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Pressure-temperature phase boundaries in KC24: Evidence for a kinetically-hindered low-temperature staging transition
Umeå University, Faculty of Science and Technology, Physics.
1986 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 34, no 5, 3532-3535 p.Article in journal (Refereed) Published
Abstract [en]

The pressure-temperature phase diagram of KC24 was mapped out using in-plane resistivity anomalies to identify phase boundaries. Surprisingly, the 300-K staging transitions at 3.4 and 6.4 kbar are found to connect to the 1-bar ordering-stacking transitions at Tu=123 K and Tl=96 K, respectively, whereas the loci of P, T anomalies cannot be equilibrium phase boundaries since the low-P, low-T transitions do not involve stage transformations. We suggest that this unusual behavior is due to kinetic hindering of the low-T staging transitions, predicted by simple equilibrium models and observed in the analogous Li compound. A possible origin of the slow staging kinetics at low T in KC24 is the pinning of discommensurations at Daumas-Herold boundaries.

Place, publisher, year, edition, pages
1986. Vol. 34, no 5, 3532-3535 p.
Keyword [en]
Graphite intercalation compound, GIC, graphite, HOPG, potassium, KC24, stage 2, staging transition, high pressure, low temperature, resistivity, contactless measurements, order-disorder transformation, frustration, kinetic effect
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26360DOI: 10.1103/PhysRevB.34.3532OAI: diva2:242056
Available from: 2009-10-06 Created: 2009-10-06 Last updated: 2010-02-03

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ReferencesLink to record
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