The dynamic response of (Formula presented) crystals (Formula presented) and 0.125) has been studied by ac susceptibility. A strongly frequency- and field-dependent susceptibility anomaly was observed along a and b axes in the intermediate temperature range between the onset of magnetic order and the orthorhombic-“pseudocubic,” (Formula presented) structural transition. No anomaly was present if the ac field was applied along the c axis. This unusual response, reminiscent of cluster-glass behavior, is attributed to a strongly anisotropic, magnetically nonuniform state. This observation would constitute a clear indication of phase separation in low-doped manganites. © 2000 The American Physical Society.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1 Jan 2000|