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In situ electrical conductivity and Raman study of C60 tetragonal polymerat high pressures up to 30 GPa
Lawrence Livermore National Laboratory.
Lawrence Livermore National Laboratory.
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2010 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 274, no 11/12, p. 3068-3071Article in journal (Refereed) Published
Abstract [en]

Theory predicts that tetragonal polymeric C60 will undergo a phase transition into a metallic phase at pressures around 20 GPa. Raman and structural experiments at high pressures confirmed formation of a new phase above 20 GPa although the question about its electrical properties was still open. We report on the first simultaneous in situ study of vibrational and electrical properties of two-dimensional (2D) tetragonal C60 polymer at pressures up to 30 GPa in a diamond anvil cell (DAC) specially designed for this purpose. Our results reveal an anomaly in Raman spectra and a drop in electrical resistance of the sample at 20-25 GPa. We tentatively associate this anomalous behaviour with a phase transition into the conductive phase although its metallic character is yet to be proven.At high pressures the Raman spectra exhibit a high degree of disorder. Upon pressure release the order was partially restored and, more importantly, a significant amount of the initial 2D polymeric phase was recovered.

Place, publisher, year, edition, pages
2010. Vol. 274, no 11/12, p. 3068-3071
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Fysik
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URN: urn:nbn:se:ltu:diva-9411DOI: 10.1002/pssb.201000298ISI: 000285798400102Scopus ID: 2-s2.0-78649701115Local ID: 806c5030-ca0a-11df-a707-000ea68e967bOAI: oai:DiVA.org:ltu-9411DiVA, id: diva2:982349
Note
Validerad; 2010; 20100927 (matmas)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Mases, MattiasYou, ShujieSoldatov, Alexander

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