Metallic ferromagnetism-insulating charge order transition in doped manganites
arXiv:1604.01511 · doi:10.1103/PhysRevB.93.165115
Abstract
We show that an interplay of double exchange and impurity randomness can explain the competition between metal-ferromagnetic and insulating charge ordered states in doped manganites. The double exchange is simplified in the Ising type, whereas the randomness is modeled by the Falicov-Kimball binary distribution. The combined model is considered in a framework of dynamical mean-field theory. Using the Kubo-Greenwood formalism, the transport coefficients are explicitly expressed in terms of single particle spectral functions. Dividing the system into two sublattices we have pointed out a direct calculation to the checkerboard charge order parameter and the magnetizations. Numerical results show us that the checkerboard charge order can settle inside the ferromagnetic state at low temperature. An insulator-metal transition is also found at the point of the checkerboard charge order-ferromagnetic transition.
arXiv comment9 pages, 6 figures
References in corpus (13)
- Colossal Magnetoresistant Materials: The Key Role of Phase Separation
- Exact solution of the Falicov-Kimball model with dynamical mean-field theory
- Charge ordered ferromagnetic phase in La0.5Ca0.5MnO3
- The Hubbard Model at Infinite Dimensions: Thermodynamic and Transport Properties
- Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons
- Dynamical mean-field theory of a double-exchange model with diagonal disorder
- Optical and dc transport properties of a strongly correlated charge density wave system: exact solution in the ordered phase of the spinless Falicov-Kimball model with dynamical mean-field theory
- Universal thermopower of bad metals
- Spin dependence of ferroelectric polarization in the double exchange model for manganites
- Charge-ordered ferromagnetic phase in manganites
- Doping change and distortion effect on double-exchange ferromagnetism
- Transport properties in Simplified Double Exchange model
- Dynamical Mean-Field Solution for a Model of Metal-Insulator Transitions in Moderately Doped Manganites