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Condensed Matter > Superconductivity
Title: Enhanced weak superconductivity in trigonal $γ$-PtBi$_2$
(Submitted on 31 Aug 2023 (v1), last revised 8 Apr 2024 (this version, v2))
Abstract: Electrical resistivity experiments show superconductivity at $T_c = 1.1\,$K in a high-quality single crystal of trigonal $\gamma$-PtBi$_2$, with an enhanced critical magnetic field $\mu_0H_{c2}(0) \gtrsim 1.5\,$Tesla and a low critical current-density $J_c(0)\approx 40\,\mathrm{A}/\mathrm{cm}^2$ at $H=0$. Both $T_c$ and $H_{c2}(0)$ are the highest reported values for stoichiometric bulk samples at ambient pressure. We found a weak $H_{c2}$ anisotropy with $\Gamma=H_{c2}^{ab}/H_{c2}^{c} < 1$, which is unusual among superconductors. Under a magnetic field, the superconducting transition becomes broader and asymmetric. Along with the low critical currents, this observation suggests an inhomogeneous superconducting state. In fact, no trace of superconductivity is observed through field-cooling--zero-field-cooling magnetization experiments.
Submission history
From: Víctor Correa [view email][v1] Thu, 31 Aug 2023 19:53:47 GMT (1711kb)
[v2] Mon, 8 Apr 2024 18:29:05 GMT (940kb)
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