Coulomb interactions and nanoscale electronic inhomogeneities in manganites.
We study electronic inhomogeneities in manganites using simulations on a microscopic model with Coulomb interactions amongst two electronic fluids-one localized (polaronic), the other extended-and dopant ions. The long range Coulomb interactions frustrate phase separation induced by the large on site repulsion between the fluids. A single phase ensues which is inhomogeneous at a nanoscale, but homogeneous on mesoscales, with many features that agree with experiments. This, we argue, is the origin of nanoscale inhomogeneities in manganites, rather than phase competition or disorder effects.
Shenoy
Vijay B
VB
Centre For Condensed Matter Theory, Indian Institute of Science, Bangalore 560 012, India.
Gupta
Tribikram
T
Krishnamurthy
H R
HR
Ramakrishnan
T V
TV