Abstract
We report a detailed study on the effects of magnetic field annealing on the magnetic and transport properties of single crystals of Pr 1− x Ca x MnO 3 with x = 0.2 – 0.4 . Below the Néel temperature, the samples with 0.3 ≤ x ≤ 0.35 undergo a typical metamagnetic transition from antiferromagnetic (AFM) to ferromagnetic (FM) upon applying a field of about 3 T. After the first metamagnetic transition, remarkably, the critical field of the second metamagnetic transition is increased by about 1 T, suggesting that the AFM phase is stabilized by the magnetic field-annealing. This field-stabilized AFM phase might be attributed to the coexistence of inhomogeneous FM and AFM phases near the phase boundary that are strongly dependent upon a magnetic field. A general phase diagram of Pr 1− x Ca x MnO 3 is thus modified on the basis of irreversible magnetic transitions.
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