Physical properties and electronic structure of the two-gap superconductor V_2Ga_5
arxiv(2024)
摘要
We present a thorough investigation of the physical properties and
superconductivity of the binary intermetallic V2Ga5. Electrical resistivity and
specific heat measurements show that V2Ga5 enters its superconducting state
below Tsc = 3.5 K, with a critical field of Hc2,perp c(Hc2,para c) = 6.5(4.1)
kOe. With H perp c, the peak effect was observed in resistivity measurements,
indicating the ultrahigh quality of the single crystal studied. The resistivity
measurements under high pressure reveal that the Tsc is suppressed linearly
with pressure and reaches absolute zero around 20 GPa. Specific heat and muon
spin relaxation measurements both indicate that the two-gap s-wave model best
describes the superconductivity of V2Ga5. The spectra obtained from
angle-resolved photoemission spectroscopy measurements suggest that two
superconducting gaps open at the Fermi surface around the Z and Γ
points. These results are verified by first-principles band structure
calculations. We therefore conclude that V2Ga5 is a phonon-mediated two-gap
s-wave superconductor
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