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Resistivity, thermoelectric power, heat capacity, and magnetization for samples of RuSr2(Gd1.5Ce0.5)Cu2O10-δ were investigated in the temperature range 1.8–300 K with a magnetic field up to 8 T. The resistive transitions to the superconducting state are found to be determined by the inhomogeneous (granular) structure, characterized by the intragranular, Tc0, and intergranular, Tcg, transition temperatures. Heat capacity, C(T), shows a jump at the superconducting transition temperature Tc0≈37.5 K. A Schottky-type anomaly is found in C(T) below 20 K. This low-temperature anomaly can be attributed to splitting of the ground term 8S7/2 of paramagnetic Gd3+ ions by internal and external magnetic fields. [ABSTRACT FROM AUTHOR]

The in-plane resistance of single crystal non-magnetic Lu[sub x]Y[sub 1-x]Ni[sub 2]B[sub 2]C and magnetic Lu[sub x]Gd[sub 1-x]Ni[sub 2]B[sub 2]C samples as a function of the magnitude and direction of the magnetic field and temperature have been measured. The superconducting upper critical field H[sub c2](T) is anisotropic for both. A positive curvature in H[sub c2](T) near T[sub c](x) is clearly observed only for the non-magnetic impurity. At low temperature H[sub c2](T) for the sample with magnetic impurities is strongly reduced. Thermopower, thermal conductivity and resistivity as a function of temperature are also reported for Lu[sub x]Gd[sub 1-x]Ni[sub 2]B[sub 2]C. [ABSTRACT FROM AUTHOR]