Nematic superconducting state in iron pnictide superconductors

Jun Li, Paulo J. Pereira, Jie Yuan, Yang-Yang Lv, Mei-Ping Jiang, Dachuan Lu, Zi-Quan Lin, Yong-Jie Liu, Jun-Feng Wang, Liang Li, Xiaoxing Ke, Gustaaf Van Tendeloo, Meng-Yue Li, Hai-Luke Feng, Takeshi Hatano, Hua-Bing Wang (), Pei-Heng Wu, Kazunari Yamaura (), Eiji Takayama-Muromachi, Johan Vanacken, Liviu F. Chibotaru () and Victor V. Moshchalkov
Additional contact information
Jun Li: Research Institute of Superconductor Electronics, Nanjing University
Paulo J. Pereira: INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven
Jie Yuan: Research Institute of Superconductor Electronics, Nanjing University
Yang-Yang Lv: Research Institute of Superconductor Electronics, Nanjing University
Mei-Ping Jiang: Research Institute of Superconductor Electronics, Nanjing University
Dachuan Lu: Research Institute of Superconductor Electronics, Nanjing University
Zi-Quan Lin: Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology
Yong-Jie Liu: Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology
Jun-Feng Wang: Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology
Liang Li: Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology
Xiaoxing Ke: Electron Microscopy for Materials Research (EMAT), University of Antwerp
Gustaaf Van Tendeloo: Electron Microscopy for Materials Research (EMAT), University of Antwerp
Meng-Yue Li: Research Institute of Superconductor Electronics, Nanjing University
Hai-Luke Feng: National Institute for Materials Science
Takeshi Hatano: National Institute for Materials Science
Hua-Bing Wang: Research Institute of Superconductor Electronics, Nanjing University
Pei-Heng Wu: Research Institute of Superconductor Electronics, Nanjing University
Kazunari Yamaura: National Institute for Materials Science
Eiji Takayama-Muromachi: National Institute for Materials Science
Johan Vanacken: INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven
Liviu F. Chibotaru: Theory of Nanomaterials Group, KU Leuven
Victor V. Moshchalkov: INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Nematic order often breaks the tetragonal symmetry of iron-based superconductors. It arises from regular structural transition or electronic instability in the normal phase. Here, we report the observation of a nematic superconducting state, by measuring the angular dependence of the in-plane and out-of-plane magnetoresistivity of Ba0.5K0.5Fe2As2 single crystals. We find large twofold oscillations in the vicinity of the superconducting transition, when the direction of applied magnetic field is rotated within the basal plane. To avoid the influences from sample geometry or current flow direction, the sample was designed as Corbino-shape for in-plane and mesa-shape for out-of-plane measurements. Theoretical analysis shows that the nematic superconductivity arises from the weak mixture of the quasi-degenerate s-wave and d-wave components of the superconducting condensate, most probably induced by a weak anisotropy of stresses inherent to single crystals.

Date: 2017
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DOI: 10.1038/s41467-017-02016-y

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