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PreprintarXiv licencearXiv

Vortex pinning of Ba0.62K0.38BiO3 investigated by magneto-optical Kerr-effect and magnetization measurements

  • Soichiro Yamane
  • Sota Nakamura
  • Atsutoshi Ikeda
  • Dayu Zhai
  • Siddarth Gorregattu
  • Xing He
  • Sudarshan Sharma
  • Yipeng Cai
  • Yasutomo J. Uemura
  • Martin Greven
  • Shingo Yonezawa
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Abstract

Vortex pinning plays a crucial role in determining properties of type-II superconductors. For example, it governs the irreversible magnetic response as well as dissipation caused by vortex motion. Here, we study vortex pinning in the three-dimensional oxide superconductor Ba1-xKxBiO3 using ultra-high-resolution magneto-optical Kerr effect (MOKE) and detailed magnetization measurements. We find that the zero-field MOKE signal in the superconducting state exhibits a pronounced magnetic-history dependence. This behavior closely resembles the remanent magnetization caused by trapped vortices. Furthermore, we demonstrate that the observed evolution of the MOKE signals is well described by Bean's critical-state model for trapped vortices. Our results establish MOKE as a viable optical and mesoscopic probe of vortex pinning in type-II superconductors, providing a new complementary approach to investigate mixed-state phenomena. We also find that the training-field dependence of the MOKE is linear near zero training field, without any anomalies indicative of spontaneous time-reversal-symmetry breaking in an unconventional superconducting state. Our study defines a clear protocol to distinguish vortex-induced MOKE responses from those associated with a time-reversal-symmetry broken superconducting order parameter.

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Cite

BibTeXRIS
BibTeX
@misc{yamane2026vortex,
  title = {{Vortex pinning of Ba$_0.62$K$_0.38$BiO$_3$ investigated by magneto-optical Kerr-effect and magnetization measurements}},
  author = {Soichiro Yamane and Sota Nakamura and Atsutoshi Ikeda and Dayu Zhai and Siddarth Gorregattu and Xing He and Sudarshan Sharma and Yipeng Cai and Yasutomo J. Uemura and Martin Greven and Shingo Yonezawa},
  howpublished = {arXiv},
  year = {2026},
  month = jun,
  doi = {10.48550/arxiv.2606.10300},
  eprint = {2606.10300},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.10300},
}
RIS
TY  - UNPB
TI  - Vortex pinning of Ba_0.62K_0.38BiO_3 investigated by magneto-optical Kerr-effect and magnetization measurements
AU  - Soichiro Yamane
AU  - Sota Nakamura
AU  - Atsutoshi Ikeda
AU  - Dayu Zhai
AU  - Siddarth Gorregattu
AU  - Xing He
AU  - Sudarshan Sharma
AU  - Yipeng Cai
AU  - Yasutomo J. Uemura
AU  - Martin Greven
AU  - Shingo Yonezawa
PY  - 2026
DA  - 2026/06/09
PB  - arXiv
DO  - 10.48550/arxiv.2606.10300
UR  - https://arxiv.org/abs/2606.10300
AB  - Vortex pinning plays a crucial role in determining properties of type-II superconductors. For example, it governs the irreversible magnetic response as well as dissipation caused by vortex motion. Here, we study vortex pinning in the three-dimensional oxide superconductor Ba1-xKxBiO3 using ultra-high-resolution magneto-optical Kerr effect (MOKE) and detailed magnetization measurements. We find that the zero-field MOKE signal in the superconducting state exhibits a pronounced magnetic-history dependence. This behavior closely resembles the remanent magnetization caused by trapped vortices. Furthermore, we demonstrate that the observed evolution of the MOKE signals is well described by Bean's critical-state model for trapped vortices. Our results establish MOKE as a viable optical and mesoscopic probe of vortex pinning in type-II superconductors, providing a new complementary approach to investigate mixed-state phenomena. We also find that the training-field dependence of the MOKE is linear near zero training field, without any anomalies indicative of spontaneous time-reversal-symmetry breaking in an unconventional superconducting state. Our study defines a clear protocol to distinguish vortex-induced MOKE responses from those associated with a time-reversal-symmetry broken superconducting order parameter.
ER  -