Transport, thermal and magnetic properties of RuSr_2(Gd_{1.5}Ce_{0.5})Cu_2O_{10-δ}, a magnetic superconductor

Abstract

Resistivity, thermoelectric power, heat capacity and magnetization for samples of RuSr_2(Gd_{1.5}Ce_{0.5})Cu_{2}O_{10-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, T_{c0}, and intergranular, T_{cg}, transition temperatures. Heat capacity, C(T), shows a jump at the superconducting transition temperature T_{c0}\approx 37.5 K. A Schottky-like anomaly is found in C(T) below 20 K. This low temperature anomaly can be attributed to splitting of the ground term ${}^8{S}_{7/2}$ of paramagnetic Gd^{3+} ions by internal and external magnetic fields.

3 pages (4 figs. incl.), reported at 50th Magnetism and Magnetic Materials Conference, San Jose, CA, USA, 2005

References in corpus (1)

• The internal magnetic field in superconducting ferromagnets

Cited by in corpus (6)

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• Search for Magnetic Order in Superconducting RuSr2Eu1.2Ce0.8Cu2O10
• Characteristic crossing point ($T_{\ast }\approx 2.7$ K) in specific-heat curves of samples RuSr${}_2$Gd${}_{1.5}$Ce${}_{0.5}$Cu${}_2$O${}_{10-\delta }$ taken for different values of magnetic field
• Crossing point phenomena (T* = 2.7 K) in specific heat curves of superconducting ferromagnets RuSr2Gd1.4Ce0.6Cu2O10-δ
• Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$