Shortrange order in the quantum XXZ honeycomb lattice material ${\mathrm{BaCo}}_{2}{\left({\mathrm{PO}}_{4}\right)}_{2}$
Abstract
In this paper, we present observations of highly frustrated quasitwodimensional (2D) magnetic correlations in the honeycomb lattice layers of the S_{eff} =1/2 compound γBaCo_{2}(PO_{4})_{2} (γBCPO). 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 quasi2D 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 quasi2D 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 γBCPO is compared with linear spin wave theory, and two separate parameter regions of the XXZ J_{1}J_{2}J_{3} model with ferromagnetic nearestneighbor exchange J_{1} are favored, both near regions of high classical degeneracy. High energy coherent excitations (~10 meV) persist up to at least 40 K, suggesting strong inplane correlations persist above TN. Finally, these data show that γBCPO is a rare highly frustrated, quasi2D S_{eff} =1/2 honeycomb lattice material which resists long range magnetic order and spin freezing.
 Authors:

 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
 Publication Date:
 Research Org.:
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES)
 OSTI Identifier:
 1435190
 Alternate Identifier(s):
 OSTI ID: 1432902
 Grant/Contract Number:
 AC0500OR22725
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 97; Journal Issue: 13; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Nair, Harikrishnan S., Brown, J, Coldren, E., Hester, G., Gelfand, M., Podlesnyak, Andrey A., Huang, Q., and Ross, K. A. Shortrange order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.134409.
Nair, Harikrishnan S., Brown, J, Coldren, E., Hester, G., Gelfand, M., Podlesnyak, Andrey A., Huang, Q., & Ross, K. A. Shortrange order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2. United States. https://doi.org/10.1103/PhysRevB.97.134409
Nair, Harikrishnan S., Brown, J, Coldren, E., Hester, G., Gelfand, M., Podlesnyak, Andrey A., Huang, Q., and Ross, K. A. Thu .
"Shortrange order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2". United States. https://doi.org/10.1103/PhysRevB.97.134409. https://www.osti.gov/servlets/purl/1435190.
@article{osti_1435190,
title = {Shortrange order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2},
author = {Nair, Harikrishnan S. and Brown, J and Coldren, E. and Hester, G. and Gelfand, M. and Podlesnyak, Andrey A. and Huang, Q. and Ross, K. A.},
abstractNote = {In this paper, we present observations of highly frustrated quasitwodimensional (2D) magnetic correlations in the honeycomb lattice layers of the Seff =1/2 compound γBaCo2(PO4)2 (γBCPO). Specific heat shows a broad peak comprised of two weak kink features at TN1~6 K and TN2~3.5 K, the relative weights of which can be modified by sample annealing. Neutron powder diffraction measurements reveal short range quasi2D order that is established below TN1 and TN2, at which two separate, incompatible, short range magnetic orders onset: commensurate antiferromagnetic correlations with correlation length ξc=60±2 Å (TN1) and in quasi2D helical domains with ξh=350±11 Å (TN2). The ac magnetic susceptibility response lacks frequency dependence, ruling out spin freezing. Inelastic neutron scattering data on γBCPO is compared with linear spin wave theory, and two separate parameter regions of the XXZ J1J2J3 model with ferromagnetic nearestneighbor 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 inplane correlations persist above TN. Finally, these data show that γBCPO is a rare highly frustrated, quasi2D Seff =1/2 honeycomb lattice material which resists long range magnetic order and spin freezing.},
doi = {10.1103/PhysRevB.97.134409},
journal = {Physical Review B},
number = 13,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}
Web of Science
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