High-field history dependence of magnetization and resistivity in phase-separatedY0.2Ca0.8MnO3

Abstract

We studied the high-field history dependence of magnetization and resistivity of ${\mathrm{Y}}_{0.2}{\mathrm{Ca}}_{0.8}\mathrm{Mn}{\mathrm{O}}_{3}$ 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 $\ensuremath{\sim}120\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Based on these results, a phenomenological model was proposed to explain the high-field history dependent behavior.