Electron-Phonon Coupling Origin of the resistivity in YNi_{2}B_{2}C Single Crystals

Details Electron-Phonon Coupling Origin of the resistivity in YNi_{2}B_{2}C Single Crystals Electron-Phonon Coupling Origin of the resistivity in YNi_{2}B_{2}C Single Crystals

2000-07-03

arxiv.org/abs/cond-mat/0007033v1

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures. Proceedings of SATT10 Conference, to be published in Int. J. Mod. Phys. B

Scientific paper

10.1142/S0217979200002983

Resistivity measurements from 4.2 K up to 300 K were made on YNi_{2}B_{2}C single crystals with Tc=15.5 K. The resulting rho(T) curve shows a perfect Bloch-Grueneisen (BG) behavior, with a very small residual resistivity which indicates the low impurity content and the high cristallographic quality of the samples. The value lambda_{tr}=0.53 for the transport electron-phonon coupling constant was obtained by using the high-temperature constant value of d(rho)/dT and the plasma frequency reported in literature. The BG expression for the phononic part of the resistivity rho_{ph}(T) was then used to fit the data in the whole temperature range, by approximating alpha^{2}_{tr}F(Omega) with the experimental phonon spectral density G(Omega) multiplied by a two-step weighting function to be determined by the fit. The resulting fitting curve perfectly agrees with the experimental points. We also solved the real-axis Eliashberg equations in both s- and d-wave symmetries under the approximation alpha^{2}F(Omega)= alpha^{2}_{tr}F(Omega). We found that the value of lambda_{tr} here determined in single-band approximation is quite compatible with Tc and the gap Delta experimentally observed. Finally, we calculated the normalized tunneling conductance, whose comparison with break-junction tunnel data gives indication of the possible s-wave symmetry for the order parameter in YNi_{2}B_{2}C.

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