Transport and magnetization measurements of the high-T<sub>c</sub> superconductor Ba<sub>1-x</sub>K<sub>x</sub>BiO<sub>3</sub>

ORAL

Abstract

The perovskite Ba1-xKxBiO3 (BKBO) exhibits several interesting properties, including charge-density wave order accompanied by oxygen-breathing structural distortions and a high superconducting transition temperature (Tc) of just above 30 K [1]. There has been considerable recent progress toward understanding the structural properties of BKBO [2], yet electronic transport measurements have historically been difficult due to poor surface quality and large contact resistance. Our recent seeded growths have successfully produced sizable homogeneous crystals, allowing for better electrical contacts with sample surfaces. Here we present Hall effect and magnetoresistance measurements of BKBO crystals at several potassium concentrations. We also utilize a contactless probe to measure higher-order nonlinear magnetization [3], allowing us to sensitively probe superconducting fluctuations.

[1] A. W. Sleight, Physica C 514, 152 (2015)



[2] S. Griffitt, M. Spaić et al., Nat. Commun. 14, 845 (2023)



[3] D. Pelc et al. Nat. Comm. 10, 2729 (2019)

*This work was supported by the Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC0016371.

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Presenters

  • Siddharth S Gorregattu

    • University of Minnesota

Authors

  • Siddharth S Gorregattu

    • University of Minnesota

  • Xing He

    • University of Minnesota

  • Dayu Zhai

    • University of Minnesota

  • Dinesh K Shukla

    • UGC-DAE Consortium for Scientific Research
    • University of Minnesota
    • University of Minnesota, Twin Cities

  • Damjan Pelc

    • University of Zagreb

  • Martin Greven

    • University of Minnesota