title: Magnetoresistance effects evidencing the pi-d interaction in metallic organic conductors, (EDT-DSDTFVO)2*MX4 (M = Fe, Ga; X = Cl, Br).
abstract: The 2:1 salts of a new donor molecule, EDT-DSDTFVO with MX4- (M = Fe, Ga; X = Cl, Br) ions, were prepared. The crystal structures of the donor molecules had a beta-type packing motif. All the salts essentially exhibited metallic behaviors despite the small upturns in the resistances below 30-70 K. A large negative magnetoresistance (MR) effect [-14.7% (rho(perpendicular)) at 4.0 K and 5 T] was observed in the FeCl4- salt, while a positive MR effect [+4.0% (rho(perpendicular)) at 4.0 K and 5 T] was observed in the GaCl4- salt, suggesting that there is a pi-d interaction in the FeCl4- salt. The pressure application suppressed the resistivity upturns, increased the negative MR effect (-17.7% at 9.5 kbar) in the FeCl4- salt, and decreased the positive MR effect (+3.3% at 15 kbar) in the GaCl4- salt.
authors.affiliation: Department of Chemistry, Osaka Prefecture University, Osaka 599-8570, Japan. hfuji@c.s.osakafu-u.ac.jp
authors.forename: Hideki
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Toshiki
authors.initials: T
authors.lastname: Hayashi
authors.forename: Toyonari
authors.initials: T
authors.lastname: Sugimoto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakazumi
authors.forename: Satoru
authors.initials: S
authors.lastname: Noguchi
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Keiichi
authors.initials: K
authors.lastname: Yokogawa
authors.forename: Syuma
authors.initials: S
authors.lastname: Yasuzuka
authors.forename: Keizo
authors.initials: K
authors.lastname: Murata
authors.forename: Takehiko
authors.initials: T
authors.lastname: Mori