Abstract
We use Raman scattering to study spin, charge, and lattice dynamics in various phases of With increasing substitution of Ca by Sr in the range we observe (1) evidence for an increase of the electron-phonon interaction strength, (2) an increased temperature dependence of the two-magnon energy and linewidth in the antiferromagnetic insulating phase, and (3) evidence for charge gap development significantly below the metal-insulator transition and hysteresis associated with the structural phase change, both of which are indicative of a first-order metal-insulator transition and a coexistence of metallic and insulating components for
- Received 14 May 2003
DOI:https://doi.org/10.1103/PhysRevB.68.100404
©2003 American Physical Society