Refined spin-wave model and multimagnon bound states in Li2CuO2

Eli Zoghlin, Matthew B. Stone, Stephen D. Wilson

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2 Scopus citations

Abstract

Here we report a study of the spin dynamics in the ferromagnetic chain compound Li2CuO2. Inelastic neutron scattering measurements allow for the spin Hamiltonian to be determined using a J1-J2 XXZ-Heisenberg spin chain model with weak interchain interactions. The primary exchange parameters determined from our data are qualitatively consistent with those of Lorenz et al. [Europhys. Lett. 88, 37002 (2009)0295-507510.1209/0295-5075/88/37002], and our data allow for the resolution of additional interchain exchange interactions. We also observe the formation of two- and, potentially, three-magnon bound states. The two-magnon bound state exists only in the magnetically ordered phase of this material, consistent with stabilization by the weak, Ising-like exchange anisotropy of the nearest-neighbor intrachain interaction. In contrast, the potential three-magnon state persists in a finite temperature regime above TN, indicating an unconventional character. Our results establish Li2CuO2 as an experimental platform for the study of exchange anisotropy-stabilized bound states in a ferromagnetic chain.

Original languageEnglish
Article number064408
JournalPhysical Review B
Volume108
Issue number6
DOIs
StatePublished - Aug 1 2023

Funding

We thank A. Kolesnikov for assistance with the inelastic neutron scattering experiment and acknowledge insightful discussions with L. Balents, S. Nishimoto, and C. Agrapidis. This work was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Grant No. DE-SC0017752. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This work made use of the MRL Shared Experimental Facilities which are supported by the MRSEC Program of the NSF under Award No. DMR 1720256, a member of the NSF-funded Materials Research Facilities Network. It also used facilities supported via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under Award No. DMR-1906325. This work was additionally supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under Contract No. DE-SC0014664. E.Z. recognizes financial support from JHU through the Sweeney Family Postdoctoral Fellowship.

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