Nonlinear magnons and exchange Hamiltonians of the delafossite proximate quantum spin liquid candidates KYbSe2 and NaYbSe2

Scheie, A. O.; Kamiya, Y.; Zhang, Hao; Lee, Sangyun; Woods, A. J.; Ajeesh, M. O.; Gonzalez, M. G.; Bernu, B.; Villanova, J. W.; Xing, J.; Huang, Q.; Zhang, Qingming; Ma, Jie; Choi, Eun Sang; Pajerowski, D. M.; Zhou, Haidong; Sefat, A. S.; Okamoto, Satoshi; Berlijn, Tom; Messio, L.; Movshovich, R.; Batista, C. D.; Tennant, D. A.

doi:10.1103/physrevb.109.014425

Nonlinear magnons and exchange Hamiltonians of the delafossite proximate quantum spin liquid candidates KYbSe2 and NaYbSe2

Journal Article · Thu Jan 25 00:00:00 EST 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.014425· OSTI ID:2406761

^[1]; Kamiya, Y. ^[2]; Zhang, Hao ^[3]; ^[4]; Woods, A. J. ^[4]; ^[4]; ^[5]; ^[5]; ^[6]; ^[7]; Huang, Q. ^[3]; Zhang, Qingming ^[8]; Ma, Jie ^[2]; Choi, Eun Sang ^[9]; ^[7]; ^[3]; Sefat, A. S. ^[7]; ^[7]; ^[7]; ^[10] more »

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Shanghai Jiao Tong Univ. (China)
Univ. of Tennessee, Knoxville, TN (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sorbonne Univ., Paris (France)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Lanzhou Univ. (China)
Florida State Univ., Tallahassee, FL (United States)
Sorbonne Univ., Paris (France); Institute Universitaire de France, Paris (France)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Quantum spin liquids (QSLs) are theoretical states of matter with long-range entanglement and exotic quasiparticles. However, they generally elude quantitative theory, rendering their underlying phases mysterious and hampering efforts to identify experimental QSL states. Here we study triangular-lattice resonating-valence-bond QSL candidate materials KYbSe₂ and NaYbSe₂. We measure the magnon modes in their 1/3 plateau phase, where quantitative theory is tractable, using inelastic neutron scattering and fit them using nonlinear spin wave theory. We also fit the KYbSe₂ heat capacity using high-temperature series expansion. Both KYbSe₂ fits yield the same magnetic Hamiltonian to within uncertainty, confirming previous estimates and showing the Heisenberg ratio J₂/J₁ to be an accurate model for these materials. Most importantly, comparing KYbSe₂ and NaYbSe₂ shows that the smaller A-site Na⁺ ion has a larger J₂/J₁ ratio. However, hydrostatic pressure applied to KYbSe₂ increases the ordering temperature (a result consistent with density functional theory calculations), indicating that pressure decreases J₂/J₁. In conclusion, these results show how the periodic table and hydrostatic pressure can tune the AYbSe₂ materials in a controlled way.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2406761

Alternate ID(s):: OSTI ID: 2473991

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 1 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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