title: Effect of included guest molecules on the normal state conductivity and superconductivity of beta''-(ET)(4)[(H(3)O)Ga(C(2)O(4))(3)].G (G = pyridine, nitrobenzene).
abstract: Normal state conductivity and superconductivity together with bulk magnetic susceptibility and magnetization measurements have been measured for two molecular charge-transfer salts: beta' '-(ET)4[(H3O)Ga(C2O4)3]G (ET = bis(ethylenedithio)tetrathiafulvalene, G = pyridine for compound I and nitrobenzene for compound II). With the exception of the included guest molecules (G) the crystal structures are almost identical. Both show minima in their electrical transport at 130 K for I and at 160 K for II, but at lower temperatures their behaviors differ markedly. The resistance of I reaches a maximum at 50 K with a further small peak at 2 K and possible superconductivity only below 2 K, whereas that of II increases continuously down to 7.5 K, where an abrupt transition to a superconducting state occurs.
authors.affiliation: Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, UK.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Akutsu
authors.forename: Akane
authors.initials: A
authors.lastname: Akutsu-Sato
authors.forename: Scott S
authors.initials: SS
authors.lastname: Turner
authors.forename: Delphine
authors.initials: D
authors.lastname: Le Pevelen
authors.forename: Peter
authors.initials: P
authors.lastname: Day
authors.forename: Vladimir
authors.initials: V
authors.lastname: Laukhin
authors.forename: Anne-Katrin
authors.initials: AK
authors.lastname: Klehe
authors.forename: John
authors.initials: J
authors.lastname: Singleton
authors.forename: Derek A
authors.initials: DA
authors.lastname: Tocher
authors.forename: Michael R
authors.initials: MR
authors.lastname: Probert
authors.forename: Judith A K
authors.initials: JA
authors.lastname: Howard