Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819207 | Physica C: Superconductivity and its Applications | 2016 | 7 Pages |
Abstract
In this paper, we undertake a quantitative analysis of observed temperature-dependent in-plane normal state electrical resistivity of single crystal YBa2Cu4O8. The analysis is within the framework of classical electron-phonon i.e., Bloch-Gruneisen model of resistivity. It is based on the inherent acoustic (low frequency) phonons (Ïac) as well as high frequency optical phonons (Ïop), the contributions to the phonon resistivity were first estimated. The optical phonons of the oxygen breathing mode yields a relatively larger contribution to the resistivity compared to the contribution of acoustic phonons. Estimated contribution to in-plane electrical resistivity by considering both phonons i.e., Ïac and Ïop, along with the zero-limited resistivity, when subtracted from single crystal data infers a quadratic temperature dependence over most of the temperature range [80 ⩽ T ⩽ 300]. Quadratic temperature dependence of Ïdiff. = [Ïexp â {Ï0 + Ïeâph (=Ïac + Ïop)}] is understood in terms of electron-electron inelastic scattering. The relevant energy gap expressions within the Nambu-Eliashberg approach are solved imposing experimental constraints on their solution (critical temperature Tc). It is found that the indirect-exchange formalism provides a unique set of electronic parameters [electron-phonon (λph), electron-charge fluctuations (λpl), electron-electron (μ) and Coulomb screening parameter (μ*)] which, in particular, reproduce the reported value of Tc.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Dinesh Varshney, A. Yogi, K.K. Choudhary,