Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 67: Unconventional Superconductors
TT 67.13: Vortrag
Donnerstag, 21. März 2024, 13:00–13:15, H 3007
Superconductivity with high upper critical field in Ta-Hf Alloys — •Pavan Kumar Meena, Sonika Jangid, Roshan Kumar Kushwaha, and Ravi Prakash Singh — Indian Institute of Science Education and Research Bhopal
Recently, there has been considerable interest in exploring superconducting alloys for potential applications in superconducting devices [1-4]. In this study, I will present our findings on superconductivity in TaxHf1-x alloys, utilizing magnetization, electrical resistivity, and specific heat measurements on polycrystalline samples [5]. The crystal structures of these alloys are composition dependent. Notably, when we substituted Hf (a Type-I superconductor with a critical temperature, Tc, of 0.12 K) with Ta (also a Type-I superconductor with a Tc of 4.4 K), a remarkable enhancement in TC was observed, along with a transition to Type-II superconductivity featuring high upper-critical fields. This transition is of particular interest from the perspective of materials science. Our specific heat measurements provided evidence of strong coupling superconductivity, aligning with conventional principles of superconductivity. These metallic alloys exhibit both metallic properties and a high upper-critical field, making them highly promising for practical superconducting devices like SQUID and qubits.
[1] T. G. Berlincourt et al., Phys. Rev. 131 (1963) 140
[2] J. K. Hulm et al., Phys. Rev. 123 (1961) 1569
[3] K. M. Wong et al., Phys. Rev. B 30 (1984) 1253
[4] A. P. Place et al., Nat. Commun. 12 (2021) 1779
[5] P. K. Meena et al., arXiv: 2305.19253 (2023)
Keywords: Binary alloys; High spin-orbit coupling; Unconventional superconductivity; fish tail effect