NDLI: Explanation of Temperature-Dependent Resistivity of Sm-Doped Cuprates by Electron

Content Provider	Springer Nature Link
Author	Varshney, Dinesh Choudhary, K. K. Singh, R. K.
Copyright Year	2002
Abstract	The resistivity of electron-doped cuprate Sm$_{1.85}$Ce$_{0.15}$CuO$_{4 − δ}$ is theoretically analyzed within the framework of electron–phonon i.e., Bloch–Gruneisen (BG) model of resistivity. Characteristic temperatures as the Debye temperature and the Einstein temperature were first derived from an overlap repulsive potential. The optical phonons of the oxygen-breathing mode yield a relatively larger contribution to the resistivity compared to the contribution of acoustic phonons above 220 K. While to that, below this temperature, acoustic phonon is a major cause of resistivity. Estimated contribution to resistivity by considering both phonons i.e., ω$_{ac}$ (acoustic phonons) and ω$_{op}$ (optical phonons), along with the zero limited resistivity, when subtracted from single crystal data, infers a quadratic temperature dependence over most of the temperature range (25 ≤ T ≤ 300). Power temperature dependence of ρ $_{diff.}${=[ρ $_{exp.}$ – (ρ $_{0}$ + ρ $_{e-ph}$(=ρ $_{ac}$ + ρ $_{op}$))]} points the contribution of electron–electron inelastic scattering. The present analysis allows us to infer that the single crystal experimental data is well approximated within the framework of BG electron–phonon model of resistivity. Further calculations of superconducting transition temperature and isotope effect exponent from Kresin's strong coupling theory indicates that the electron–phonon interaction plays an important role in the attractive pairing mechanism.
Starting Page	281
Ending Page	293
Page Count	13
File Format	PDF
ISSN	08961107
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	15
Issue Number	4
e-ISSN	15729605
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Characterization and Evaluation Materials Condensed Matter Solid State Physics and Spectroscopy
Content Type	Text
Resource Type	Article
Subject	3100/3101 Condensed Matter Physics Electronic, Optical and Magnetic Materials

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