Characteristic crossing point (T(*)2.7K) in specific heat curves of samples RuSr(2)Gd(1.5)Ce(0.5)Cu(2)O(10-) taken for different values of magnetic field.
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abstract
Magnetic properties of polycrystalline samples of RuSr(2)(Gd(1.5)Ce(0.5))Cu(2)O(10-), as-prepared (by solid-state reaction) and annealed (12h at 845C) in pure oxygen at different pressure (30, 62 and 78atm) are presented. The specific heat and magnetization were investigated in the temperature range 1.8-300K with a magnetic field up to 8T. The specific heat, C(T), shows a jump at the superconducting transition (with an onset at T37.5K). Below 20K, a Schottky-type anomaly becomes apparent in C(T). 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. It is found that curves C(T) taken for different values of magnetic field have the same crossing point (at T(*)2.7K) for all the samples studied. At the same time, C(H) curves taken for different temperatures have a crossing point at a characteristic field H(*)3.7T. These effects can be considered as a manifestation of the crossing point phenomenon which is supposed to be inherent for strongly correlated electron systems.
