Unconventional Superconductivity in MgCNi3

Details Unconventional Superconductivity in MgCNi3 Unconventional Superconductivity in MgCNi3

2002-08-19

arxiv.org/abs/cond-mat/0208367v1

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

A multiband superconductor with a conventional phonon mechanism can develop an unconventional state with a nontrivial order parameter phase relation between the individual bands. We propose that such a state can explain recent experimental results on MgCNi3, which are suggestive of both s-wave pairing symmetry and of unconventional superconductivity. We show that such a state gives rise to Andreev bound states, and to spontaneous currents, at surfaces and around impurities. We also investigate possible phase transitions between states with different order parameter symmetry.

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