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Raising the superconducting Tc of gallium: In situ characterization of the transformation of α -Ga into β -Ga
Department of Physics, Stockholm University, Stockholm, SE-106 91, Sweden.
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
Department of Physics, Stockholm University, Stockholm, SE-106 91, Sweden.
2018 (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 β-Ga with a critical temperature Tc=6.04(5)K, while stable α-Ga has a much lower Tc<1.2K. Here we use a membrane-based nanocalorimeter to initiate the transition from α-Ga to β-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 10K above the melting temperature of α-Ga. After such treatment, the liquid supercools down to 232K, where β-Ga solidifies. We find that β-Ga is a strong-coupling type-I superconductor with Δ(0)/kBTc=2.00(5) and a Sommerfeld coefficient γn=1.53(4)mJ/molK2, 2.55 times higher than that in the α phase. The results allow a detailed comparison of fundamental thermodynamic properties between the two phases. © 2018 American Physical Society.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 18, article id 184517
National Category
Metallurgy and Metallic Materials Other Physics Topics
Identifiers
URN: urn:nbn:se:hh:diva-38708DOI: 10.1103/PhysRevB.97.184517Scopus ID: 2-s2.0-85048246191OAI: oai:DiVA.org:hh-38708DiVA, id: diva2:1276417
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
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  • Other locale
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Output format
  • html
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