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Local magnetism and spin dynamics of the frustrated honeycomb rhodate Li2RhO3

Khuntia, P.; Manni, S.; Foronda, F.R.; Lancaster, T.; Blundell, S.J.; Gegenwart, P.; Baenitz, M.

Local magnetism and spin dynamics of the frustrated honeycomb rhodate Li2RhO3 Thumbnail


Authors

P. Khuntia

S. Manni

F.R. Foronda

S.J. Blundell

P. Gegenwart

M. Baenitz



Abstract

We reportmagnetization, heat capacity, 7Li nuclear magnetic resonance (NMR), and muon-spin rotation (μSR) measurements on the honeycomb 4d5 spin liquid candidate Li2RhO3. The magnetization in small magnetic fields provides evidence of the partial spin-freezing of a small fraction of Rh4+ moments at 6 K, whereas the Curie-Weiss behavior above 100 K suggests a pseudo-spin-1/2 paramagnet with a moment of about 2.2μB. The magnetic specific heat (Cm) exhibits no field dependence and demonstrates the absence of long-range magnetic order down to 0.35 K. Cm/T passes through a broad maximum at about 10 K and Cm ∝ T 2 at low temperatures. Measurements of the spin-lattice relaxation rate (1/T1) reveal a gapless slowing-down of spin fluctuations upon cooling with 1/T1 ∼ T 2.2. The results from NMR and μSR are consistent with a scenario in which a minority of Rh4+ moments are in a short-range correlated frozen state and coexist with a majority of moments in a liquid-like state that continue to fluctuate at low temperatures.

Citation

Khuntia, P., Manni, S., Foronda, F., Lancaster, T., Blundell, S., Gegenwart, P., & Baenitz, M. (2017). Local magnetism and spin dynamics of the frustrated honeycomb rhodate Li2RhO3. Physical Review B, 96(9), Article 094432. https://doi.org/10.1103/physrevb.96.094432

Journal Article Type Article
Acceptance Date Sep 6, 2017
Online Publication Date Sep 25, 2017
Publication Date Sep 25, 2017
Deposit Date Sep 26, 2017
Publicly Available Date Oct 6, 2017
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 96
Issue 9
Article Number 094432
DOI https://doi.org/10.1103/physrevb.96.094432
Related Public URLs https://arxiv.org/abs/1512.04904

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Copyright Statement
Reprinted with permission from the American Physical Society: Khuntia, P., Manni, S., Foronda, F. R., Lancaster, T., Blundell, S. J., Gegenwart, P. & Baenitz, M. (2017). Local magnetism and spin dynamics of the frustrated honeycomb rhodate Li2RhO3. Physical Review B 96(9): 094432, 2017 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.





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