Charge Dynamics in the Colossal Magneto-Resistance Pyrochlore Tl2Mn2O7

Details Charge Dynamics in the Colossal Magneto-Resistance Pyrochlore Tl2Mn2O7 Charge Dynamics in the Colossal Magneto-Resistance Pyrochlore Tl2Mn2O7

2001-05-09

arxiv.org/abs/cond-mat/0105185v2

Phys. Rev. B 64 (Rapid Com), 180409 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to Phys. Rev. B Rapid Commun

Scientific paper

10.1103/PhysRevB.64.180409

Optical conductivity data s(w) of the colossal magneto-resistance (CMR) pyrochlore Tl2Mn2O7 are presented as functions of temperature (T) and externalmagnetic field (B). Upon cooling and upon applying B near the Curietemperature, where the CMR manifests itself, s(w) shows a clear transition from an insulatorlike to a metallic electronic structure as evidenced by theemergence of a pronounced Drude-like component below 0.2 eV. Analyses on thes(w) spectra show that both T- and B-induced evolutions of the electronicstructure are very similar to each other, and that they are universally related to the development of macroscopic magnetization (M). In particular, the effective carrier density obtained from s(w) scales with M^2 over wide ranges of T and B. The contributions to the CMR from the carrier effective mass and scattering time are also evaluated from the data.

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