CdEr2Se4: A New Erbium Spin Ice System in a Spinel Structure

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.


Published in:
Physical Review Letters, 104, 247203, -
Year:
2010
Publisher:
American Physical Society
ISSN:
0031-9007
Keywords:
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 Record created 2010-09-21, last modified 2018-01-28

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