Abstract
The coexistence of ferromagnetic metallic and antiferromagnetic charge-ordered (CO) states in ${\mathrm{Pr}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ has been investigated using zero-field muon spin relaxation, neutron diffraction, calorimetric, and magnetic measurements. Calorimetric data evidence a high degree of disorder below the CO transition. The data are consistent with large antiferromagnetic (AFM) CO regions containing structural and magnetic inhomogeneities densely scattered. Below the charge order temperature ${(T}_{\mathrm{CO}}\ensuremath{\approx}220\mathrm{K})$ the dominant relaxation mechanism of the muon polarization is based on ferromagnetic Mn-Mn correlations and the spin-lattice relaxation rate is peaked at ${T}_{C}$ instead of ${T}_{N}.$ The results agree with a spatial distribution of ferromagnetic and AFM regions strongly interpenetrated. The presence of local magnetic order in the whole sample is only achieved just below ${T}_{C}\ensuremath{\approx}120\mathrm{K}.$
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