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Raising the superconducting T-c of gallium: In situ characterization of the transformation of alpha-Ga into beta-Ga
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Halmstad University, Sweden.
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 32018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 18, article id 184517Article in journal (Refereed) Published
Abstract [en]

Gallium (Ga) displays several metastable phases. Superconductivity is strongly enhanced in the metastable beta-Ga with a critical temperature T-c = 6.04(5) K, while stable alpha-Ga has a much lower T-c < 1.2 K. Here we use a membrane-based nanocalorimeter to initiate the transition from alpha-Ga to beta-Ga on demand, as well as study the specific heat of the two phases on one and the same sample. The in situ transformation is initiated by bringing the temperature to about 10 K above the melting temperature of alpha-Ga. After such treatment, the liquid supercools down to 232 K, where beta-Ga solidifies. We find that beta-Ga is a strong-coupling type-I superconductor with Delta(0)/k(B)T(c) = 2.00(5) and a Sommerfeld coefficient gamma(n) = 1.53(4) mJ/molK(2), 2.55 times higher than that in the alpha phase. The results allow a detailed comparison of fundamental thermodynamic properties between the two phases.

Place, publisher, year, edition, pages
2018. Vol. 97, no 18, article id 184517
Keywords [en]
Crystal structure, Density of states, Specific heat, Superconducting phase transition, Superconductivity, Thermal properties, Thermodynamics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-157722DOI: 10.1103/PhysRevB.97.184517ISI: 000433287200004OAI: oai:DiVA.org:su-157722DiVA, id: diva2:1236358
Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-02Bibliographically approved

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