Abstract
Transmittance of the colossal magnetoresistive compound Nd 0.5Sr 0.5MnO 3 showing metal–insulator phase transition has been studied by means of the submm- and mm-wavelength band spectroscopy. An unusually high transparency of the material provided direct evidence for the significant suppression of the coherent Drude-weight in the ferromagnetic metallic state. Melting of the A-type antiferromagnetic states has been found to be responsible for a considerable increase in the microwave transmission, which was observed at the transition from the insulating to the metallic phase induced by magnetic field or temperature. This investigation confirmed a dominant role of the ( x 2− y 2)-orbital degree of freedom in the low-energy optical properties of Nd 0.5Sr 0.5MnO 3 and other doped manganites with planar ( x 2− y 2)-orbital order, as predicted theoretically. The results are discussed in terms of the orbital-liquid concept.
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