Mystery of Excess Low Energy States in a Disordered Superconductor in a Zeeman Field

Details Mystery of Excess Low Energy States in a Disordered Superconductor in a Zeeman Field Mystery of Excess Low Energy States in a Disordered Superconductor in a Zeeman Field

2011-02-18

arxiv.org/abs/1102.3889v2

Physical Review Letters 107, 067003 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, plus supplementary section describing methods (2 pages)

Scientific paper

10.1103/PhysRevLett.107.067003

Tunneling density of states measurements of disordered superconducting (SC) Al films in high Zeeman fields reveal a significant population of subgap states which cannot be explained by standard BCS theory. We provide a natural explanation of these excess states in terms of a novel disordered Larkin-Ovchinnikov (dLO) phase that occurs near the spin-paramagnetic transition at the Chandrasekhar-Clogston critical field. The dLO superconductor is characterized by a pairing amplitude that changes sign at domain walls. These domain walls carry magnetization and support Andreev bound states, which lead to distinct spectral signatures at low energy.

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