Possible manifestation of spin fluctuations in the temperature behavior of resistivity in Sm_{1.85}Ce_{0.15}CuO_4 thin films

Abstract

A pronounced step-like (kink) behavior in the temperature dependence of resistivity $\rho (T)$ is observed in the optimally-doped $S{m}_{1.85}C{e}_{0.15}Cu{O}_4$ thin films around $T_{sf}=87K$ and attributed to manifestation of strong spin fluctuations induced by $S{m}^{3+}$ moments with the energy $\hslash {\omega }_{sf}=k_B{T}_{sf}\simeq 7meV$. In addition to fluctuation induced contribution ${\rho }_{sf}(T)$ due to thermal broadening effects (of the width ${\omega }_{sf}$), the experimental data are found to be well fitted accounting for residual (zero-temperature) ${\rho }_{res}$, electron-phonon ${\rho }_{e-ph}(T)=AT$ and electron-electron ${\rho }_{e-e}(T)=B{T}^2$ contributions. The best fits produced ${\omega }_p=2.1meV$, ${\tau }_0^{-1}=9.5\times 10^{-14}{s}^{-1}$, $\lambda =1.2$, and $E_F=0.2eV$ for estimates of the plasmon frequency, the impurity scattering rate, electron-phonon coupling constant, and the Fermi energy, respectively.

arXiv comment6 pages (REVTEX4), 2 EPS figures; accepted for publication in JETP Letters

References in corpus (11)

• Spin correlations in the electron-doped high-transition-temperature superconductor Nd{2-x}Ce{x}CuO{4+/-delta}
• Evidence for a quantum phase transition in the electron-doped cuprate Pr2-xCexCuO4+d from Hall and resistivity measurements
• Superconducting Gap Anisotropy in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$: Results from Photoemission
• Evidence for a Transition in the Pairing Symmetry of the Electron-Doped Cuprates La_{2-x}Ce_xCuO_{4-y} and Pr_{2-x}Ce_xCuO_{4-y}
• "Spin-Flop" Transition and Anisotropic Magnetoresistance in Pr_{1.3-x}La_{0.7}Ce_{x}CuO_{4}: Unexpectedly Strong Spin-Charge Coupling in Electron-Doped Cuprates
• Evolution of the low energy spin dynamics in electron-doped high-transition temperature superconductor Pr0.88LaCe0.12CuO4-d
• Optical determination of the superconducting energy gap in electron-doped Pr_{1.85}Ce_{0.15}CuO_4
• Infrared Signature of the Superconducting State in Pr(2-x)Ce(x)CuO(4)
• Magnetic field dependence of the low-temperature specific heat of the electron-doped superconductor Pr1.85Ce0.15CuO4
• Field-dependent diamagnetic transition in magnetic superconductor $S{m}_{1.85}C{e}_{0.15}Cu{O}_{4-y}$
• Probing pairing symmetry of Sm_{1.85}Ce_{0.15}CuO_4 via highly-sensitive voltage measurements: Evidence for strong impurity scattering

Cited by in corpus (2)

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• Evidence for resonant scattering of electrons by spin fluctuations in $LaNi{O}_3/LaAl{O}_3$ heterostructures grown by pulsed laser deposition