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Strongly Correlated and Strong Coupled S-Wave Superconductivity of the High Entropy Alloy Ta 1/6Nb 2/6Hf 1/6Zr 1/6Ti 1/6 Compound

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Document pages: 24 pages

Abstract: High entropy alloy (HEA) is a random mixture of multiple elements stabilized by a high mixing entropy. We synthesized Ta1 6Nb2 6Hf1 6Zr1 6Ti1 6 bulk HEA compound as a body-centered cubic structure with the lattice parameter a = 3.38 Å by arc melting. From the electronic and magnetic properties measurements, we found that it exhibits a superconducting transition at Tc = 7.85 K. From the superconducting properties such as electron-phonon coupling constant λel-ph, electron-phonon potential Vel-ph, density of states at the Fermi level D(EF), superconducting energy gap 2Δ(0) kBTc, upper-critical field Hc2(0), coherence length ξ, and critical current Jc etc, we found that it is a strong coupled s-wave superconductor in a dirty limit. Meanwhile, the relative sizeable specific heat jump (ΔC γTc), high effective mass of carrier (29 me), and high Kadowaki-Woods ratio which is close to one of heavy Fermi compounds indicate that it resides in the limit of a strongly correlated system. The vortex pinning force is described by the Dew-Huges double exponential pinning model, implying that there are two types of pinning mechanism. The possible coexistence of strongly correlated behavior in s-wave superconductivity on the HEA compounds is noteworthy because many of the strongly correlated superconductors have a nodal gap symmetry such as heavy fermion and high Tc cuprate superconductors. The HEA compound suggests a different types of superconductivity with the current strongly correlated superconductors as well as metallic superconductors.

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