A note on the upper critical field of Sr${}_2$RuO${}_4$ under strain

Abstract

In the light of the recently discussed mechanism for suppression of superconductivity in multi-orbital systems called inter-orbital effect, here we extend our analysis of the upper critical field in Sr${}_2$RuO${}_4$ now under strain. We show that the presence of the standard orbital effect and the new mechanism can consistently account for the qualitative changes observed in the upper critical field for the strained system, in particular, combining the overall enhancement of the critical field with the reduction in the anisotropy. The proposed picture holds for a triplet superconducting state, showing that a singlet state is not the only possibility to account for the observations. We suggest further experiments in order to clarify our understanding about the superconducting phase of Sr${}_2$RuO${}_4$.

8 pages, 1 figure. Submitted to the proceedings of the International Conference on Strongly Correlated Electron Systems 2016, held in Hangzhou, China. To appear in the Journal of Physics: Conference Series

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• Simultaneous Evidence for Pauli Paramagnetic Effects and Multiband Superconductivity in KFe${}_2$As${}_2$ by Small-Angle Neutron Scattering Studies of the Vortex Lattice
• $T_c$ and Pauli limited critical field of ${\text{Sr}}_2\text{Ru}{\text{O}}_4$: uniaxial strain dependence
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