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Strongly correlated and strongly coupled s-wave superconductivity of the high entropy alloy Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 compound
Acta Materialia ( IF 8.3 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.actamat.2020.01.007
Gareoung Kim , Min-Ho Lee , Jae Hyun Yun , Pooja Rawat , Soon-Gil Jung , Woongjin Choi , Tae-Soo You , Sung Jin Kim , Jong-Soo Rhyee

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 A 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.

中文翻译:

高熵合金Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6化合物的强相关强耦合s波超导性

摘要 高熵合金(HEA)是一种通过高混合熵稳定的多种元素的随机混合物。我们基于电弧熔化合成了一种 Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 体心立方结构的 HEA 化合物,其晶格参数为 a = 3.38 A。从电学和磁学性质的测量中,我们获得了超导性质,如电子-声子耦合常数λel-ph、电子-声子势Vel-ph、费米能级D(EF)的态密度、超导能隙2Δ(0 )/kBTc、上临界场 Hc2(0)、相干长度 ξ 和临界电流密度 Jc。该化合物在 Tc = 7.85 K 时表现出超导转变。该化合物具有相对较大的比热跃变 (ΔC/γTc)、高有效载流子质量 (29 me) 和高 Kadowaki-Woods 比 (A/γ2, 它在重费米化合物中起重要作用),表明它位于脏极限内的强耦合 s 波超导体内。其涡旋钉扎力由 Dew-Huges 双指数钉扎模型描述,这意味着有两种类型的钉扎机制。HEA 化合物中 s 波超导性中强相关行为的可能共存值得注意,因为许多强相关超导体,例如重费米子和高 Tc 铜酸盐超导体,具有节点间隙对称性。HEA 化合物建议利用当前强相关超导体以及金属超导体开发不同类型的超导性。其涡旋钉扎力由 Dew-Huges 双指数钉扎模型描述,这意味着有两种类型的钉扎机制。HEA 化合物中 s 波超导性中强相关行为的可能共存值得注意,因为许多强相关超导体,例如重费米子和高 Tc 铜酸盐超导体,具有节点间隙对称性。HEA 化合物建议利用当前强相关超导体以及金属超导体开发不同类型的超导性。其涡旋钉扎力由 Dew-Huges 双指数钉扎模型描述,这意味着有两种类型的钉扎机制。HEA 化合物中 s 波超导性中强相关行为的可能共存值得注意,因为许多强相关超导体,例如重费米子和高 Tc 铜酸盐超导体,具有节点间隙对称性。HEA 化合物建议利用当前强相关超导体以及金属超导体开发不同类型的超导性。HEA 化合物中 s 波超导性中强相关行为的可能共存值得注意,因为许多强相关超导体,例如重费米子和高 Tc 铜酸盐超导体,具有节点间隙对称性。HEA 化合物建议利用当前强相关超导体以及金属超导体开发不同类型的超导性。HEA 化合物中 s 波超导性中强相关行为的可能共存值得注意,因为许多强相关超导体,例如重费米子和高 Tc 铜酸盐超导体,具有节点间隙对称性。HEA 化合物建议利用当前强相关超导体以及金属超导体开发不同类型的超导性。
更新日期:2020-03-01
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