title: Magnetic dipolar ordering and quantum phase transition in an Fe8 molecular magnet.
abstract: We show that a crystal of mesoscopic Fe(8) single-molecule magnets is an experimental realization of the quantum Ising model in a transverse field, with dipolar interactions. Quantum annealing has enabled us to explore the quantum and classical phase transitions between the paramagnetic and ferromagnetic phases, at thermodynamical equilibrium. The phase diagram and critical exponents that we obtain agree with expectations for the mean-field universality class.
authors.affiliation: Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Burzurí
authors.forename: F
authors.initials: F
authors.lastname: Luis
authors.forename: B
authors.initials: B
authors.lastname: Barbara
authors.forename: R
authors.initials: R
authors.lastname: Ballou
authors.forename: E
authors.initials: E
authors.lastname: Ressouche
authors.forename: O
authors.initials: O
authors.lastname: Montero
authors.forename: J
authors.initials: J
authors.lastname: Campo
authors.forename: S
authors.initials: S
authors.lastname: Maegawa
mesh_terms: D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D033363:Neutron Diffraction; D011789:Quantum Theory
chemical_list: D007501:Iron