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arXiv · 1708.05526

Thermodynamic evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in the KFe2As2 superconductor

Chang-woo Cho·Jonathan Haiwei Yang·Junying Shen·Thomas Wolf·Rolf Lortz
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Abstract

We have investigated the magnetic phase diagram near the upper critical field of KFe2As2 by magnetic torque and specific heat experiments, using a high-resolution piezo-rotary positioner to precisely control the parallel orientation of the magnetic field with respect to the FeAs layers. We observe a clear double transition when the field is oriented strictly in-plane, and a characteristic upturn of the upper critical field line well beyond the Pauli limit at 4.7 T. This provides firm evidence that an FFLO state is realized in this iron-based KFe2As2 superconductor.

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Chang-woo Cho, Jonathan Haiwei Yang, Junying Shen, Thomas Wolf, Rolf Lortz. 2017-08-22. Thermodynamic evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in the KFe2As2 superconductor. https://doi.org/10.1103/physrevlett.119.217002

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