Colossal magnetooptical conductivity in doped manganites

Abstract

We show that the current carrier density collapse in doped manganites, which results from bipolaron formation in the paramagnetic phase, leads to a colossal change of the optical conductivity in an external magnetic field at temperatures close to the ferromagnetic transition. As with the colossal magnetoresistance (CMR) itself, the corresponding magnetooptical effect is explained by the dissociation of localized bipolarons into mobile polarons owing to the exchange interaction with the localized Mn spins in the ferromagnetic phase. The effect is positive at low frequencies and negative in the high-frequency region. The present results agree with available experimental observations.

4 pages, REVTeX 3.0, two eps-figures included in the text

References in corpus (4)

• Carrier Density Collapse and Colossal Magnetoresistance in Doped Manganites
• Polaron Absorption in a Perovskite Manganite La0.7Ca0.3MnO3
• Infrared Studies of a La_{0.67}Ca_{0.33}MnO_3 Single Crystal: Optical Magnetoconductivity in a Half-Metallic Ferromagnet
• The Density of States of hole-doped Manganites: A Scanning Tunneling Microscopy/Spectroscopy study

Cited by in corpus (8)

• Electrodynamics of Correlated Electron Materials
• Extrinsic Magnetotransport Phenomena in Ferromagnetic Oxides
• Polaronic excitations in CMR manganite films
• Optical Absorption of an Interacting Many-Polaron Gas
• The Essential Interactions in Oxides and Spectral Weight Transfer in Doped Manganites
• Spin/Orbital Pattern-Dependent Polaron Absorption in Nd(1-x)Sr(x)MnO3
• Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Polaronic Signatures in Mid-Infrared Spectra: Prediction for LaMnO3 and CaMnO3