Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet

Arh, T.; Gomilšek, M.; Prelovšek, P.; Pregelj, M.; Klanjšek, M.; Ozarowski, A.; Clark, S. J.; Lancaster, T.; Sun, W.; Mi, J.-X.; Zorko, A.

Abstract

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.

Citation

Arh, T., Gomilšek, M., Prelovšek, P., Pregelj, M., Klanjšek, M., Ozarowski, A., …Zorko, A. (2020). Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet. Physical Review Letters, 125(2), Article 027203. https://doi.org/10.1103/physrevlett.125.027203

• Journal Article Type: Article
• Acceptance Date: Jun 12, 2020
• Online Publication Date: Jul 8, 2020
• Publication Date: Jul 10, 2020
• Deposit Date: Jul 9, 2020
• Publicly Available Date: Jul 9, 2020
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 125
• Issue: 2
• Article Number: 027203
• DOI: https://doi.org/10.1103/physrevlett.125.027203
• Public URL: https://durham-repository.worktribe.com/output/1267114