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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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  • Kadijk, F. and Jellinek, F., On the polymorphism of niobium diselenide. J. Less Common Met., 1971, 23, 437–441.

  • Naito, M. and Tanaka, S., Electrical transport properties in 2H-NbS2, -NbSe2, -TaS2 and –TaSe2. J. Phys. Soc. Jpn., 1982, 51, 219–227.

  • Naik, I. and Rastogi, A. K., Charge density wave and superconductivity in 2H- and 4H-NbSe2: a revisit. Pramana – J. Phys., 2011, 76(6), 957–963.

  • Doran, N. J., Ricco, B., Schreiber, M., Titterington, D. and Wexler, G., The electronic susceptibility and charge density waves in 2H-NbSe2 layered compound. J. Phys. C, 1978, 11, 699–705.

  • Rice, T. M. and Scott, G. K., New mechanism for a charge density wave instability. Phys. Rev. Lett., 1975, 35, 120–123.

  • Moncton, D. E., Axe, J. D. and Disalvo, F. J., Neutron scattering study of the charge density wave transitions in 2H-TaSe2 and 2H-NbSe2. Phys. Rev. B, 1977, 16, 801–819.

  • Giambattista, B., Johnson, A., Coleman, R. V., Drake, B. and Hansma, P. K., Charge density wave observed at 4.2 K by scanningtunneling microscopy. Phys. Rev. B, 1988, 37, 2741–2744.

  • Berthier, C., Jerome, D. and Molinie, P., NMR study on a 2H-NbSe2 single crystal: A microscopic investigation of the charge density wave states. J. Phys. C, 1978, 11, 797–814.

  • Du, C-H. et al., X-ray scattering studies of 2H-NbSe2, a superconductor and charge density wave material, under high external magnetic fields. J. Phys.: Condens. Matter, 2000, 12, 5361–5370.

  • Li, L., Xu, Z., Shen, J., Qiu, L. and Gan, Z., Effect of charge density wave transition on the transport properties of 2H-NbSe2. J. Phys.: Condens. Matter, 2005, 17, 493–498.

  • Naik, I. and Rastogi, A. K., Transport properties of 2H-NbSe2: effect of Ga-intercalation. Physica B, 2010, 405, 955–957.

  • Thompson, A. H., Pauling’s ionicity and charge density wave in layered transition metal dichalcogenides. Phys. Rev. Lett., 1975, 34, 520–524.

  • Chu, C. W., Diatschenko, V., Huang, C. Y. and Disalvo, F. J., Pressure effect on the charge density wave formation on 2H-NbSe2 and correlation between structural instabilities and superconductivity in unstable solids. Phys. Rev. B, 1977, 15, 1340–1342.

  • McMillan, W. L., Transition temperatures of strong-coupled superconductors. Phys. Rev., 1968, 167, 331–344.

  • Allen, P. B. and Dynes, R. C., Transition temperature of strongcoupled superconductors reanalyzed. Phys. Rev. B, 1975, 12, 905–922.

  • Louie, S. G. and Cohen, M. L., Superconducting transition temperatures for weak and strong electron–phonon coupling. Solid State Commun., 1977, 22, 1–4.

  • Berlinsky, A. J., One-dimensional metals and charge density wave effects in these materials. Rep. Prog. Phys., 1979, 42, 1243–1283.

  • Ayache, C., Currat, R. and Molinie, P., Study of the mode softening in NbSe2-2H. Physica B, 1992, 180–181, 333–335.

  • Weber, F. et al., Extended phonon collapse and the origin of the charge density wave in 2H-NbSe2. Phys. Rev. Lett., 2011, 107, 107403-(1-5).

  • Schmalzl, K., Strauch, D., Hiess, A. and Berger, H., Temperature dependent phonon dispersion in 2H-NbSe2 investigated using inelastic neutron scattering. J. Phys.: Condens. Matter, 2008, 20, 104240-(1-3).


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

Abstract Views: 321  |  PDF Views: 98

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