Retention of the high-pressure-induced metastable superconducting phases in Bi
ORAL
Abstract
To investigate the potential industrial application of high pressure superconductivity, the effect of pressure quenching at liquid nitrogen temperature was studied on the non-superconducting single crystal bismuth (Bi) up to 12 GPa, where three superconducting phases are pressure induced. They are the monoclinic phase (Bi-II), tetragonal host-guest phase (Bi-III), and bcc phase (Bi-V), progressively with increase of pressure. Superconducting phases with Tc up to ~ 7 K were retained upon pressure quenching, with Bi-III being the most robust state. The retained superconducting phase stability of Bi-III was tested with thermal cycles. Our results indicate that phase may be related to post-quench residual pressure. The results of pressure quenching experiments demonstrated that metastable phases can be exploited to retain higher Tcs at ambient pressure. Furthermore, this technique also shows potential to quickly map out different metastable phases.
*The work is supported by US Air Force Office of Scientific Research Grant FA9550-15-1-0236 and FA9550-20-1-0068, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston.
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Presenters
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Trevor Bontke
- University of Houston
- Texas Center for Superconductivity & Physics Department at University of Houston
- Texas Center of Superconductivity and Physics Department at the University of Houston