Anomalous resistivity of iodine-free 2H-NbSe2

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Abstract

Resistance ratios of crystals of 2H-NbSe2 grown with and without iodine were measured over the temperature range 6K–40K. Iodine-free crystals had higher ratios than any NbSe2 previously reported and exhibited an abrupt anomaly at the onset of the charge density wave phase. All crystals displayed a cubic temperature dependence of their resistivities below 18K.

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