Raman scattering studies of spin, charge, and lattice dynamics in Ca2-xSrxRuO4 (0 =< x < 0.2)
Abstract
We use Raman scattering to study spin, charge, and lattice dynamics in various phases of Ca2-xSrxRuO4. With increasing substitution of Ca by Sr in the range 0 =< x < 0.2, 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, and hysteresis associated with the structural phase change, both of which are indicative of a first-order metal-insulator transition (TMI) and a coexistence of metallic and insulating components for T < TMI.
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