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Physical insight of superconductivity of Nb 2 AlC: in situ Raman spectrometry investigation
Author(s) -
Xiang Huimin,
Wang Xiaohui,
Wang Jingyang,
Zhou Yanchun
Publication year - 2013
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4196
Subject(s) - superconductivity , phonon , raman spectroscopy , anharmonicity , condensed matter physics , coupling (piping) , raman scattering , atmospheric temperature range , line (geometry) , spectral line , materials science , chemistry , physics , quantum mechanics , thermodynamics , geometry , mathematics , metallurgy
Superconductivity of Nb 2 AlC has been previously reported, but the origin is not clear. In this paper, in situ Raman spectra of Nb 2 AlC are measured in the temperature range from 80 to 380 K at ambient pressure. The line‐width of E 2g ( ω 1 ) mode increases with temperature which originates from the anharmonic phonon–phonon scattering. On the contrary the line‐widths of E 2g ( ω 2 ) and A 1g ( ω 4 ) modes decrease continuously at elevated temperature. The phenomenon is explained by the electron–phonon coupling. The origin of superconductivity is therefore interpreted by the coupling of Nb 4d electrons with E 2g ( ω 2 ) and A 1g ( ω 4 ) phonon modes. Copyright © 2013 John Wiley & Sons, Ltd.