Electronic Transport and Magnetic Properties in Y $_{0.125}$ Ca ${\rm }_{0.875}$ MnO

A rare-earth-like manganite Y_0.125Ca_0.875MnO₃ was systemically studied by the structure, electric and magnetic measurement. The results show that there exists a considerable magnetoresistance effect in this system. And two transitions are found on electrical transport corresponding to conventional metal-insulator (M-I) transition and Kondo-like behavior. From the magnetization in the zero-field-cooled (ZFC) and field-cooled (FC), a large irreversibility was observed with a cusp at 108 K about considered as spin-glass freezing temperature. Below 108 K, a coexistence of ferromagnetic spin-glass and ferromagnetic ordering phase appears, which indicates a long-range ferromagnetic behavior in spin-glass state. These suggest an intrinsic ferromagnetic spin-glass state in the Y_0.125Ca_0.875MnO₃ system at low temperatures and may be suppressed with applied higher field of about 8.0 Tesla.