Wednesday, May 16, 2012

1205.3250 (Y. A. Ying et al.)

Dislocations and the enhancement of superconductivity in odd-parity
superconductor Sr$_2$RuO$_4$
   [PDF]

Y. A. Ying, N. E. Staley, Y. Xin, K. Sun, X. Cai, D. Fobes, T. Liu, Z. Q. Mao, Y. Liu
We report observation of the enhancement of superconductivity near lattice dislocations and the absence of the strengthening of vortex pinning in odd-parity superconductor Sr$_2$RuO$_4$, both surprising results in direct contrast to the well known sensitivity of superconductivity in Sr$_2$RuO$_4$ to disorder. The enhanced superconductivity appears to be related fundamentally to the two-component nature of the superconducting order parameter, as revealed in our phenomenological theory taking into account the effect of symmetry reduction near a dislocation.
View original: http://arxiv.org/abs/1205.3250

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