title: Entanglement in supramolecular spin systems of two weakly coupled antiferromagnetic rings (purple-Cr7Ni).
abstract: We characterize supramolecular magnetic structures, consisting of two weakly coupled antiferromagnetic rings, by low-temperature specific heat, susceptibility, magnetization and electron paramagnetic resonance measurements. Intra- and inter-ring interactions are modeled through a microscopic spin-Hamiltonian approach that reproduces all the experimental data quantitatively and legitimates the use of an effective two-qubit picture. Spin entanglement between the rings is experimentally demonstrated through magnetic susceptibility below 50 mK and theoretically quantified by the concurrence.
authors.affiliation: National Research Center on nanoStructures and bioSystems at Surfaces (S3), CNR-INFM, 41100 Modena, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Candini
authors.forename: G
authors.initials: G
authors.lastname: Lorusso
authors.forename: F
authors.initials: F
authors.lastname: Troiani
authors.forename: A
authors.initials: A
authors.lastname: Ghirri
authors.forename: S
authors.initials: S
authors.lastname: Carretta
authors.forename: P
authors.initials: P
authors.lastname: Santini
authors.forename: G
authors.initials: G
authors.lastname: Amoretti
authors.forename: C
authors.initials: C
authors.lastname: Muryn
authors.forename: F
authors.initials: F
authors.lastname: Tuna
authors.forename: G
authors.initials: G
authors.lastname: Timco
authors.forename: E J L
authors.initials: EJ
authors.lastname: McInnes
authors.forename: R E P
authors.initials: RE
authors.lastname: Winpenny
authors.forename: W
authors.initials: W
authors.lastname: Wernsdorfer
authors.forename: M
authors.initials: M
authors.lastname: Affronte