Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

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. Sr 2 RuO 4 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 Sr 2 RuO 4 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 Sr 2 RuO 4 , we predict that a similar enhancement should emerge as a consequence of symmetry reduction in any superconductor with a two-component order parameter. Strontium ruthenate is an odd-parity superconductor that could support Majorana fermions. Ying et al . report that the critical temperature doubles near lattice dislocations in this material compared with its bulk, arising from effects that could be found in other unconventional superconductors.