Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

Y. A. Ying, N. E. Staley, Y. Xin, K. Sun, X. Cai, D. Fobes, T. J. Liu, Z. Q. Mao and Y. Liu ()
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Y. A. Ying: The Pennsylvania State University
N. E. Staley: The Pennsylvania State University
Y. Xin: National High Magnetic Field Laboratory, Florida State University
K. Sun: University of Maryland, Condensed Matter Theory Center and Joint Quantum Institute
X. Cai: The Pennsylvania State University
D. Fobes: Tulane University
T. J. Liu: Tulane University
Z. Q. Mao: Tulane University
Y. Liu: The Pennsylvania State University

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Superconductors with a chiral p-wave pairing are of great interest because they could support Majorana modes that could enable the development of topological quantum computing technologies that are robust against decoherence. Sr2RuO4 is widely believed to be a chiral p-wave superconductor. Yet, the mechanism by which superconductivity emerges in this, and indeed most other unconventional superconductors, remains unclear. Here we show that the local superconducting transition temperature in the vicinity of lattice dislocations in Sr2RuO4 can be up to twice that of its bulk. This is all the more surprising for the fact that disorder is known to easily quench superconductivity in this material. With the help of a phenomenological theory that takes into account the crystalline symmetry near a dislocation and the pairing symmetry of Sr2RuO4, we predict that a similar enhancement should emerge as a consequence of symmetry reduction in any superconductor with a two-component order parameter.

Date: 2013
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DOI: 10.1038/ncomms3596

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