DOI: 10.1209/0295-5075/86/27003
Conductance switching and inhomogeneous field melting in the charge ordered manganites
Anamitra Mukherjee, Kalpataru Pradhan and Pinaki MajumdarHarish-Chandra Research Institute - Chhatnag Road, Jhusi, Allahabad 211019, India
anam@mri.ernet.in
received 12 November 2008; accepted in final form 18 March 2009; published April 2009
published online 4 May 2009
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 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.
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