title: A metallic (EDT-DSDTFVSDS)2.FeBr4 salt: antiferromagnetic ordering of d spins of FeBr4- ions and anomalous magnetoresistance due to preferential pi-d interaction.
abstract: The 2:1 salt of a new donor molecule, EDT-DSDTFVSDS with FeBr4- ion, (EDT-DSDTFVSDS)2.FeBr4 showed an essentially metallic behavior despite a small upturn in the electrical resistance below ca. 30 K (electrical conductivities at 290 and 4.2 K are 200 and 170 S cm-1, respectively). The Fe(III) d spins of the FeBr4- ions in this salt were subject to antiferromagnetic ordering at 3.3 K by virtue of a strong pi-d interaction (Jpid) which is comparable to that in a molecular metallic conductor, lambda-(BETS)2.FeCl4, and of a very weak d-d interaction (Jdd). This strong pi-d interaction was evidenced by a large and negative magnetoresistance effect (ca. 20% at 5 T) as well as by the appearance of a large dip in the resistance at the magnetic field (ca. 2.0 T) parallel to the easy axis for the spin-flop transition of the Fe(III) d spins.
authors.affiliation: Graduate School of Science, Osaka Prefecture University, Osaka 599-8570, Japan.
authors.forename: Toshiki
authors.initials: T
authors.lastname: Hayashi
authors.forename: Xunwen
authors.initials: X
authors.lastname: Xiao
authors.forename: Hideki
authors.initials: H
authors.lastname: Fujiwara
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: Tsutomu
authors.initials: T
authors.lastname: Fujimoto
authors.forename: Syuma
authors.initials: S
authors.lastname: Yasuzuka
authors.forename: Harukazu
authors.initials: H
authors.lastname: Yoshino
authors.forename: Keizo
authors.initials: K
authors.lastname: Murata
authors.forename: Takehiko
authors.initials: T
authors.lastname: Mori
authors.forename: Hiroko
authors.initials: H
authors.lastname: Aruga-Katori