Surface impedance studies of PrT4Sb12 (T = Os, Ru)

摘要

RF surface impedance measurements Z(s) = R-s + iX(s), where R-s and X-s are the surface resistance and surface reactance, respectively, were carried out for high-quality single crystals PrOs4Sb12 and PrRu4Sb12. In PrOs4Sb12, both R-s and X-s exhibit unusual field dependence with a significant suppression around the AB phase boundary reported by the thermal conductivity measurements; R, and X-s have a kink at 0.4H(c2). This feature is different markedly from those in PrRu4Sb12 which is reported to be a s-wave Superconductor. (c) 2006 Elsevier B.V. All rights reserved.