Competing Orders and Disorder-induced Insulator to Metal Transition in Manganites

Abstract

Effects of disorder on the two competing phases, i.e., the ferromagnetic metal and the commensurate charge/lattice ordered insulator, are studied by Monte Carlo simulation. The disorder suppresses the charge/lattice ordering more strongly than the ferromagnetic order, driving the commensurate insulator to the ferromagnetic metal near the phase boundary in the pure case. Above the ferromagnetic transition temperature, on the contrary, the disorder makes the system more insulating, which might cause an enhanced colossal magnetoresistance as observed in the half-doped or Cr-substituted manganites. No indication of the percolation or the cluster formation is found, and there remain the charge/lattice fluctuations instead which are enhanced toward the transition temperature.

5 pages including 4 figures

Cited by in corpus (24)

• Competing Ferromagnetic and Charge-Ordered States in Models for Manganites: the Origin of the CMR Effect
• Transport properties in manganite thin films
• Insulator to Metal Transition Induced by Disorder in a Model for Manganites
• The Distinct Effects of Homogeneous Weak Disorder and Dilute Strong Scatterers on Phase Competetion in the Manganites
• Colossal Magnetoresistance Observed in Monte Carlo Simulations of the One- and Two-Orbital Models for Manganites
• Phase competition in the double-exchange model on the frustrated pyrochlore lattice
• Highly anisotropic resistivities in the double-exchange model for strained manganites
• Disorder-Induced First Order Transition and Curie Temperature Lowering in Ferromagnatic Manganites
• Study of Short-distance Spin and Charge Correlations and Local Density-of-States in the CMR regime of the One-Orbital Model for Manganites
• Non-magnetic B-site Impurities Induce Ferromagnetic Tendencies in CE Manganites
• Fragility of the A-type AF and CE Phases of Manganites: An Exotic Insulator-to-Metal Transition Induced by Quenched Disorder
• Study of the One- and Two-Band Models for Colossal Magnetoresistive Manganites Using the Truncated Polynomial Expansion Method
• Equilibrium tuned by a magnetic field in phase separated manganite
• Combined Effect of Bond- and Potential-Disorder in Half-Doped Manganites
• Dilution effect in correlated electron system with orbital degeneracy
• Fe-doping-induced evolution of charge-orbital ordering in a bicritical-state manganite
• Dopant-dependent impact of Mn-site doping on the critical-state manganites: R0.6Sr0.4MnO3 (R=La, Nd, Sm, and Gd)
• Relevance of quantum fluctuations in the Anderson-Kondo model
• Interplay between thermal percolation and jamming upon dimer adsorption on binary alloys
• The Effect of Disorder in an Orbitally Ordered Jahn-Teller Insulator
• Disorder-induced orbital ordering in doped manganites
• An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites
• Re-entrant Behavior and Gigantic Response in Disordered Spin-Peierls System
• Entropy-Driven Reentrant Behavior in CMR Manganites