critical field of this material.

14 pages, 1 figure

References in corpus (4)

• First-Order Superconducting Transition of Sr2RuO4
• Specific-heat evidence of the first-order superconducting transition in Sr2RuO4
• Pauli-paramagnetic effects on mixed state properties in a strongly anisotropic superconductor ---Application to Sr_2_RuO_4_---
• Spin-orbit Coupling and Multiple Phases in Spin-triplet Superconductor Sr${}_2$RuO${}_4$

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