title: Origin of excess low-energy states in a disordered superconductor in a Zeeman field.
abstract: Tunneling density of states measurements of disordered superconducting 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 phase that occurs near the spin-paramagnetic transition at the Chandrasekhar-Clogston critical field. The disordered Larkin-Ovchinnikov superconductor is characterized by a pairing amplitude that changes sign at domain walls. These domain walls carry magnetization and support Andreev bound states that lead to distinct spectral signatures at low energy.
authors: Department of Physics, The Ohio State University, Columbus, 43210, USA.
authors: Y L
authors: YL
authors: Loh
authors: N
authors: N
authors: Trivedi
authors: Y M
authors: YM
authors: Xiong
authors: P W
authors: PW
authors: Adams
authors: G
authors: G
authors: Catelani