Non-monotonic zero point entropy in diluted spin ice

Details Non-monotonic zero point entropy in diluted spin ice Non-monotonic zero point entropy in diluted spin ice

2007-07-24

arxiv.org/abs/0707.3629v1

Phys. Rev. Lett. 99, 137203 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.137203

Water ice and spin ice are important model systems in which theory can directly account for zero point entropy associated with quenched configurational disorder. Spin ice differs from water ice in the important respect that its fundamental constituents, the spins of the magnetic ions, can be removed through replacement with non-magnetic ions while keeping the lattice structure intact. In order to investigate the interplay of frustrated interactions and quenched disorder, we have performed systematic heat capacity measurements on spin ice materials which have been thus diluted up to 90%. Investigations of both Ho and Dy spin ices reveal that the zero point entropy depends non-monotonically on dilution and approaches the value of Rln2 in the limit of high dilution. The data are in good agreement with a generalization of Pauling's theory for the entropy of ice.

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