Universität zu Köln

Scharffe, S., Breunig, O., Cho, V., Laschitzky, P., Valldor, M., Welter, J. F. and Lorenz, T. (2015). Suppression of Pauling's residual entropy in the dilute spin ice (Dy1-xYx)(2)Ti2O7. Phys. Rev. B, 92 (18). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

Around 0.5 K, the entropy of the spin ice Dy2Ti2O7 has a plateaulike feature close to Pauling's residual entropy derived originally for water ice, but an unambiguous quantification towards lower temperature is prevented by ultraslow thermal equilibration. Based on the specific-heat data of (Dy1-xYx)(2)Ti2O7 we analyze the influence of nonmagnetic dilution on the low-temperature entropy. With increasing x, the ultraslow thermal equilibration rapidly vanishes, the low-temperature entropy systematically decreases, and its temperature dependence strongly increases. These data suggest that a nondegenerate ground state is realized in (Dy1-xYx)(2)Ti2O7 for intermediate dilution. This contradicts the expected zero-temperature residual entropy obtained from a generalization of Pauling's theory for dilute spin ice, but is supported by Monte Carlo simulations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Scharffe, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breunig, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cho, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Laschitzky, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Valldor, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Welter, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-387202
DOI:	10.1103/PhysRevB.92.180405
Journal or Publication Title:	Phys. Rev. B
Volume:	92
Number:	18
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1550-235X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETIC MONOPOLES; DY2TI2O7; CRYSTALS; DYNAMICS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38720