Abstract

The magnetic properties of Nd_0.85Sr_0.15CoO₃ have been systematically investigated by dc magnetization, ac susceptibility and magnetic relaxation. The dynamics scaling analysis of ac susceptibility and magnetic relaxation give sufficient evidence of the existence of a spin-glass phase, which can be ascribed to the complicated interactions among Co³⁺ and Co⁴⁺ ions in this phase-separated compound. The field-cooled magnetic hysteresis loop displays both horizontal and vertical shifts, i.e., the exchange bias effect, while no shifts are present with increase of the measuring field up to ±50 kOe. The results further sustain the picture of the spin-glass phase coexisting with other magnetic regions in the sample.

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