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

Kim, Gareoung; Yun, Jung‐Ho; Rawat, Pooja; Jung, Soon‐Gil; Choi, Woongjin; You, Tae‐Soo; Kim, Sung Jin; Rhyee, Jong‐Soo

doi:10.1016/j.actamat.2020.01.007

Cited by 42 publications

(23 citation statements)

References 36 publications

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“…The observed resistivity at room temperature is 71 µΩcm and the residual resistivity ratio RRR = ρ 300K /ρ 7K = 1.37 and is comparable with some Re-based binary and HEA superconductors [11,22,23]. The low value of RRR may be due to the existence of the atomic-scale disorder and the very small size of the domains in HEAs [8,24,25]. ρ(T ) above 50 K is found to be linear with temperature and then saturates at high temperatures.…”

Section: A Structural Characterizationsupporting

confidence: 59%

Boron based new high entropy alloy superconductor Mo0.11W0.11V0.11Re0.34B0.33

Motla,

Meena,

Singh

2022

Preprint

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Superconducting high entropy alloys (HEAs) are new members of disordered superconductors. We report the synthesis and investigation of a new superconducting high entropy alloy Mo0.11W0.11V0.11Re0.34B0.33 (MWVRB). It crystallized in the tetragonal CuAl2 crystal structure with space group (I4/mcm). Comprehensive transport, magnetization and heat capacity measurements confirmed bulk type-II superconductivity having transition temperature TC = 4.0 K. The low temperature electronic specific heat suggests a fully gapped superconducting state in weak coupling limit.

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Section: A Structural Characterizationsupporting

confidence: 59%

Boron based new high entropy alloy superconductor Mo0.11W0.11V0.11Re0.34B0.33

Motla,

Meena,

Singh

2022

Preprint

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“…1b. The HEA SC thin lm deposited at T s = 520 °C exhibited the highest XRD peak intensity, with a lattice parameter of a = 3.358 Å, which is similar to that of bulk Ta 1/6 Nb 2/6 Hf 1/6 Zr 1/6 Ti 1/6 HEA superconductors 10 . The inset of Fig.…”

mentioning

confidence: 59%

“…However, the critical current density (J c ), i.e., the maximum current density that can conduct electric current without any power dissipation, was reported to be 0.01-10 kA cm −2 for Co-Ni-Cu-Rh-Ir-Zr and Ta-Nb-Hf-Zr-Ti HEA superconductors. This value is extremely low for practical applications 10,11 .…”

mentioning

confidence: 98%

High critical current density and high-tolerance superconductivity in high-entropy alloy thin films

Jung

Han

Kim

et al. 2022

Preprint

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High-entropy alloy (HEA) superconductors—a new class of functional materials—can be utilized stably under extreme conditions, such as in space environments, owing to their high mechanical hardness and excellent irradiation tolerance1–7. However, the feasibility of practical applications of HEA superconductors has not yet been demonstrated because the critical current density (Jc) for HEA superconductors has not yet been adequately characterized. Here, we report the fabrication of high-quality SC thin films of Ta–Nb–Hf–Zr–Ti HEAs via a pulsed laser deposition. The thin films exhibit a large Jc of > 1 MA cm−2 at 4.2 K and are therefore favorable for SC devices as well as large-scale applications. In addition, they show extremely robust superconductivity to irradiation-induced disorder controlled by the dose of Kr-ion irradiation. The superconductivity of the HEA films is more than 1000 times more resistant to displacement damage than that of other promising superconductors with technological applications, such as MgB2, Nb3Sn, Fe-based superconductors, and high-Tc cuprate superconductors. These results demonstrate that HEA superconductors have considerable potential for use under extreme conditions, such as in aerospace applications, nuclear fusion reactors, and high-field SC magnets.

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“…This study paves the way for engineering research of HEA superconductors. The other pioneering work [18] was the evaluation of the critical current density J c . The sample comprised the bcc HEA superconductor Ta 1/6 Nb 2/6 Hf 1/6 Zr 1/6 Ti 1/6 with T c = 7.9 K, which is characterized as a strong coupled s-wave superconductor with a dirty limit (No.…”

Section: Ta-nb-hf-zr-timentioning

confidence: 99%

“…The pioneering review [16] of HEA superconductors proposed a thin film HEA and the need for the evaluation of J c , which have both recently been realized [18,23]. These kinds of research will be constantly carried out.…”

Section: Perspectivesmentioning

confidence: 99%

Cutting Edge of High-Entropy Alloy Superconductors from the Perspective of Materials Research

Kitagawa

Hamamoto

Ishizu

2020

Metals

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High-entropy alloys (HEAs) are a new class of materials which are being energetically studied around the world. HEAs are characterized by a multicomponent alloy in which five or more elements randomly occupy a crystallographic site. The conventional HEA concept has developed into simple crystal structures such as face-centered-cubic (fcc), body-centered-cubic (bcc) and hexagonal-closed packing (hcp) structures. The highly atomic-disordered state produces many superior mechanical or thermal properties. Superconductivity has been one of the topics of focus in the field of HEAs since the discovery of the bcc HEA superconductor in 2014. A characteristic of superconductivity is robustness against atomic disorder or extremely high pressure. The materials research on HEA superconductors has just begun, and there are open possibilities for unexpectedly finding new phenomena. The present review updates the research status of HEA superconductors. We survey bcc and hcp HEA superconductors and discuss the simple material design. The concept of HEA is extended to materials possessing multiple crystallographic sites; thus, we also introduce multisite HEA superconductors with the CsCl-type, α-Mn-type, A15, NaCl-type, σ-phase and layered structures and discuss the materials research on multisite HEA superconductors. Finally, we present the new perspectives of eutectic HEA superconductors and gum metal HEA superconductors.

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

Cited by 42 publications

References 36 publications

Boron based new high entropy alloy superconductor Mo0.11W0.11V0.11Re0.34B0.33

Boron based new high entropy alloy superconductor Mo0.11W0.11V0.11Re0.34B0.33

High critical current density and high-tolerance superconductivity in high-entropy alloy thin films

Cutting Edge of High-Entropy Alloy Superconductors from the Perspective of Materials Research

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