Staircase effect in metamagnetic transitions of charge and orbitally ordered manganites

Abstract

This paper reports on peculiar metamagnetic transitions which take place in antiferromagnetic, charge and orbitally ordered (AFCOO) manganites. At very low temperatures, the virgin magnetization curves of some of these compounds exhibit several, sharp steps giving rise to a staircase-like shape. This staircase effect is shown to be sensitive to various experimental parameters. Several potential interpretations of the staircase effect are discussed in relation to this set of results. A martensitic-like scenario, involving a leading role of the structural distortions associated to the collapse of the orbital ordering, is found to be the most plausible interpretation.

To be published in J. Mag. Mag. Mat

References in corpus (3)

• Martensitic accommodation strain and the metal-insulator transition in manganites
• On the athermal character of structural phase transitions
• Instability of metal-insulator transition against thermal cycling in phase separated Cr-doped manganites

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• A Real Space Description of Magnetic Field Induced Melting in the Charge Ordered Manganites: I. The Clean Limit
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