CUED Publications database

Graphite intercalation compounds under pressure

Csanyi, G and Pickard, CJ and Simons, BD and Needs, RJ Graphite intercalation compounds under pressure. (Unpublished)

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Motivated by recent experimental work, we use first-principles density functional theory methods to conduct an extensive search for low enthalpy structures of C$_6$Ca under pressure. As well as a range of buckled structures, which are energetically competitive over an intermediate range of pressures, we show that the high pressure system ($\gtrsim 18$ GPa) is unstable towards the formation of a novel class of layered structures, with the most stable compound involving carbon sheets containing five- and eight-membered rings. As well as discussing the energetics of the different classes of low enthalpy structures, we comment on the electronic structure of the high pressure compound and its implications for superconductivity.

Item Type: Article
Uncontrolled Keywords: cond-mat.supr-con cond-mat.supr-con cond-mat.mtrl-sci
Divisions: Div C > Applied Mechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:09
Last Modified: 18 Feb 2021 18:16