Wide-Field NV Magnetometry of Pressure-Quenched Hg-1223

ORAL

Abstract

Pressure quenching protocol (PQP) can retain high-pressure superconducting states at ambient pressure. Using wide-field nitrogen-vacancy (NV) magnetometry, we image Meissner screening in pressure-quenched HgBa₂Ca₂Cu₃O₈+δ (Hg-1223) with micrometer resolution. By reconstructing magnetic field maps during zero-field-cooling and warm-up, we extract spatially resolved Tc from the temperature dependence of the screened field. The quenched samples show elevated local onset temperatures relative to pristine controls, together with mesoscale inhomogeneity that likely reflects microstructure introduced during quenching. These results establish NV magnetometry as a noninvasive probe for quantifying superconductivity in pressure-quenched cuprates and for correlating metastable phases with their enhanced superconducting properties.

*This work was supported by the Deep Science Fund at Intellectual Ventures.

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Presenters

  • Ruotian Gong

    • Washington University in St. Louis

Authors

  • Ruotian Gong

    • Washington University in St. Louis

  • Thacien Habamahoro

    • University of Houston

  • Guanghui He

    • Washington University, St. Louis

  • Zhongyuan Liu

    • Washington University in St. Louis
    • Washington University, St. Louis

  • Paul C. W. Chu

    • University of Houston
    • TCSUH and Department of Physics, University of Houston; Lawrence Berkeley National Laboratory; Hong Kong University of Science and Technology

  • Liangzi Deng

    • University of Houston

  • Chong Zu

    • Washington University, St. Louis