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Infrared magnetic circular dichloism (MCD), or equivalently magneto-opticalKerr effect, has been measured on the Tl2Mn2O7 pyrochlore, which is well knownfor exhibiting a large magnetoresistance around the Curie temperature T_C ~ 120K. A circularly polarized, infrared synchrotron radiation is used as the lightsource. A pronounced MCD signal is observed exactly at the plasma edge of thereflectivity near and below T_c. However, contrary to the conventional behaviorof MCD for ferromagnets, the observed MCD of Tl2Mn2O7 grows with the appliedmagnetic field, and not scaled with the internal magnetization. It is shownthat these results can be basically understood in terms of a classicalmagnetoplasma resonance. The absence of a magnetization-scaled MCD indicates aweak spin-orbit coupling of the carriers in Tl2Mn2O7. We discuss the presentresults in terms of the microscopic electronic structures of Tl2Mn2O7.Comment: 5 pages, 5 figures, submitted to J. Phys. Soc. Jp

Carrier-induced Magnetic Circular Dichloism in the Magnetoresistive Pyrochlore Tl2Mn2O7

Carrier-induced Magnetic Circular Dichloism in the Magnetoresistive Pyrochlore Tl₂Mn₂O₇