title: Multiferroic behavior associated with an order-disorder hydrogen bonding transition in metal-organic frameworks (MOFs) with the perovskite ABX3 architecture.
abstract: Multiferroic behavior in perovskite-related metal-organic frameworks of general formula [(CH(3))(2)NH(2)]M(HCOO)(3), where M = Mn, Fe, Co, and Ni, is reported. All four compounds exhibit paraelectric-antiferroelectric phase transition behavior in the temperature range 160-185 K (Mn: 185 K, Fe: 160 K; Co: 165 K; Ni: 180 K); this is associated with an order-disorder transition involving the hydrogen bonded dimethylammonium cations. On further cooling, the compounds become canted weak ferromagnets below 40 K. This research opens up a new class of multiferroics in which the electrical ordering is achieved by means of hydrogen bonding.
authors.affiliation: Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA.
authors.forename: Prashant
authors.initials: P
authors.lastname: Jain
authors.forename: Vasanth
authors.initials: V
authors.lastname: Ramachandran
authors.forename: Ronald J
authors.initials: RJ
authors.lastname: Clark
authors.forename: Hai Dong
authors.initials: HD
authors.lastname: Zhou
authors.forename: Brian H
authors.initials: BH
authors.lastname: Toby
authors.forename: Naresh S
authors.initials: NS
authors.lastname: Dalal
authors.forename: Harold W
authors.initials: HW
authors.lastname: Kroto
authors.forename: Anthony K
authors.initials: AK
authors.lastname: Cheetham