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Crossing point phenomena are one of the interesting and still puzzlingeffects in strongly correlated electron systems. We have synthesizedRuSr2Gd1.4Ce0.6Cu2O10-{\delta} (GdRu-1222) magneto-superconductor throughstandard solid state reaction route and measured its magnetic, transport andthermal properties. We also synthesized RuSr2Eu1.4Ce0.6Cu2O10-{\delta}(EuRu-1222) then measured its heat capacity in zero magnetic fields forreference. The studied compounds crystallized in tetragonal structure withspace group I4/mmm. GdRu-1222 is a reported magneto-superconductor with Ruspins magnetic ordering at temperature around 110 K and superconductivity inCu-O2 planes below around 40 K. To explore the crossing point phenomena, thespecific heat [Cp (T)] was investigated in temperature range 1.9-250 K, undermagnetic field of up to 70 kOe. Unfortunately though no magnetic andsuperconducting transitions are observed in specific heat, a Schottky typeanomaly is observed at low temperatures below 20 K. This low temperatureSchottky type anomaly can be attributed to splitting of the ground statespectroscopic term 8S7/2 of paramagnetic Gd3+ ions by both internal andexternal magnetic fields. It was also observed that Cp (T) being measured fordifferent values of magnetic field, possesses the same crossing point (T* = 2.7K), up to the applied magnetic field 70 kOe. A quantitative explanation of thisphenomenon, based on its shape and temperature dependence of the associatedgeneralized heat capacity (Cp), is presented. This effect supports the crossingpoint phenomena, which is supposed to be inherent for strongly correlatedsystems.

Crossing point phenomena (T* = 2.7 K) in specific heat curves of superconducting ferromagnets RuSr2Gd1.4Ce0.6Cu2O10-{\delta}