Discovery of Superconductivity in AlB 2 -type hexagonal YGa 2

A crystalline sample YGa$_2$ with the AlB$_2$-type hexagonal structure has been synthesized using the self-flux method. We measured electrical resistivity and specific heat down to 0.4 K and in fields up to 200 mT. The obtained data reveal type-II superconductivity. Unusual behaviour of the temperat...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2021-08, Vol.33 (31), p.315401
Main Authors: Tran, Vinh Hung, Sahakyan, Mane, Bukowski, Zbigniew
Format: Article
Language:English
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Summary:A crystalline sample YGa$_2$ with the AlB$_2$-type hexagonal structure has been synthesized using the self-flux method. We measured electrical resistivity and specific heat down to 0.4 K and in fields up to 200 mT. The obtained data reveal type-II superconductivity. Unusual behaviour of the temperature dependence of upper critical field $H_{c2}(T_c)$ was attributed to the crystal twinning of two phases possessing close lattice parameters. We determined thermodynamic parameters in the superconducting and normal states of YGa$_2$. DFT calculations indicated a large change in the Fermi velocity of carriers nearby cylinder-like structured Fermi surface along the $\Gamma - A$ line.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ac02e3