Anisotropic superconducting property studies of single crystal PbTaSe₂

Abstract

The anisotropic superconducting properties of PbTaSe single crystal is reported. Superconductivity with T = 3.83 ± 0.02 K has been characterized fully with electrical resistivity ρ(T), magnetic susceptibility χ(T), and specific heat C (T) measurements using single crystal samples. The superconductivity is type-II with lower critical field H and upper critical field H of 65 and 450 Oe (H⊥ to the ab-plane), 140 and 1500 Oe (H|| to the ab-plane), respectively. These results indicate that the superconductivity of PbTaSe is anisotropic. The superconducting anisotropy, electron-phonon coupling λ , superconducting energy gap Δ, and the specific heat jump ΔC/γT at T confirms that PbTaSe can be categorized as a bulk superconductor.

μSR study of the noncentrosymmetric superconductor PbTaSe2

“…Details of the crystal growth can be found in Ref. 34 . Muon spin rotation and relaxation (µSR) experiments were performed at the TRIUMF laboratory in Vancouver, Canada.…”

Topological phase transition under pressure in the topological nodal-line superconductor PbTaSe2

“…The detailed process of synthesis was described in Ref. [ 18,19 ]. Magnetotransport measurements were performed by a standard four-probe lock-in technique in a Quantum Design PPMS equipped with a 9 Tesla magnet.…”

Symmetry demanded topological nodal-line materials

“…Pb(Tl)TaSe 2 [73,[79][80][81][82][119][120][121]: PbTaSe 2 , shown in Table 4, is a layered, non-centrosymmetric compound in space group P-6m2 No.187 [79]. Specific heat, electrical resistivity, and magnetic susceptibility, London penetration depth measurements have shown it to be a anisotropic type-II BCS superconductor [79,[119][120][121].…”

“…Pb(Tl)TaSe 2 73,79-82,119-121 : PbTaSe 2 , shown in Table IV, is a layered, non-centrosymmetric compound in space group P-6m2 No.187 79 . Specific heat, electrical resistivity, and magnetic susceptibility, London penetration depth measurements have shown it to be a anisotropic type-II BCS superconductor 79,[119][120][121] . The crystal structure of PbTaSe 2 can be thought of as alternating stacks of TaSe 2 and hexagonal Pb layers, with Pb atoms directly sitting above the Se atoms.…”