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Title: Magnetic properties of a spin-orbit entangled $$J_{eff}$$ = $$\frac{1}{2}$$ honeycomb lattice

Journal Article · · Physical Review. B
 [1]; ORCiD logo [2];  [1];  [3];  [4];  [2]; ORCiD logo [1]
  1. Indian Institute of Technology (IIT), Madras (India)
  2. Ames Laboratory, and Iowa State University, Ames, IA (United States)
  3. Sungkyunkwan University, Suwon (Republic of Korea)
  4. Jozef Stefan Institute (IJS), Ljubljana (Slovenia); University of Ljubljana (Slovenia)

The interplay between spin-orbit coupling, anisotropic magnetic interaction, frustration-induced quantum fluctuations, and spin correlations can lead to novel quantum states with exotic excitations in rare-earth-based quantum magnets. Herein, we present the crystal structure, magnetization, electron spin resonance (ESR), specific heat, and nuclear magnetic resonance (NMR) experiments on the polycrystalline samples of $$\mathrm{Ba_9}$$$$\mathrm{Yb_2}$$$$\mathrm{Si_6}$$$$\mathrm{O_{24}}$$, in which $$\mathrm{Yb^{3+}}$$ ions form a perfect honeycomb lattice without detectable antisite disorder. The magnetization data reveal antiferromagnetically coupled spin-orbit entangled $$J_{eff}$$ = $$\frac{1}{2}$$ degrees of freedom of $$\mathrm{Yb^{3+}}$$ ions in the Kramers doublet state. The ESR measurements reveal that the first excited Kramers doublet is 32.3(7) meV above the ground state. The specific heat results suggest the absence of any long-range magnetic order in the measured temperature range. Furthermore, the $$\mathrm{^{29}Si}$$ NMR results do not indicate any signature of magnetic ordering down to 1.6 K, and the spin-lattice relaxation rate reveals the presence of a field-induced gap that is attributed to the Zeeman splitting of the Kramers doublet state in this quantum material. Here, our experiments detect neither spin freezing nor long-range magnetic ordering down to 1.6 K. The current results suggest the presence of short-range spin correlations in this spin-orbit entangled $$J_{eff}$$ = $$\frac{1}{2}$$ rare-earth magnet on a honeycomb lattice.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1999359
Report Number(s):
IS-J-11,144; TRN: US2405448
Journal Information:
Physical Review. B, Vol. 108, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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