we present a detailed study of the spinel CdEr(2)Se(4) 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 Er(3+), to the required Ising anisotropy, when Er(2)Ti(2)O(7) behaves as an XY antiferromagnet. This finding opens up the possibility of new exotic ground states within the CdR(2)Se(4) and CdR(2)Se(4) families.
CdEr(2)Se(4): A New Erbium Spin Ice System in a Spinel Structure
GHIGNA, PAOLO;
2010-01-01
Abstract
we present a detailed study of the spinel CdEr(2)Se(4) 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 Er(3+), to the required Ising anisotropy, when Er(2)Ti(2)O(7) behaves as an XY antiferromagnet. This finding opens up the possibility of new exotic ground states within the CdR(2)Se(4) and CdR(2)Se(4) families.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
