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Point-contact spectroscopy of the nickel borocarbide superconductors RNi2B2C (R=Y, Dy, Ho, Er, Tm, Lu) | | Yu. G. Naidyuk
; D. L. Bashlakov
; N. L. Bobrov
; V. N. Chernobay
; O. E. Kvitnitskaya
; I. K. Yanson
; G. Behr
; S.-L. Drechsler
; G. Fuchs
; D. Souptel
; D. G. Naugle
; K. D. D. Rathnayaka
; J. H. Ross Jr
; | | Date: |
29 Sep 2006 | | Subject: | Superconductivity | | Abstract: | 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. | | Source: | arXiv, cond-mat/0609771 | | Services: | Forum | Review | PDF | Favorites | |
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