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An general survey of the superconducting (SC) gap study in the titlecompounds by point-contact (PC) spectroscopy is presented. The SC gap wasdetermined from dV/dI of PCs employing the well-known theory of conductivityfor normal metal-superconductor PCs accounting Andreev reflection. The theorywas modified by including pair-breaking effects considering the presence ofmagnetic rare-earth ions. A possible multiband structure of these compounds wasalso taken into account. The PC study of the gap in the Er-compound(TN=6K<Tc=11K) gives =evidence for the presence of two SC gaps. Additionally, adistinct decrease of both gaps is revealed for R = Er in the antiferromagnetic(AF) state. For R = Tm (TN=1.5K<Tc=10.5K) a decrease of the SC gap is observedbelow 4-5K, while for R = Dy (TN=10.5K>Tc=6.5K) the SC gap has a BCS-likedependence in the AF state. The SC gap for R = Ho (TN=5.2K<Tc=8.5K) exhibitsbelow T*=5.6K a single-band BCS-like dependence vanishing above T*, where aspecific magnetic order occurs. The difference in the SC gap behavior in thetitle compounds is attributed to different AF ordering.

journal of physics. conference series

The Superconducting Gap Behavior in the Antiferromagnetic  Nickel-Borocarbide Compounds RNi2B2C (R=Dy, Ho, Er, Tm) Studied by  Point-Contacts Spectroscopy