Coexistence of magnetic order and persistent spin dynamics in a quantum kagome antiferromagnet with no intersite mixing

Zorko, A.; Pregelj, M.; Klanjšek, M.; Gomilšek, M.; Jagličić, Z.; Lord, J. S.; Verezhak, J. A. T.; Shang, T.; Sun, W.; Mi, J.-X.

doi:10.1103/physrevb.99.214441

Coexistence of magnetic order and persistent spin dynamics in a quantum kagome antiferromagnet with no intersite mixing

Zorko, A.; Pregelj, M.; Klanjšek, M.; Gomilšek, M.; Jagličić, Z.; Lord, J. S.; Verezhak, J. A. T.; Shang, T.; Sun, W.; Mi, J.-X.

Authors

A. Zorko

M. Pregelj

M. Klanjšek

M. Gomilšek

Z. Jagličić

J. S. Lord

J. A. T. Verezhak

T. Shang

W. Sun

J.-X. Mi

Abstract

One of the key questions concerning frustrated lattices that has lately emerged is the role of disorder in inducing spin-liquid-like properties. In this context, the quantum kagome antiferromagnet YCu3(OH)6Cl3, which has been recently reported as the first geometrically perfect realization of the kagome lattice with negligible magnetic/nonmagnetic intersite mixing and a possible quantum-spin-liquid ground state, is of particular interest. However, contrary to previous conjectures, here we show clear evidence of bulk magnetic ordering in this compound below TN=15 K by combining bulk magnetization and heat capacity measurements, and local-probe muon spin relaxation measurements. The magnetic ordering in this material is rather unconventional in several respects. First, a crossover regime where the ordered state coexists with the paramagnetic state extends down to TN/3 and, second, the fluctuation crossover is shifted far below TN. Moreover, persistent spin dynamics that is observed at temperatures as low as T/TN=1/300 could be a sign of emergent excitations of correlated spin loops or, alternatively, a sign of fragmentation of each magnetic moment into an ordered and a fluctuating part.

Citation

Zorko, A., Pregelj, M., Klanjšek, M., Gomilšek, M., Jagličić, Z., Lord, J., …Mi, J. (2019). Coexistence of magnetic order and persistent spin dynamics in a quantum kagome antiferromagnet with no intersite mixing. Physical review B, 99(21), Article 214441. https://doi.org/10.1103/physrevb.99.214441

Journal Article Type	Article
Online Publication Date	Jun 27, 2019
Publication Date	Jun 1, 2019
Deposit Date	Jul 2, 2019
Publicly Available Date	Jul 2, 2019
Journal	Physical Review B
Print ISSN	1098-0121
Electronic ISSN	1550-235X
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	99
Issue	21
Article Number	214441
DOI	https://doi.org/10.1103/physrevb.99.214441

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Copyright Statement
Reprinted with permission from the American Physical Society: Zorko, A., Pregelj, M., Klanjšek, M., Gomilšek, M., Jagličić, Z., Lord, J. S., Verezhak, J. A. T., Shang, T., Sun, W. & Mi, J.-X. (2019). Coexistence of magnetic order and persistent spin dynamics in a quantum kagome antiferromagnet with no intersite mixing. Physical Review B 99(21): 214441 © 2019 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.