Competition of Zener and polaron phases in doped CMR manganites
arXiv:cond-mat/0101235 · doi:10.1103/PhysRevB.64.104413
Abstract
Inspired by the strong experimental evidence for the coexistence of localized and itinerant charge carriers close to the metal-insulator transition in the ferromagnetic phase of colossal magnetoresistive manganese perovskites, for a theoretical description of the CMR transition we propose a two-phase scenario with percolative characteristics between equal-density polaron and Zener band-electron states. We find that the subtle balance between these two states with distinctly different electronic properties can be readily influenced by varying physical parameters, producing various ``colossal'' effects, such as the large magnetization and conductivity changes in the vicinity of the transition temperature.
arXiv comment8 pages, 5 figures
References in corpus (28)
- Colossal Magnetoresistant Materials: The Key Role of Phase Separation
- Double Exchange Alone Does Not Explain the Resistivity of
- Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in
- Unconventional Ferromagnetic Transition in La1-xCaxMnO3
- High Temperature Thermopower in La_{2/3}Ca_{1/3}MnO_3 Films: Evidence for Polaronic Transport
- Explanation of Giant Cluster Coexistence in Doped Manganites and Other Compounds
- Hall-Effect Sign Anomaly and Small-Polaronic Conduction in (La_{1-x}Gd_x)_{0.67}Ca_{0.33}MnO_3
- Carrier Density Collapse and Colossal Magnetoresistance in Doped Manganites
- Transition between two ferromagnetic states driven by orbital ordering in La_{0.88}Sr_{0.12}MnO_3
- Optical Conductivity of Manganites: Crossover from Jahn-Teller Small Polaron to Coherent Transport in the Ferromagnetic State
- Orbital Liquid in Perovskite Transition-Metal Oxides
- Short-range polaron correlations in the ferromagnetic La(1-x)Ca(x)MnO(3)
- Phase Separation Induced by Orbital Degrees of Freedom in Models for Manganites with Jahn-Teller Phonons
- Polaron Absorption in a Perovskite Manganite La0.7Ca0.3MnO3
- Charge melting and polaron collapse in
- Calculation of Densities of States and Spectral Functions by Chebyshev Recursion and Maximum Entropy
- Electrical transport in the ferromagnetic state of manganites: Small-polaron metallic conduction at low temperatures
- Observation of two time scales in the ferromagnetic manganite La(1-x)Ca(x)MnO(3), x = 0.3
- Lattice polaron formation: Effects of non-screened electron-phonon interaction
- Evidence for charge localization in the ferromagnetic phase of La_(1-x)Ca_(x)MnO_3 from High real-space-resolution x-ray diffraction
- Optical conductivity of colossal magnetorestistance compounds: Role of orbital degeneracy in the ferromagnetic phase
- Optical absorption and single-particle excitations in the 2D Holstein t-J model
- Optical spectral weights and the ferromagnetic transition temperature of CMR manganites: relevance of double-exchange to real materials
- Muon Spin Relaxation Study of (La, Ca)MnO3
- Orbital dynamics: The origin of the anomalous optical spectra in ferromagnetic manganites
- Considerations on the quantum double-exchange Hamiltonian
- Small and large polarons in nickelates, manganites, and cuprates
- Role of Orbital Degeneracy in Double Exchange Systems