Physics – Condensed Matter – Superconductivity
Scientific paper
2006-09-29
Physica C 460-462 (2007) 107-110.
Physics
Condensed Matter
Superconductivity
7 figs, 4 pages, presented on M2S-HTSC Conference, July 9-14, 2006, Dresden
Scientific paper
10.1016/j.physc.2007.03.166
An overview of the recent efforts in point-contact (PC) spectroscopy of the nickel borocarbide superconductors RNi2B2C in the normal and superconducting (SC) state is given. The results of measurements of the PC electron- boson(phonon) interaction spectral function are presented. Phonon maxima and crystalline-electric-field (CEF) excitations are observed in the PC spectra of compounds with R=Dy, Ho, Er and Tm, while for R=Y a dominant phonon maximum around 12 meV is characteristic. Additionally, non-phonon and non-CEF maxima are observed near 3 meV in R=Ho and near 6 meV in R=Dy. Directional PC study of the SC gap gives evidence for the multi-band nature of superconductivity in R=Y, Lu. At low temperature the SC gap in R=Ho exhibits a standard single-band BCS-like dependence, which vanishes above T_c^*= 5.6K< T_c=8.5K, where a specifc magnetic ordering starts to play a role. For R=Tm (T_c=10.5 K) a decrease of the SC gap is observed below 5 K.
Bashlakov D. L.
Behr Günter
Bobrov N. L.
Chernobay V. N.
Drechsler Stefan-Ludwig
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