title: Controlling intermolecular spin interactions of La@C(82) in empty fullerene matrices.
abstract: The ESR properties and crystal structures of solid-state La@C(82) in empty fullerene matrices were investigated by changing the concentration of La@C(82) and the species of an empty fullerene matrix: C(60), C(70), C(78)(C(2v)(3)), C(82)(C(2)) and C(84)(D(2d)(4)). The rotational correlation time of La@C(82) molecules tended to be shorter when La@C(82) is dispersed in larger fullerene matrices because large C(2n) molecules provide more space for La@C(82) molecules for rotating. La@C(82) dispersed in a hcp-C(82) matrix showed the narrowest hyperfine structure (hfs) due to the ordered nature of La@C(82) molecules in the C(82) crystal. On the other hand, in a C(60) matrix, La@C(82) molecules formed clusters because of the large different solubility, which leads to the ESR spectra being broad sloping features due to strong dipole-dipole and exchange interactions.
authors.affiliation: Department of Materials, Quantum Information Processing Interdisciplinary Research Collaboration (QIP IRC), University of Oxford, Parks Rd, Oxford, UKOX1 3PH. yasuhiro.ito@materials.ox.ac.uk
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ito
authors.forename: Jamie H
authors.initials: JH
authors.lastname: Warner
authors.forename: Richard
authors.initials: R
authors.lastname: Brown
authors.forename: Mujtaba
authors.initials: M
authors.lastname: Zaka
authors.forename: Rudolf
authors.initials: R
authors.lastname: Pfeiffer
authors.forename: Takayuki
authors.initials: T
authors.lastname: Aono
authors.forename: Noriko
authors.initials: N
authors.lastname: Izumi
authors.forename: Haruya
authors.initials: H
authors.lastname: Okimoto
authors.forename: John J L
authors.initials: JJ
authors.lastname: Morton
authors.forename: Arzhang
authors.initials: A
authors.lastname: Ardavan
authors.forename: Hisanori
authors.initials: H
authors.lastname: Shinohara
authors.forename: Hans
authors.initials: H
authors.lastname: Kuzmany
authors.forename: Herwig
authors.initials: H
authors.lastname: Peterlik
authors.forename: G Andrew D
authors.initials: GA
authors.lastname: Briggs