Abstract
The temperature dependence of resistivity, magnetization, and electron-spin resonance of the single crystal were measured in temperature range of . Magnetization hysteresis in an applied magnetic field up to at , 77, and , irreversible temperature behavior of magnetization, and resistivity were found. The obtained data were explained in terms of a degenerate tight binding model using random phase approximation. The contribution of holes in and bands of manganese ions to the conductivity, optical absorbtion spectra, and charge instability in were studied. Charge susceptibility maxima resulted from the competition of the on-site Coulomb interaction between the holes in different orbitals and small hybridization of subbands were calculated at , 250, and .
6 More- Received 16 April 2004
DOI:https://doi.org/10.1103/PhysRevB.71.125204
©2005 American Physical Society