Ferroelectricity in (K@C$_{60}$)$_n$

Details Ferroelectricity in (K@C$_{60}$)$_n$ Ferroelectricity in (K@C$_{60}$)$_n$

2002-12-20

arxiv.org/abs/cond-mat/0212525v1

Fundamental Physics of Ferroelectrics, pp. 259-265 (AIP Press, NY, 2000)

Physics

Condensed Matter

Materials Science

6 pages, 4 figures

Scientific paper

A theoretical analysis of the ground state of long-chain (K@C$_{60}$)$_n$ is presented. Within mean field theory, a ferroelectric ground state is found to be stable because of the pseudo-Jahn-Teller mixing of the b$_{1u}$ and the b$_{2g}$ band with a zone-center optical phonon involving the displacement of the endohedral K^+ ions. A phase diagram for this model is derived in the narrow bandwidth regime.

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