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Strongly correlated and strongly coupled s-wave superconductivity of the high entropy alloy Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 compound

Title
Strongly correlated and strongly coupled s-wave superconductivity of the high entropy alloy Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 compound
Authors
Kim G.Lee M.-H.Yun J.H.Rawat P.Jung S.-G.Choi W.You T.-S.Kim S.J.Rhyee J.-S.
Ewha Authors
김성진
SCOPUS Author ID
김성진scopus
Issue Date
2020
Journal Title
Acta Materialia
ISSN
1359-6454JCR Link
Citation
Acta Materialia vol. 186, pp. 250 - 256
Keywords
High entropy alloyS-waveStrongly correlated systemSuperconductor
Publisher
Acta Materialia Inc
Indexed
SCI; SCIE; SCOPUS scopus
Document Type
Article
Abstract
High entropy alloy (HEA) is a random mixture of multiple elements stabilized by high mixing entropy. We synthesized a Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 bulk HEA compound as a body-centered cubic structure with lattice parameter a = 3.38 Å based on arc melting. From the electronic and magnetic property measurements, we obtained 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 density Jc. The compound showed a superconducting transition at Tc = 7.85 K. The compound has relatively sizeable specific heat jump (ΔC/γTc), high effective mass of carrier (29 me), and high Kadowaki-Woods ratio (A/γ2, which plays an important role in the heavy Fermi compounds), indicating that it resides within the strongly coupled s-wave superconductor within a dirty limit. Its vortex pinning force is described by the Dew-Huges double exponential pinning model, implying that there are two types of pinning mechanisms. The possible coexistence of strongly correlated behavior in s-wave superconductivity in HEA compounds is noteworthy because many of the strongly correlated superconductors, such as heavy-fermion and high Tc cuprate superconductors, have nodal gap symmetry. The HEA compound suggests exploiting different types of superconductivity with the current strongly correlated superconductors as well as metallic superconductors. © 2020 Acta Materialia Inc.
DOI
10.1016/j.actamat.2020.01.007
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자연과학대학 > 화학·나노과학전공 > Journal papers
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