Quasi-two-dimensional spin correlations in the triangular lattice bilayer spin glass LuCoGaO4

Fritsch, Katharina; Ross, Kathyrn A.; Granroth, Garrett E.; Ehlers, Georg; Noad, H. M.  L.; Dabkowska, H. A.; Gaulin, Bruce D.

doi:10.1103/PhysRevB.96.094414

Quasi-two-dimensional spin correlations in the triangular lattice bilayer spin glass ${LuCoGaO}_{4}$

Journal Article · Wed Sep 13 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.094414· OSTI ID:1399429

Fritsch, Katharina ^[1]; Ross, Kathyrn A. ^[2]; ^[3]; ^[4]; Noad, H. M. L. ^[5]; Dabkowska, H. A. ^[6]; Gaulin, Bruce D. ^[7]

Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy; McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Colorado State Univ., Fort Collins, CO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Stanford Univ., CA (United States)
rockhouse Inst. for Materials Research, Hamilton, ON (Canada)
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Brockhouse Inst. for Materials Research, Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)

Here we present a single-crystal time-of-flight neutron scattering study of the static and dynamic spin correlations in LuCoGaO₄, a quasi-two-dimensional dilute triangular lattice antiferromagnetic spin-glass material. This system is based on Co²⁺ ions that are randomly distributed on triangular bilayers within the YbFe₂O₄ type, hexagonal crystal structure. Antiferromagnetic short-range two-dimensional correlations at wave vectors Q = (1/3,1/3, L) develop within the bilayers at temperatures as high as |Θ_CW| ~100 K and extend over roughly five unit cells at temperatures below T_g = 19 K. These two-dimensional static correlations are observed as diffuse rods of neutron scattering intensity along c * and display a continuous spin freezing process in their energy dependence. Aside from exhibiting these typical spin-glass characteristics, this insulating material reveals a novel gapped magnetic resonant spin excitation at ΔE ~12 meV localized around Q = (1 / 3, 1 / 3,L) . The temperature dependence of the spin gap associated with this two-dimensional excitation correlates with the evolution of the static correlations into the spin-glass state ground state. Lastly, we associate it with the effect of the staggered exchange field acting on the S_eff = 1/2 Ising-like doublet of the Co²⁺ moments.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC); Natural Sciences and Engineering Research Council of Canada (NSERC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1399429

Alternate ID(s):: OSTI ID: 1389899

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 96; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

YbMgGaO ₄ : A Triangular‐Lattice Quantum Spin Liquid Candidate Li, Yuesheng Advanced Quantum Technologies, Vol. 2, Issue 12 https://doi.org/10.1002/qute.201900089	journal	October 2019
Spin-Glass Ground State in a Triangular-Lattice Compound YbZnGaO 4 Ma, Zhen; Wang, Jinghui; Dong, Zhao-Yang Physical Review Letters, Vol. 120, Issue 8 https://doi.org/10.1103/physrevlett.120.087201	journal	February 2018
Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4 Li, Yuesheng; Bachus, Sebastian; Liu, Benqiong Physical Review Letters, Vol. 122, Issue 13 https://doi.org/10.1103/physrevlett.122.137201	journal	April 2019

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