Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$

Bastien, Gaël; Rubrecht, Bastian; Häußler, Ellen; Schlender, Philipp; Zangeneh, Ziba; Avdoshenko, Stanislav; Sarkar, Rajib; Alfonsov, Alexey; Luther, Sven; Onykiienko, Yevhen A.; Walker, Helen C.; Kühne, Hannes; Grinenko, Vadim; Guguchia, Zurab; Kataev, Vladislav; Klauss, Hans-Henning; Hozoi, Liviu; van den Brink, Jeroen; Inosov, Dmytro S.; Büchner, Bernd; Wolter-Giraud, Anja; Doert, Thomas

doi:10.21468/SciPostPhys.9.3.041

SciPost Physics

Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$

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

SciPost Phys. 9, 041 (2020) · published 17 September 2020

doi: 10.21468/SciPostPhys.9.3.041
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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$_2$.

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.9.3.041
TI  - Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$
PY  - 2020/09/17
UR  - https://scipost.org/SciPostPhys.9.3.041
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 9
IS  - 3
SP  - 041
A1  - Bastien, Gaël
AU  - Rubrecht, Bastian
AU  - Häußler, Ellen
AU  - Schlender, Philipp
AU  - Zangeneh, Ziba
AU  - Avdoshenko, Stanislav
AU  - Sarkar, Rajib
AU  - Alfonsov, Alexey
AU  - Luther, Sven
AU  - Onykiienko, Yevhen A.
AU  - Walker, Helen C.
AU  - Kühne, Hannes
AU  - Grinenko, Vadim
AU  - Guguchia, Zurab
AU  - Kataev, Vladislav
AU  - Klauss, Hans-Henning
AU  - Hozoi, Liviu
AU  - van den Brink, Jeroen
AU  - Inosov, Dmytro S.
AU  - Büchner, Bernd
AU  - Wolter-Giraud, Anja
AU  - Doert, Thomas
AB  - 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$_2$.
ER  -

@Article{10.21468/SciPostPhys.9.3.041,
	title={{Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$}},
	author={G. Bastien and B. Rubrecht and E. Haeussler and P. Schlender and Z. Zangeneh and S. Avdoshenko and R. Sarkar and A. Alfonsov and S. Luther and Y. A. Onykiienko and H. C. Walker and H. Kühne and V. Grinenko and Z. Guguchia and V. Kataev and H. -H. Klauss and L. Hozoi and J. van den Brink and D. S. Inosov and B. Büchner and A. U. B. Wolter and T. Doert},
	journal={SciPost Phys.},
	volume={9},
	pages={041},
	year={2020},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.9.3.041},
	url={https://scipost.org/10.21468/SciPostPhys.9.3.041},
}

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Authors / Affiliations: mappings to Contributors and Organizations

See all Organizations.

¹ Gaël Bastien,
¹ ² Bastian Rubrecht,
² Ellen Häußler,
² Philipp Schlender,
¹ Ziba Zangeneh,
¹ Stanislav Avdoshenko,
² Rajib Sarkar,
¹ Alexey Alfonsov,
² ³ Sven Luther,
² Yevhen A. Onykiienko,
⁴ Helen C. Walker,
³ Hannes Kühne,
¹ ² Vadim Grinenko,
⁵ Zurab Guguchia,
¹ Vladislav Kataev,
² Hans-Henning Klauss,
¹ Liviu Hozoi,
¹ ² Jeroen van den Brink,
² Dmytro S. Inosov,
¹ ² Bernd Büchner,
¹ Anja Wolter-Giraud,
² Thomas Doert

Funders for the research work leading to this publication

Deutsche Forschungsgemeinschaft / German Research FoundationDeutsche Forschungsgemeinschaft [DFG]
Horizon 2020 (through Organization: European Commission [EC])