title: Influence of magnetic field upon the conductance of a unicomponent crystal of a tetrathiafulvalene-based nitronyl nitroxide.
abstract: A spin-polarized donor, BTBN, which is a dibromotetrathiafulvalene derivative containing a nitronyl nitroxide group in a cross-conjugated manner, was prepared. Upon hole injection from an electrode, the neutral microcrystals of BTBN exhibited nonlinear I-V characteristics that were interpreted in terms of the space-charge-limited conduction (SCLC) mechanism. Moreover, the resistance of BTBN decreased upon application of a magnetic field below 30 K and exhibited a giant negative magnetoresistance of (R(H) - R(0))/R(0) = -76% at 2 K under 5 T. These results show that the transport of carriers in the neutral unicomponent radical crystal can be controlled by the external magnetic field. These findings are important as a basis for developing molecule-based spin electronic devices.
authors.affiliation: Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Hideji
authors.initials: H
authors.lastname: Komatsu
authors.forename: Michio M
authors.initials: MM
authors.lastname: Matsushita
authors.forename: Shigefumi
authors.initials: S
authors.lastname: Yamamura
authors.forename: Yoko
authors.initials: Y
authors.lastname: Sugawara
authors.forename: Kentaro
authors.initials: K
authors.lastname: Suzuki
authors.forename: Tadashi
authors.initials: T
authors.lastname: Sugawara
mesh_terms: D003460:Crystallization; D004553:Electric Conductivity; D006571:Heterocyclic Compounds / Q000737:chemistry*; D008280:Magnetics; D008958:Models, Molecular; D015394:Molecular Structure; D009589:Nitrogen Oxides / Q000737:chemistry*; D013696:Temperature
chemical_list: D006571:Heterocyclic Compounds; D009589:Nitrogen Oxides; C063887:tetrathiafulvalene