Negative thermal expansion of fullerite C60 at liquid helium temperatures

Negative thermal expansion of fullerite C60 at liquid helium temperatures

The thermal expansion of fullerite C60 has been measured in the temperature range 2-9 K. A compact fullerite sample with a diameter of about 6 mm and a height of 2.4 mm was used. It was found that, at temperatures below 3.4 K, the linear thermal expansion coefficient becomes negative. At temperature...

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Veröffentlicht in:Fizika nizkih temperatur (Kiev) 1997-11, Vol.23 (11), p.1256-1260
Hauptverfasser: Aleksandrovskii, A N, Esel'son, V B, Manzhelii, V G, Soldatov, A V, Sundqvist, B, Udovichenko, B G
Format: Artikel
Sprache:eng
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Zusammenfassung:The thermal expansion of fullerite C60 has been measured in the temperature range 2-9 K. A compact fullerite sample with a diameter of about 6 mm and a height of 2.4 mm was used. It was found that, at temperatures below 3.4 K, the linear thermal expansion coefficient becomes negative. At temperatures above 5 K, our results are in good agreement with the available data in the literature. A qualitative explanation of the results is proposed. (Author)
ISSN:0132-6414