High-field history dependence of magnetization and resistivity in phase-separated Y_0.2Ca_0.8MnO₃

We studied the high-field history dependence of magnetization and resistivity of Y_0.2Ca_0.8MnO₃ in the frame of magnetic and structural phase transitions. With increasing magnetic fields, the difference between field-cooled and zero-field-cooled data becomes increasingly large, and the onset temperature of the difference shifts toward high temperatures. The x-ray diffraction and electron spin resonance measurements reveal that the orthorhombic paramagnetic phase disappears, and the orthorhombic ferromagnetic and monoclinic antiferromagnetic phases coexist below ∼120 K. Based on these results, a phenomenological model was proposed to explain the high-field history dependent behavior.