title: Magnetic properties of the layered lanthanide hydroxide series Y(x)Dy(8-x)(OH)20Cl4·6H2O: from single ion magnets to 2D and 3D interaction effects.
abstract: The magnetic properties of layered dysprosium hydroxides, both diluted in the diamagnetic yttrium analogous matrix (LYH:0.04Dy), and intercalated with 2,6-naphthalene dicarboxylate anions (LDyH-2,6-NDC), were studied and compared with the recently reported undiluted compound (LDyH = Dy8(OH)20Cl4·6H2O). The Y diluted compound reveals a single-molecule magnet (SMM) behavior of single Dy ions, with two distinct slow relaxation processes of the magnetization at low temperatures associated with the two main types of Dy sites, 8- and 9-fold coordinated. Only one relaxation process is observed in both undiluted LDyH and intercalated compounds as a consequence of dominant ferromagnetic Dy-Dy interactions, both intra- and interlayer. Semiempirical calculations using a radial effect charge (REC) model for the crystal field splitting of the Dy levels are used to explain data in terms of contributions from the different Dy sites. The dominant ferromagnetic interactions are explained in terms of orientations of easy magnetization axes obtained by REC calculations together with the sign of the superexchange expected from the Dy-O-Dy angles.
authors: C2TN, Instituto Superior Técnico/CFMCUL, Universidade de Lisboa , Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
authors: Bernardo
authors: B
authors: Monteiro
authors: Joana T
authors: JT
authors: Coutinho
authors: Cláudia C L
authors: CC
authors: Pereira
authors: Laura C J
authors: LC
authors: Pereira
authors: Joaquim
authors: J
authors: Marçalo
authors: Manuel
authors: M
authors: Almeida
authors: José J
authors: JJ
authors: Baldoví
authors: Eugenio
authors: E
authors: Coronado
authors: Alejandro
authors: A
authors: Gaita-Ariño