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Title: Strong increase in superconducting T{sub c} for Nb{sub 2}InC under compressive strain

Using first-principles, we investigate strain effects on the phonon spectrum, heat capacity C{sub V}, Debye temperature θ{sub D}, and electron-phonon coupling of Nb{sub 2}InC. It finds that its heat capacity increases and Debye temperature decreases as strain increases. Analysis of the phonon spectrum and Eliashberg spectral function shows that the superconductivity of Nb{sub 2}InC mainly originates from C vibrations parallel to and Nb vibrations perpendicular to the Nb{sub 2}InC layers. A significant enhancement of the superconducting transition temperature T{sub c} up to 25.98 K is observed at η = −10% due to an increase of In atomic vibrations under strain. These results provide a means of tuning the superconducting properties of Nb{sub 2}InC.
Authors:
; ; ; ;  [1] ;  [2]
  1. College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001 (China)
  2. School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275 (China)
Publication Date:
OSTI Identifier:
22413207
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DEBYE TEMPERATURE; ELECTRON-PHONON COUPLING; INDIUM CARBIDES; LAYERS; NIOBIUM COMPOUNDS; SPECIFIC HEAT; SPECTRAL FUNCTIONS; STRAINS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TRANSITION TEMPERATURE