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• W2537701812 abstract "Abstract First principles calculations are performed using density functional theory and density functional perturbation theory for SnAs. Total energy calculations show the first order phase transition from an NaCl structure to a CsCl one at around 37 GPa, which is also confirmed from enthalpy calculations and agrees well with experimental work. Calculations of the phonon structure and hence the electron-phonon coupling, λ ep , and superconducting transition temperature, T c , across the phase diagram are performed. These calculations give an ambient pressure T c , in the NaCl structure, of 3.08 K, in good agreement with experiment whilst at the transition pressure, in the CsCl structure, a drastically increased value of T c = 12.2 K is found. Calculations also show a dramatic increase in the electronic density of states at this pressure. The lowest energy acoustic phonon branch in each structure also demonstrates some softening effects. Electronic structure calculations of the Fermi surface in both phases are presented for the first time as well as further calculations of the generalised susceptibility with the inclusion of matrix elements. These calculations indicate that the softening is not derived from Fermi surface nesting and it is concluded to be due to a wavevector-dependent enhancement of the electron-phonon coupling." @default.
• W2537701812 created "2016-10-28" @default.
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• W2537701812 date "2017-01-01" @default.
• W2537701812 modified "2023-09-28" @default.
• W2537701812 title "Enhanced superconductivity in the high pressure phase of SnAs studied from first principles" @default.
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• W2537701812 doi "https://doi.org/10.1016/j.physb.2016.10.026" @default.
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