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Origin of Excess Low-Energy States in a Disordered Superconductor in a Zeeman Field Y. L. Loh,1
 

Summary: Origin of Excess Low-Energy States in a Disordered Superconductor in a Zeeman Field
Y. L. Loh,1
N. Trivedi,1
Y. M. Xiong,2
P. W. Adams,2
and G. Catelani3
1
Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA
2
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
3
Department of Physics, Yale University, 217 Prospect Street, New Haven, Connecticut 06520, USA
(Received 17 February 2011; revised manuscript received 25 June 2011; published 2 August 2011)
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.

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science