Phys. Rev. Lett. 99, 086402 (2007) [4 pages]Novel Orientational Ordering and Reentrant Metallicity in KxC60 Monolayers for 3≤x≤5Received 26 September 2006; published 22 August 2007 STM studies on KxC60 monolayers reveal new behavior over a wide range of the phase diagram. As x increases from 3 to 5 KxC60 monolayers undergo metal-insulator-metal reentrant phase transitions and exhibit a variety of novel orientational orderings, including a complex 7-molecule, pinwheel-like structure. The proposed driving mechanism for the orientational ordering is the lowering of electron kinetic energy by maximizing the overlap of neighboring molecular orbitals. In insulating (metallic) KxC60 this gives rise to orbital versions of the superexchange (double-exchange) interaction. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.086402
DOI:
10.1103/PhysRevLett.99.086402
PACS:
71.20.Tx, 68.37.Ef, 73.61.Wp, 81.16.Rf
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