Magnetic order in the quasi-one-dimensional Ising system RbCoCl3

Hänni, N. P.; Sheptyakov, D.; Mena, M.; Hirtenlechner, E.; Keller, L.; Stuhr, U.; Regnault, L.-P.; Medarde, M.; Cervellino, A.; Rüegg, Ch.; Normand, B.; Krämer, K. W. (2021). Magnetic order in the quasi-one-dimensional Ising system RbCoCl3. Physical Review B, 103(9) American Physical Society APS 10.1103/PhysRevB.103.094424

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In RbCoCl3, the magnetic Co2+ ions form weakly coupled Ising chains arranged on a triangular lattice. We have investigated the structure and magnetism in RbCoCl3 by high-resolution x-ray diffraction and neutron scattering measurements on powder and single-crystal samples between 1.5 and 300 K. Upon cooling, the Co2+ spins develop one-dimensional antiferromagnetic correlations along the chain axis (c axis) below 90 K. Below the first Néel temperature, TN1 = 28K, a partial three-dimensional magnetic order sets in, with propagation vector k1 = (1/3, 1/3, 1), the moments aligned along the c axis, and every third chain uncorrelated from its neighbors. Only below a second magnetic phase transition at TN2 = 13K does the system achieve a fully ordered state, with two additional propagation vectors: k2 = (0, 0, 1) establishes a “honeycomb” c-axis order, in which one third of the chains are subject to a strong effective mean field due to their neighbors whereas two thirds experience no net field, while k3 = (1/2, 0, 1) governs a small, staggered, in-plane ordered moment. We conclude that RbCoCl3 is an excellent material to study the physics of Ising chains in a wide variety of temperature-controlled environments, and our results build an important foundation for the accurate interpretation of the spin dynamics measured in each case.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Hänni, Nora Phillys and Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

2469-9950

Publisher:

American Physical Society APS

Funders:

[UNSPECIFIED] SNF

Language:

English

Submitter:

Karl Krämer

Date Deposited:

23 Jun 2021 19:41

Last Modified:

30 Jun 2021 10:47

Publisher DOI:

10.1103/PhysRevB.103.094424

ArXiv ID:

2102.01099

BORIS DOI:

10.48350/156927

URI:

https://boris.unibe.ch/id/eprint/156927

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