Upward curvature of the upper critical field and the V-shaped pressure dependence of $T_c$ in the noncentrosymmetric superconductor PbTaSe${}_2$

Abstract

The temperature evolution of the upper critical field $H_{c2}(T)$ in the noncentrosymmetric superconductor PbTaSe${}_2$ was determined via resistivity measurements down to 0.5 K. A pronounced positive curvature in the $H_{c2}$-$T$ phase diagram was observed in the whole temperature range below $T_c$. The Seebeck coefficient $S(T)$ in the temperature range 5K$\le$$T$$\le$350K was found to be negative in sign, modest in magnitude and non-linear in temperature. In addition, the superconducting transition temperature $T_c$ under hydrostatic pressure shows a marked non-monotonic variation, decreasing initially with the applied pressure up to $P_c$$\sim$5-10 kbar but then rising with further pressurization. The underlying physical mechanisms of all these findings have been discussed.

12 pages, 5 figures

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Cited by in corpus (10)

• Exotic Superconducting Properties in Topological Nodal Semimetal PbTaSe${}_2$
• Nodeless superconductivity in noncentrosymmetric PbTaSe${}_2$ single crystals
• Superconducting properties in a candidate topological nodal line semimetal SnTaS${}_2$ with a centrosymmetric crystal structure
• Quantum oscillations in the non-centrosymmetric superconductor and topological nodal-line semimetal PbTaSe${}_2$
• $\mu$SR study of noncentrosymmetric superconductor PbTaSe${}_2$
• Topological Phase Transition Under Pressure in the Topological Nodal Line Superconductor PbTaSe${}_2$
• Highly responsive ground state of PbTaSe${}_2$: structural phase transition and evolution of superconductivity under pressure
• Anomalous Nernst Effect in Nonmagnetic Nodal Line Semimetal PbTaSe${}_2$
• Superconducting ground state study of valence skip compound AgSnSe${}_2$
• Enhancement of the superconducting transition temperature due to multiband effect in the topological nodal-line semimetal Pb${}_{1-x}$Sn${}_x$TaSe${}_2$