Conductance Switching and Inhomogeneous Field Melting in the Charge Ordered Manganites

Abstract

The field induced switching of conductance in the charge ordered half-doped manganites is controlled by the combination of metastability, an inhomogeneous high field state, and cation disorder. We study this non-equilibrium problem via real space Monte Carlo on a disordered strong coupling model appropriate to the manganites. We reproduce the variation of the switching fields with the mean ionic radius r_A and cation disorder σ_A, and demonstrate how the experimental features arise from the proximity of several phases in the Landau free energy landscape. Our prediction for the field melted state is consistent with a growing body of experimental evidence.

5 pages, pdflatex, 5 png figures To appear in Europhys. Lett

References in corpus (3)

• Relating supercooling and glass-like arrest of kinetics for phase separated systems: studies on doped CeFe${}_2$ and (La,Pr,Ca)MnO${}_3$
• The Distinct Effects of Homogeneous Weak Disorder and Dilute Strong Scatterers on Phase Competetion in the Manganites
• Combined Effect of Bond- and Potential-Disorder in Half-Doped Manganites

Cited by in corpus (2)

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