Short-range order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2

Nair, Harikrishnan S.; Brown, J; Coldren, E.; Hester, G.; Gelfand, M.; Podlesnyak, Andrey A.; Huang, Q.; Ross, K. A.

doi:10.1103/PhysRevB.97.134409

Title: Short-range order in the quantum XXZ honeycomb lattice material ${BaCo}_{2} {({PO}_{4})}_{2}$

Journal Article · 12 April 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.134409 · OSTI ID:1435190

Nair, Harikrishnan S. ^[1]; Brown, J ^[1]; Coldren, E. ^[1]; Hester, G. ^[1]; Gelfand, M. ^[1];

^[2]; Huang, Q. ^[3]; Ross, K. A. ^[4]

Colorado State Univ., Fort Collins, CO (United States). Department of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Colorado State Univ., Fort Collins, CO (United States). Department of Physics; Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario (Canada). Quantum Materials Program

In this paper, we present observations of highly frustrated quasi-two-dimensional (2D) magnetic correlations in the honeycomb lattice layers of the S_eff =1/2 compound γ-BaCo₂(PO₄)₂ (γ-BCPO). Specific heat shows a broad peak comprised of two weak kink features at T_N1~6 K and T_N2~3.5 K, the relative weights of which can be modified by sample annealing. Neutron powder diffraction measurements reveal short range quasi-2D order that is established below T_N1 and T_N2, at which two separate, incompatible, short range magnetic orders onset: commensurate antiferromagnetic correlations with correlation length ξ_c=60±2 Å (T_N1) and in quasi-2D helical domains with ξ_h=350±11 Å (T_N2). The ac magnetic susceptibility response lacks frequency dependence, ruling out spin freezing. Inelastic neutron scattering data on γ-BCPO is compared with linear spin wave theory, and two separate parameter regions of the XXZ J₁-J₂-J₃ model with ferromagnetic nearest-neighbor exchange J₁ are favored, both near regions of high classical degeneracy. High energy coherent excitations (~10 meV) persist up to at least 40 K, suggesting strong in-plane correlations persist above TN. Finally, these data show that γ-BCPO is a rare highly frustrated, quasi-2D S_eff =1/2 honeycomb lattice material which resists long range magnetic order and spin freezing.

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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)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1435190

Alternate ID(s):: OSTI ID: 1432902

Journal Information:: Physical Review B, Vol. 97, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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