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High pressure studies of alkali metal doped fullerides A4C60
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2011 (English)In: Diamond and Related Materials, Volume 20, issue 4: Proceedings of New Diamond and Nanocarbon 2010 (NDNC2010), Elsevier , 2011, 600-603 p.Conference paper (Refereed)
Abstract [en]

The electrical resistance R of K4C60 and Li4C60 has been measured between 100 and 300 K under pressures up to 1 and 2 GPa, respectively. For both materials, the temperature coefficient of R is negative at all pressures and temperatures in this range. The transport properties of Li4C60 at low pressure are compatible with a recent observation of high ionic conductivity, but surprisingly, this conductivity term increases strongly with increasing pressure, contradicting an intuitive model. For K4C60 we see no sign of a recently suggested structural phase transformation at low temperature, nor can we find any convincing evidence for a lattice disproportionation as recently observed for Rb4C60.

Place, publisher, year, edition, pages
Elsevier , 2011. 600-603 p.
Diamond and Related Materials, ISSN 0925-9635 ; Volume 20, issue 4
Keyword [en]
Alkali metal fullerides, C60, intercalation, K4C60, Li4C60, ionic conduction, resistivity, conductivity, electronic conduction, high pressure, Raman spectroscopy, X-ray diffraction
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-43122DOI: 10.1016/j.diamond.2011.01.009ISI: 000291140200029OAI: diva2:411531
New Diamond and Nano Carbon 2010 (NDNC 2010), Suzhou, May 2010
Swedish Research Council, 621-2010-3732
Available from: 2011-04-19 Created: 2011-04-18 Last updated: 2015-09-28Bibliographically approved

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Sundqvist, BertilWågberg, ThomasYao, Mingguang
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