Isotope shift exponent in two-band high-Tc superconductors with linear-energy-dependent electronic density of states

Okoye, C.M.I.

doi:10.1016/s0921-4534(98)00685-6

Cited by 13 publications

(2 citation statements)

References 69 publications

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“…Let V ph represent the attractive-phonon interaction and U c represent the Coulomb repulsion interaction, either of which possesses a characteristic cutoff energy associated with the Debye phonon (ω D ) and Coulomb (ω c ), respectively. Then, the interaction potential of carrier V kk is [26][27][28]…”

Section: Methodsmentioning

confidence: 99%

The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors

Tongkhonburi,

Udomsamuthirun,

Changjan

et al. 2024

Crystals

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This study investigates the gap-to-Tc ratio (R) of yttrium hydride superconductors within the weak coupling limit. We derived an analytical formula for the gap-to-Tc ratio. The ratio of the gap-to-Tc is dependent on the pressure applied to each superconductor. The maximum ratio, approximately 3.85, is observed in one superconductor, while the lowest ratio, roughly 3.21, is found in another superconductor. Based on the findings of our study, it can be deduced that yttrium hydride superconductors exhibit attributes commonly associated with weak-coupling superconductors. The influence of the Coulomb potential is more pronounced at a critical temperature compared to the ratio of the gap to the critical temperature.

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Section: Methodsmentioning

confidence: 99%

The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors

Tongkhonburi,

Udomsamuthirun,

Changjan

et al. 2024

Crystals

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“…First principle calculations show overlapping energy bands at the Fermi level [15]. The short coherence length observed in high-T c superconductors, has been related to the presence of overlapping energy bands [16,17]. A simple model with generalized Fermi surface topologies via band overlapping has been proposed based on indirect experimental evidence.…”

Section: Introductionmentioning

confidence: 99%

D-wave overlapping band model for cuprate superconductors

Orozco,

Méndez-Moreno,

Ortiz

et al. 2009

Preprint

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Within the BCS framework a multiband model with d-wave symmetry is considered. Generalized Fermi surface topologies via band overlapping are introduced. The band overlap scale is of the order of the Debye energy. The order parameters and the pairing have d-wave symmetry. Experimental values reported for the critical temperatures Tc(x) and the order parameters, ∆0(x), in terms of dopping x are used. Numerical results for the coupling and the band overlapping parameters in terms of the doping are obtained for the cuprate superconductor La2−xSrxCuO4.

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Effect of interband interaction on isotope effect exponent of MgB2 superconductors

et al. 2006

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The exact formula of T c 's equation and the isotope effect exponent of twoband s-wave superconductors in weak-coupling limit are derived by considering the influence of interband interaction . The paring interaction in each band consisted of 2 parts : the electron-phonon interaction and non-electron-phonon interaction are included in our model. The isotope effect exponent of MgB 2 , 3 . 0 = α with 40 T c ≈ K ,can be found in the weak coupling regime and interband interaction of electron-phonon interaction show more effect on isotope effect exponent than of nonphonon interaction .

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Isotope shift exponent in two-band high-Tc superconductors with linear-energy-dependent electronic density of states

Cited by 13 publications

References 69 publications

The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors

The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors

D-wave overlapping band model for cuprate superconductors

Effect of interband interaction on isotope effect exponent of MgB2 superconductors

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