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Effect of Gap Parameter on Electronic Heat Capacity and Magnetic Susceptibility of Graphene in the Presence of Holstein Phonons

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Abstract

Thermodynamic properties of gapped graphene-like structures by considering the effects of interaction between electrons and Holstein phonons have been studied. Particularly, we study the heat capacity and paramagnetic susceptibility of structures as a function of temperature within the Green’s function method with the help of Holstein model. The paramagnetic susceptibility and heat capacity can be derived by using density of states based on the Kubo formula. We have found the energy dependence of density of states for various values of gap in the presence of Holstein phonons. Finally, the temperature behaviors of specific heat and spin susceptibility of gapped graphene structure due to electron-phonon coupling have been investigated. Our results show the electron-phonon interaction leads to the appearance of a double van Hov singularity for each value of gap parameter. Also, electron-phonon coupling affects the value of heat capacity and magnetic susceptibility at low temperatures.

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Authors and Affiliations

  1. Department of Physics, Razi University, Kermanshah, Iran

    Hamed Rezania

  2. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Mohsen Yarmohammadi

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  1. Hamed Rezania
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  2. Mohsen Yarmohammadi
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Correspondence to Hamed Rezania.

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Rezania, H., Yarmohammadi, M. Effect of Gap Parameter on Electronic Heat Capacity and Magnetic Susceptibility of Graphene in the Presence of Holstein Phonons. J Supercond Nov Magn 31, 1293–1299 (2018). https://doi.org/10.1007/s10948-017-4300-5

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  • DOI: https://doi.org/10.1007/s10948-017-4300-5

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