2007/08/22 by Yayu Wang, Ryan Yamachika, R. Yamachika +10 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Chemical Physics Studies #Antiferromagnetism #Chemistry #Condensed matter physics #Crystallography #Fullerene Chemistry and Applications #Graphene research and applications #Materials science #Monolayer #Nanotechnology #Phase (matter) #Phase diagram #Physics #Quantum mechanics #Superexchange #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.99.086402
published as Phys. Rev. Lett. 99, 086402 (2007) · 16 pages, 4 figures
openalex publication_date 2007/08/22 · arxiv created 2007/12/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
STM studies on K(x)C(60) monolayers reveal new behavior over a wide range of the phase diagram. As x increases from 3 to 5 K(x)C(60) 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) K(x)C(60) this gives rise to orbital versions of the superexchange (double-exchange) interaction.