Volume 86, Number 2, April 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 May 2009|
Conductance switching and inhomogeneous field melting in the charge ordered manganites
Harish-Chandra Research Institute - Chhatnag Road, Jhusi, Allahabad 211019, India
Corresponding author: firstname.lastname@example.org
Accepted: 18 March 2009
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 rA and cation disorder , 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.
PACS: 75.47.Lx – Manganites / 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
© EPLA, 2009
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