Low-temperature behavior of specific heat curves in ruthenocuprate RuSr2Gd1.5Ge0.5Cu2O10 : Superconducting, magnetic and crossing-point effects
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Magnetic and superconducting properties of polycrystalline samples of RuSr2Gd1.5Ce0.5Cu2O (10 - ), asprepared (by solid-state reaction) and annealed in pure oxygen at different pressure are presented. Specific heat and magnetization were investigated in the temperature range 1.8-300 K with a magnetic field up to 8 T. Specific heat, C (T), shows a jump at the superconducting transition (with onset at T 37.5 K) and a Schottky-type anomaly below 20 K. It is found that curves C(T) taken for different values of magnetic field have the same crossing point (at T * 2.7 K) for all samples studied. At the same time, C(H) curves taken for different temperatures have a crossing point at a characteristic field H * 3.7 T. These effects are manifestations of the crossing-point phenomenon, which is supposed to be inherent for strongly correlated electron systems. 2010 Allerton Press, Inc.
Bulletin of the Russian Academy of Sciences: Physics
author list (cited authors)
Belevtsev, B. I., Krasovitsky, V. B., Naugle, D. G., Rathnayaka, K., Agnolet, G., & Felner, I.