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Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$
by G. Bastien, B. Rubrecht, E. Haeussler, P. Schlender, Z. Zangeneh, S. Avdoshenko, R. Sarkar, A. Alfonsov, S. Luther, Y. A. Onykiienko, H. C. Walker, H. Kühne, V. Grinenko, Z. Guguchia, V. Kataev, H. -H. Klauss, L. Hozoi, J. van den Brink, D. S. Inosov, B. Büchner, A. U. B. Wolter, T. Doert
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Submission summary
Authors (as registered SciPost users): | Gaël Bastien · Jeroen van den Brink |
Submission information | |
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Preprint Link: | https://arxiv.org/abs/2005.06300v3 (pdf) |
Date accepted: | Aug. 26, 2020 |
Date submitted: | July 23, 2020, 1:55 p.m. |
Submitted by: | Bastien, Gaël |
Submitted to: | SciPost Physics |
Ontological classification | |
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Academic field: | Physics |
Specialties: |
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Approaches: | Experimental, Computational |
Abstract
Recently, several putative quantum spin liquid (QSL) states were discovered in ${\tilde S} = 1/2$ rare-earth based triangular-lattice antiferromagnets (TLAF) with the delafossite structure. A way to clarify the origin of the QSL state in these systems is to identify ways to tune them from the putative QSL state towards long-range magnetic order. Here, we introduce the Ce-based TLAF KCeS$_2$ and show via low-temperature specific heat and $\mu$SR investigations that it yields magnetic order below $T_{\mathrm N} = 0.38$ K despite the same delafossite structure. We identify a well separated ${\tilde S} = 1/2$ ground state for KCeS$_2$ from inelastic neutron scattering and embedded-cluster quantum chemical calculations. Magnetization and electron spin resonance measurements on single crystals indicate a strong easy-plane $g$~factor anisotropy, in agreement with the ab initio calculations. Finally, our specific-heat studies reveal an in-plane anisotropy of the magnetic field-temperature phase diagram which may indicate anisotropic magnetic interactions in KCeS$_2$.
Published as SciPost Phys. 9, 041 (2020)
Reports on this Submission
Report #1 by Anonymous (Referee 3) on 2020-7-23 (Invited Report)
- Cite as: Anonymous, Report on arXiv:2005.06300v3, delivered 2020-07-23, doi: 10.21468/SciPost.Report.1853
Strengths
1- extensive study of new triangular lattice antiferromagnet, KCeS2, member of a group of interesting materials for spin liquid physics
2- range of experimental and theoretical tools used is very large
Weaknesses
1- authors cannot derive firm conclusions on controlling element of spin liquid vs. magnetic ground state
Report
All in all, the paper is well-written and represents a very thorough experimental and theoretical characterization of the studied material. It contributes to the present discussions of these types of materials and meets the criterion of a novel and inclusive approach from different research areas to understand new materials. I therefore recommend the paper for publication.