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Strong Electron–Phonon Interaction Establishes Correlation between Superconducting and Charge Density Wave States in NbSe2


Affiliations
1 Department of Physics, North Orissa University, Baripada 757 003, India
 

Here an analytical expression is proposed for the correlation between superconducting (SC) transition temperature (Tsc) derived by Louie and Cohen and charge density wave (CDW) transition temperature derived by Peierls at strong electron–phonon interaction. This expression was verified by the pressure effect Tsc and Tcdw of 2H-NbSe2 with m ˜ 64.86 and c ˜ 2.24 as best-fitting parameters. From these parameters, phonon energies h√ω2sc ˜ 3.8 meV and hωcdw ˜ 1.4 meV were calculated for SC and CDW states respectively. It also provides Tcdw very close to the experimental values of 2H- and 4H-NbSe2, regardless of their stacking order and coordination difference.

Keywords

Charge Density Wave, Phonon Energy, Superconductivity, Transition-Metal Compound.
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  • Strong Electron–Phonon Interaction Establishes Correlation between Superconducting and Charge Density Wave States in NbSe2

Abstract Views: 320  |  PDF Views: 97

Authors

I. Naik
Department of Physics, North Orissa University, Baripada 757 003, India
S. Sethy
Department of Physics, North Orissa University, Baripada 757 003, India

Abstract


Here an analytical expression is proposed for the correlation between superconducting (SC) transition temperature (Tsc) derived by Louie and Cohen and charge density wave (CDW) transition temperature derived by Peierls at strong electron–phonon interaction. This expression was verified by the pressure effect Tsc and Tcdw of 2H-NbSe2 with m ˜ 64.86 and c ˜ 2.24 as best-fitting parameters. From these parameters, phonon energies h√ω2sc ˜ 3.8 meV and hωcdw ˜ 1.4 meV were calculated for SC and CDW states respectively. It also provides Tcdw very close to the experimental values of 2H- and 4H-NbSe2, regardless of their stacking order and coordination difference.

Keywords


Charge Density Wave, Phonon Energy, Superconductivity, Transition-Metal Compound.

References





DOI: https://doi.org/10.18520/cs%2Fv114%2Fi04%2F888-891