Static and dynamic spin properties in the quantum triangular lattice antiferromagnet Ag2CoO2

Yoshida, H.; Dissanayake, Sachith E.; Christianson, Andrew; Dela Cruz, Clarina R.; Cheng, Yongqiang; Okamoto, Satoshi; Yamaura, K.; Isobe, M.; Matsuda, Masaaki

doi:10.1103/physrevb.102.024445

Title: Static and dynamic spin properties in the quantum triangular lattice antiferromagnet Ag₂CoO₂

Journal Article · Wed Jul 29 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.024445· OSTI ID:1649642

Yoshida, H. ^[1];

^[2];

^[2]; Yamaura, K. ^[3]; Isobe, M. ^[3];

^[2]

Hokkaido Univ., Sapporo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Inst. for Materials Science (NIMS), Tsukuba (Japan)

In Ag₂CoO₂, Co forms triangular lattice layers, which are separated by the metallic (Ag₂) block. The magnetic susceptibility and heat capacity measurements show that this material exhibits an antiferromagnetic transition at T_N=17.5 K and the Weiss temperature (T_Θ) and the effective moment are -274 K and 1.62μ_B, respectively, indicating that the Co ion carries spin (S) 1/2 and has a strongly frustrated state with T_Θ/T_N=15.7. A density functional theory calculation confirmed that the valence state of the Co ions is 2+ and the low-spin state with S=1/2 is realized at reduced on-site Coulomb interaction on Co. We performed elastic and inelastic neutron scattering experiments in a powder sample of Ag₂CoO₂. Although no noticeable magnetic Bragg peaks were observed below T_N, distinct magnetic excitations were observed in the inelastic neutron scattering experiments. The excitations are consistent with those expected for the S=1/2 Heisenberg triangular lattice antiferromagnet. These results suggest that the ordered moment is reduced due to the quantum effect, which explains the absence of the magnetic Bragg peaks. Our results thus suggest that Ag₂CoO₂ is a good candidate to realize a quantum Heisenberg triangular lattice antiferromagnet.

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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

OSTI ID:: 1649642

Journal Information:: Physical Review B, Vol. 102, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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