Absence of the 90 K structural transition in CuV2S4 crystals grown by chemical vapour transport using TeC14

• Published in: Journal of physics. Condensed matter Vol. 17; no. 30; pp. 4813 - 4823
• Main Authors: Crandles, D A, Reedyk, M, Wardlaw, G, Razavi, F S, Hagino, T, Nagata, S, Shimono, I, Kremer, R K
• Format: Journal Article
• Language: English
• Published: 03.08.2005
• ISSN: 0953-8984
• DOI: 10.1088/0953-8984/17/30/007

Various physical properties (magnetization, specific heat, optical reflectance, electrical resistivity) of CuV2S4 crystals grown by chemical vapour transport using TeC14 as the transporting agent have been measured. The data show slight differences compared to samples grown using different techniques. These differences include the absence of a sharp drop in magnetization and the absence of a peak in the heat capacity near 90 K. These differences suggest that the cubictetragonal phase transition near 90 K does not occur in these particular crystals. The reflectance of the same crystals has been studied from (70-20 000 cm 1) for temperatures between 40 and 300 K and the data are consistent with those for a disordered metal. A high frequency absorption, perhaps an interband transition, has been observed in addition to absorption due to strongly scattered free carriers.