Anomalous transverse resistance in 122-type iron-based superconductors

Yangyang Lv; Yu Dong; Dachuan Lu; Wanghao Tian; Zuyu Xu; Wei Chen; Xianjing Zhou; Jie Yuan; Kui Jin; Song Bao; Shichao Li; Jinsheng Wen; Liviu F Chibotaru; Tobias Schwarz; Reinhold Kleiner; Dieter Koelle; Jun Li; Huabing Wang; Peiheng Wu

doi:10.1038/s41598-018-37152-y

Anomalous transverse resistance in 122-type iron-based superconductors

Sci Rep. 2019 Jan 24;9(1):664. doi: 10.1038/s41598-018-37152-y.

Authors

Yangyang Lv¹, Yu Dong¹, Dachuan Lu¹, Wanghao Tian¹, Zuyu Xu¹, Wei Chen¹, Xianjing Zhou¹, Jie Yuan^{2

3}, Kui Jin^{2

3

4}, Song Bao^{5

6}, Shichao Li^{5

6}, Jinsheng Wen^{5

6}, Liviu F Chibotaru⁷, Tobias Schwarz⁸, Reinhold Kleiner⁸, Dieter Koelle⁸, Jun Li⁹, Huabing Wang¹, Peiheng Wu^{1

10}

Affiliations

¹ Research Institute of Superconductor Electronics, Nanjing University, Nanjing, 210023, China.
² Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
³ Key Laboratory for Vacuum Physics, University of Chinese Academy of Sciences, Beijing, 100049, China.
⁴ University of Chinese Academy of Sciences, Beijing, 100049, China.
⁵ School of Physics, Nanjing University, Nanjing, 210023, China.
⁶ National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China.
⁷ Theory of Nanomaterials Group, KU Leuven, Celestijnenlaan 200F, Leuven, B-3001, Belgium.
⁸ Physikalisches Institut-Experimentalphysik II and Center for Collective Quantum Phenomena in LISA, Universität Tübingen, Auf der Morgenstelle 14, Tübingen, D-72076, Germany.
⁹ Research Institute of Superconductor Electronics, Nanjing University, Nanjing, 210023, China. junli@nju.edu.cn.
¹⁰ Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, Anhui, China.

Abstract

The study of transverse resistance of superconductors is essential to understand the transition to superconductivity. Here, we investigated the in-plane transverse resistance of Ba_0.5K_0.5Fe₂As₂ superconductors, based on ultra-thin micro-bridges fabricated from optimally doped single crystals. An anomalous transverse resistance was found at temperatures around the superconducting transition, although magnetic order or structure distortion are absent in the optimal doping case. With the substitution of magnetic and nonmagnetic impurities into the superconducting layer, the anomalous transverse resistance phenomenon is dramatically enhanced. We find that anisotropic scattering or the superconducting electronic nematic state related with the superconducting transition may contribute to this phenomenon.