title: Bilayer mott system with cation···anion supramolecular interactions based on a nickel dithiolene anion radical: coexistence of ferro- and antiferromagnetic anion layers and large negative magnetoresistance.
abstract: A novel bilayer Mott system, (Et-4BrT)[Ni(dmit)2]2 (Et-4BrT = ethyl-4-bromothiazolium; dmit = 1,3-dithiole-2-thione-4,5-dithiolate), contains two nonequivalent Ni(dmit)2 anion layers, where both layers form Mott insulating states. Supramolecular Br(cation)···S(anion) and S(cation)···S(anion) interactions play a crucial role in constructing the bilayer structure. The ferro- and antiferromagnetic short-range-ordering layers coexist in the crystal, which achieves large negative magnetoresistance (Δρ/ρ0 ≈ -75% at 70 kOe) at 5 K under 1 GPa.
authors.affiliation: RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan. kusamoto@chem.s.u-tokyo.ac.jp
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Kusamoto
authors.forename: Hiroshi M
authors.initials: HM
authors.lastname: Yamamoto
authors.forename: Naoya
authors.initials: N
authors.lastname: Tajima
authors.forename: Yugo
authors.initials: Y
authors.lastname: Oshima
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamashita
authors.forename: Reizo
authors.initials: R
authors.lastname: Kato