Abstract
Temperature dependences of the dc electrical resistance and far-infrared reflectance spectra are reported in a new type of halogenated niobium tetraselenide (NbSe 4) xI. In the dc resistance measurement, successive resistance anomalies were observed between 270 K and 90 K. Far-infrared reflectance spectra clearly show that several new phonon modes appear below 260 K. These features evidently show the existence of at least one structural phase transition.
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