Stripe antiferromagnetic ground state of the ideal triangular lattice compound KErSe2

Xing, Jie; Taddei, Keith M.; Sanjeewa, Liurukara D.; Fishman, Randy S.; Daum, Marcus; Mourigal, Martin; dela Cruz, Clarina R.; Sefat, Athena S.

doi:10.1103/physrevb.103.144413

Title: Stripe antiferromagnetic ground state of the ideal triangular lattice compound KErSe₂

Journal Article · Fri Apr 09 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.103.144413· OSTI ID:1783007

^[1];

^[2]; Sanjeewa, Liurukara D. ^[1];

^[1]; Daum, Marcus ^[3]; Mourigal, Martin ^[3];

^[2];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Georgia Institute of Technology, Atlanta, GA (United States)

Rare-earth triangular lattice materials have been proposed as a good platform for the investigation of frustrated magnetic ground states. ${KErSe}_{2}$ , with the delafossite structure, contains perfect two-dimensional ${Er}^{3 +}$ triangular layers separated by potassium ions, realizing this ideal configuration and inviting study. In this study, we investigate the magnetism of ${KErSe}_{2}$ at millikelvin temperatures by heat capacity and neutron powder diffraction. Heat capacity results reveal a magnetic transition at 0.2 K in zero applied field. This long-range order is suppressed by an applied magnetic field of 0.5 T below 0.08 K. Neutron powder diffraction suggests that the zero-field magnetic structure orders with $k = (\frac{1}{2}, 0, \frac{1}{2})$ in a stripe spin structure. Unexpectedly, Er is found to have a reduced moment of 3.06(1) $μ_{B}$ /Er in the ordered state, and diffuse magnetic scattering, which originates at higher temperatures, is found to persist in the ordered state, potentially indicating magnetic fluctuations. Neutron diffraction collected under an applied field shows a metamagnetic transition at $~ 0.5$ T to ferromagnetic order with $k = (0, 0, 0)$ and two possible structures, which are likely dependent on the applied field direction. The zero-field stripe spin structure can be explained by the anisotropic interactions or the first-, second-, and third-neighbor couplings in the antiferromagnetic triangular lattice.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; DMR-1750186

OSTI ID:: 1783007

Journal Information:: Physical Review B, Vol. 103, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Stripe antiferromagnetic ground state of the ideal triangular lattice compound KErSe₂