Disorder-induced excitation continuum in a spin- 12 cobaltate on a triangular lattice

Gao, Bin; Chen, Tong; Huang, Chien-Lung; Qiu, Yiming; Xu, Guangyong; Liebman, Jesse; Chen, Lebing; Stone, Matthew B.; Feng, Erxi; Cao, Huibo; Wang, Xiaoping; Xu, Xianghan; Cheong, Sang-Wook; Winter, Stephen M.; Dai, Pengcheng

doi:10.1103/physrevb.108.024431

Title: Disorder-induced excitation continuum in a spin- 1 2 cobaltate on a triangular lattice

Journal Article · Mon Jul 31 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.024431· OSTI ID:1997811

^[1]; Chen, Tong ^[1]; Huang, Chien-Lung ^[2]; Qiu, Yiming ^[3]; Xu, Guangyong ^[3]; Liebman, Jesse ^[1]; Chen, Lebing ^[1];

^[4];

^[4]; Xu, Xianghan ^[5];

^[5]; Winter, Stephen M. ^[6]; Dai, Pengcheng ^[1]

Rice Univ., Houston, TX (United States)
National Cheng Kung Univ., Tainan City (Taiwan)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Rutgers Univ., Piscataway, NJ (United States)
Wake Forest Univ., Winston-Salem, NC (United States)

A spin-1/2 triangular-lattice antiferromagnet is a prototypical frustrated quantum magnet, which exhibits remarkable quantum many-body effects that arise from the synergy between geometric spin frustration and quantum fluctuations. It can host quantum frustrated magnetic topological phenomena such as quantum spin liquid (QSL) states, highlighted by the presence of fractionalized quasiparticles within a continuum of magnetic excitations. Here, in this work, we use neutron scattering to study CoZnMo₃ O₈, which has a triangular lattice of J_eff = 1/2 Co²⁺ ions with octahedral coordination. We found a wave-vector-dependent excitation continuum at low energy that disappears with increasing temperature. Although these excitations are reminiscent of a spin excitation continuum in a QSL state, their presence in CoZnMo₃ O₈ originates from magnetic intersite disorder-induced dynamic spin states with peculiar excitations. Our results, therefore, provide direct experimental evidence for the presence of a disorder-induced spin excitation continuum.

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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). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725; SC0012311; FG02-07ER46382

OSTI ID:: 1997811

Journal Information:: Physical Review. B, Vol. 108, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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