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We report structural, DC magnetization, detailed linear/non-linear ACsusceptibility, (with applied frequency and amplitude) isothermal andthermoremanent magnetization (TRM) behavior for RuSr2Y1.5Ce0.5Cu2O10 (YRu-1222)magneto-superconductor to understand its complex magnetism. Studied sample issynthesized through the novel solid state High Pressure (6 GPa) HighTemperature (1450oC) (HPHT) technique. The compound is crystallized intetragonal structure with space group I4/mmm (No. 139). DC magneticsusceptibility shows that studied YRu-1222 is magneto-superconducting with Ruspins magnetic ordering at around 110 K and superconductivity (SC) in the Cu-O2planes below ~ 30 K. Frequency and field dependent detailed AC magneticsusceptibility measurements confirms the spin-glass (SG) behavior withhomogeneous/non-homogeneous ferromagnetic (FM) clusters in this system.Variation of cusp position with applied AC frequency follows the famousVogel-Fulcher law, which is commonly accepted feature for spin-glass (SG)system with homogeneous/non-homogeneous ferromagnetic clusters embedded inspin-glass (SG) matrix. Above the freezing temperature (Tf), first and thirdharmonics AC susceptibility analysis indicated possibility of the co-existenceof spin cluster ferromagnetism with superparamagnetism (SPM). The M-H loops atlow temperature exhibit the ferromagnetic behavior with rather small coercivefield (Hc) and remnant magnetization (Mr). Summarily, the magnetic (DC and AC)susceptibility measurements and their analysis have enabled us to unearth thecomplex magnetism in terms of successive SG-FM-SPM transitions withtemperature.

Successive spin glass, cluster ferromagnetic, and superparamagnetic transitions in RuSr2Y1.5Ce0.5Cu2O10 complex magneto-superconductor