Spinons and damped phonons in the spin-12 quantum liquid Ba4Ir3O10 observed by Raman scattering

Sokolik, Aaron; Hakani, Sami; Roy, Susmita; Pellatz, Nicholas; Zhao, Hengdi; Cao, Gang; Kimchi, Itamar; Reznik, Dmitry

doi:10.1103/physrevb.106.075108

Spinons and damped phonons in the spin- 12 quantum liquid Ba4 Ir3 O10 observed by Raman scattering

Journal Article · Wed Aug 03 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.075108· OSTI ID:1903374

^[1]; ^[2]; ^[3]; Pellatz, Nicholas ^[3]; Zhao, Hengdi ^[3]; ^[3]; Kimchi, Itamar ^[2]; ^[3]

Univ. of Colorado, Boulder, CO (United States); University of Colorado-Boulder
Georgia Inst. of Technology, Atlanta, GA (United States)
Univ. of Colorado, Boulder, CO (United States)

In spin-1/2 Mott insulators, nonmagnetic quantum liquid phases are often argued to arise when the system shows no magnetic ordering, but identifying positive signatures of these phases or related spinon quasiparticles can be elusive. Here, we use Raman scattering to provide three signatures for spinons in a possible spin-orbit quantum liquid material Ba₄Ir₃O₁₀: (1) a broad hump, which we show can arise from Luttinger liquid spinons in Raman with parallel photon polarizations normal to one-dimensional chains; (2) strong phonon damping from phonon-spin coupling via the spin-orbit interaction; and (3) the absence of (1) and (2) in the magnetically ordered phase that is produced when 2% of Ba is substituted by Sr [(Ba_0.98Sr_0.02)₄Ir₃O₁₀]. Furthermore, the phonon damping via itinerant spinons seen in this quantum liquid insulator suggests a mechanism for enhancing thermoelectricity in strongly correlated conductors, through a neutral quantum liquid that need not affect electronic transport.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0006939

OSTI ID:: 1903374

Alternate ID(s):: OSTI ID: 1879598

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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