Pseudospin versus magnetic dipole moment ordering in the isosceles triangular lattice material K3Er(VO4)2

Yahne, Danielle R.; Sanjeewa, Liurukara D.; Sefat, Athena S.; Stadelman, Bradley S.; Kolis, Joseph W.; Calder, Stuart; Ross, Kate A.

doi:10.1103/physrevb.102.104423

Title: Pseudospin versus magnetic dipole moment ordering in the isosceles triangular lattice material K₃Er(VO₄)₂

Journal Article · Fri Sep 18 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.104423· OSTI ID:1735402

Yahne, Danielle R. ^[1];

^[2]; Sefat, Athena S. ^[2];

^[3]; Kolis, Joseph W. ^[3];

^[2]; Ross, Kate A. ^[4]

Colorado State Univ., Fort Collins, CO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Clemson Univ., SC (United States)
Colorado State Univ., Fort Collins, CO (United States); CIFAR, Toronto, ON (Canada)

Spin- $1 / 2$ antiferromagnetic triangular lattice models are paradigms of geometrical frustration, revealing very different ground states and quantum effects depending on the nature of anisotropies in the model. Due to strong spin orbit coupling and crystal field effects, rare-earth ions can form pseudospin- $1 / 2$ magnetic moments with anisotropic single-ion and exchange properties. Thus, rare-earth-based triangular lattices enable the exploration of this interplay between frustration and anisotropy. Here we study one such case, the rare-earth double vanadate glaserite material $K_{3} Er {({VO}_{4})}_{2}$ , which is a quasi-two-dimensional (2D) isosceles triangular antiferromagnet. Our specific heat and neutron powder diffraction data from $K_{3} {Er (VO}_{4})_{2}$ reveal a transition to long range magnetic order at $T_{N} = 155 \pm 5$ mK which accounts for all $R ln 2$ entropy. Furthermore, we observe what appears to be a coexistence of three-dimensional (3D) and quasi-2D order below $T_{N}$ . The quasi-2D order leads to an anisotropic Warren-like peak profile for $(h k 0)$ reflections, while the 3D order is best-described by layers of antiferromagnetic $b$ -aligned moments alternating with layers of zero moment. Our magnetic susceptibility data reveal that ${Er}^{3 +}$ takes on a strong $X Y$ single-ion anisotropy in $K_{3} Er {({VO}_{4})}_{2}$ , leading to vanishing moments when pseudospins are oriented along $c$ . Thus, the magnetic structure, when considered from the pseudospin point of view could comprise of alternating layers of $b$ -axis and $c$ -axis aligned antiferromagnetism.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0014271

OSTI ID:: 1735402

Journal Information:: Physical Review B, Vol. 102, Issue 10; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Pseudospin versus magnetic dipole moment ordering in the isosceles triangular lattice material K3Er(VO4)2

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Title: Pseudospin versus magnetic dipole moment ordering in the isosceles triangular lattice material K₃Er(VO₄)₂