Publication Date:
2016-03-26
Description:
Author(s): Paul A. Goddard, John Singleton, Isabel Franke, Johannes S. Möller, Tom Lancaster, Andrew J. Steele, Craig V. Topping, Stephen J. Blundell, Francis L. Pratt, C. Baines, Jesper Bendix, Ross D. McDonald, Jamie Brambleby, Martin R. Lees, Saul H. Lapidus, Peter W. Stephens, Brendan W. Twamley, Marianne M. Conner, Kylee Funk, Jordan F. Corbey, Hope E. Tran, J. A. Schlueter, and Jamie L. Manson Arranging S = 1 2 spins into planes, chains, or other low-dimensional structures permits an experimental exploration of the effects of quantum fluctuations.In reality, such “arrangements” are often easier said than done. However, the use of molecular building blocks opens new possibilities for creating adjustable networks of spins. The authors of this paper have made and studied a series of two-dimensional square-lattice S = 1 2 antiferromagnets, whose interlayer spacing is varied considerably by the substitution of increasingly bulky axial ligands. Using a variety of techniques, including low-temperature and high-magnetic-field magnetometry, muon-spin relaxation, and electron-spin resonance, they show that the increased layer spacing reduces the interlayer coupling, as desired. However, this also permits a small non-Heisenberg-like perturbation to emerge in the intralayer interaction. This stymies the order-suppressing effect of quantum fluctuations and promotes the development of a long-range ordered state at low-temperatures. [Phys. Rev. B 93, 094430] Published Fri Mar 25, 2016
Keywords:
Magnetism
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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