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Low-frequency electron–phonon interaction and superconductivity in L12 -type trialuminides Al3V
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2024-01-25 , DOI: 10.1088/1361-6668/ad1e33 Feihu Liu , Junling Che , Wei Fu , Li-Na Wu
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2024-01-25 , DOI: 10.1088/1361-6668/ad1e33 Feihu Liu , Junling Che , Wei Fu , Li-Na Wu
Superconductivity enhancement is often associated with phonon softening by doping or external pressure. In this paper, we report
L 1 2 -type trialuminides Al3V as a typical example belonging to this scenario. The electronic, phononic and superconducting properties have been studied by using the first-principle method. Under uniaxial compression, the superconducting transition temperature Tc
of Al3V can be increased from ≈1.5 K to its maximum at ≈7.3 K when the lattice approaches the structural instability. A detailed investigation of Al3V reveals that the (V: d)-(Al: p) hybrid bands are strongly coupled to the phonon modes with lower frequency. The uniaxial compression induces a significant softening of the phonon mode with non-zero phonon line-width, and yet keeps the electron density of states near the Fermi level unchanged. This leads to a stronger electron–phonon coupling (EPC) and therefore a higher Tc
. On the contrary, the
L 1 2 structure is more stable against the hydrostatic pressure and the phonon energy actually grows up when the hydrostatic pressure is increased. As a result, EPC becomes weaker and Tc
can be reduced to
⩽ 0.3 K under high hydrostatic pressure. Our results present an interesting example that superconductivity can enhanced by tuning the softened phonon via pressure or doping.
更新日期：2024-01-25
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