Emergence of Spinons in Layered Trimer Iridate Ba4Ir3O10

Shen, Y.; Sears, J.; Fabbris, G.; Weichselbaum, A.; Yin, W.; Zhao, H.; Mazzone, D.  G.; Miao, H.; Upton, M.  H.; Casa, D.; Acevedo-Esteves, R.; Nelson, C.; Barbour, A.  M.; Mazzoli, C.; Cao, G.; Dean, M.  P. M.

doi:10.1103/physrevlett.129.207201

Emergence of Spinons in Layered Trimer Iridate Ba 4 Ir 3 O 10

Journal Article · Thu Nov 10 00:00:00 EST 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.207201· OSTI ID:1893745

; Sears, J.; ; Weichselbaum, A.; ; ; Mazzone, D. G.; ; Upton, M. H.; Casa, D.; Acevedo-Esteves, R.; Nelson, C.; Barbour, A. M.; Mazzoli, C.; ;

Spinons are well-known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is the subject of intense research. Here, we use resonant x-ray scattering to study the layered trimer iridate Ba₄Ir₃O₁₀, which shows no magnetic order down to 0.2 K. An emergent one-dimensional spinon continuum is observed that can be well-described by XXZ spin-1/2 chains with magnetic exchange of ~55 meV and a small Ising-like anisotropy. With 2% isovalent Sr doping, magnetic order appears below TN=130 K along with sharper excitations, indicating that the spinons become more confined in (Ba_1-xSr_x)₄Ir₃O₁₀. We propose that the frustrated intra-trimer interactions effectively reduce the system into decoupled spin chains, the subtle balance of which can be easily tipped by perturbations such as chemical doping. Our results put Ba₄Ir₃O₁₀ between the one-dimensional chain and two-dimensional quantum spin liquid scenarios, illustrating a new way to suppress magnetic order and realize fractional spinons.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; SC0012704

OSTI ID:: 1893745

Alternate ID(s):: OSTI ID: 1898973
OSTI ID: 2572621

Report Number(s):: BNL--223603-2022-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 129; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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