title: CdEr2Se4: a new erbium spin ice system in a spinel structure.
abstract: Here we present a detailed study of the spinel CdEr2Se4 and show it to be a new instance of spin ice, the first one in an erbium material and the first one in a spinel. Definitive experimental evidence comes from the temperature dependence of the magnetic entropy, which shows an excellent agreement with the predicted behavior for a spin ice state. Crystal field calculations demonstrate that the change in the local environment from that of the titanates completely alters the rare-earth anisotropy giving rise, in the case of Er3+, to the required Ising anisotropy, when Er2Ti2O7 behaves as an XY antiferromagnet. This finding opens up the possibility of new exotic ground states within the CdR2Se4 and CdR2Se4 families.
authors.affiliation: Departament of Inorganic Chemistry, Univ. del Pas Vasco, 48080 Bilbao, Spain. jorge.lago@ehu.es
authors.forename: J
authors.initials: J
authors.lastname: Lago
authors.forename: I
authors.initials: I
authors.lastname: Zivković
authors.forename: B Z
authors.initials: BZ
authors.lastname: Malkin
authors.forename: J
authors.initials: J
authors.lastname: Rodriguez Fernandez
authors.forename: P
authors.initials: P
authors.lastname: Ghigna
authors.forename: P
authors.initials: P
authors.lastname: Dalmas de Réotier
authors.forename: A
authors.initials: A
authors.lastname: Yaouanc
authors.forename: T
authors.initials: T
authors.lastname: Rojo