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Origin of magnetic ordering in a structurally perfect quantum Kagome Antiferromagnet

Arh, T. and Gomilšek, M. and Prelovšek, P. and Pregelj, M. and Klanjšek, M. and Ozarowski, A. and Clark, S. J. and Lancaster, T. and Sun, W. and Mi, J.-X. and Zorko, A. (2020) 'Origin of magnetic ordering in a structurally perfect quantum Kagome Antiferromagnet.', Physical review letters., 125 (2). 125.027203.


The ground state of the simple Heisenberg nearest-neighbor quantum kagome antiferromagnetic model is a magnetically disordered spin liquid, yet various perturbations may lead to fundamentally different states. Here we disclose the origin of magnetic ordering in the structurally perfect kagome material YCu3(OH)6Cl3, which is free of the widespread impurity problem. Ab initio calculations and modeling of its magnetic susceptibility reveal that, similar to the archetypal case of herbertsmithite, the nearest-neighbor exchange is by far the dominant isotropic interaction. Dzyaloshinskii-Moriya (DM) anisotropy deduced from electron spin resonance, susceptibility, and specific-heat data is, however, significantly larger than in herbertsmithite. By enhancing spin correlations within kagome planes, this anisotropy is essential for magnetic ordering. Our study isolates the effect of DM anisotropy from other perturbations and unambiguously confirms the predicted phase diagram.

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Publisher statement:Reprinted with permission from the American Physical Society: Arh, T., Gomilšek, M., Prelovšek, P., Pregelj, M., Klanjšek, M., Ozarowski, A., Clark, S. J., Lancaster, T., Sun, W., Mi, J.-X. & Zorko, A. (2020). Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet. Physical Review Letters 125(2): 027203. © 2020 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:12 June 2020
Date deposited:09 July 2020
Date of first online publication:08 July 2020
Date first made open access:09 July 2020

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