Skip to main content

Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4

Publication ,  Journal Article
Pratt, FL; Lang, F; Steinhardt, W; Haravifard, S; Blundell, SJ
Published in: Physical Review B
August 1, 2022

Electron spin dynamics was studied down to 80 mK in the triangular-lattice quantum spin-liquid candidate YbZnGaO4 using muon spin relaxation, finding no evidence for freezing or ordering of the Yb spins. The muon spin relaxation rate can be represented by the sum of two contributions, one dependent on longitudinal magnetic field and the other independent of field. The field-dependent term follows the form expected for two-dimensional diffusion of mobile spin excitations. The spin-diffusion rate obtained for these excitations in the high temperature paramagnetic regime is comparable with the exchange coupling frequency J/h, reducing significantly in the low temperature quantum regime. This slowdown is assigned to the effect of quantum entanglement. The exchange coupling J is estimated to be 2.0(2) K from the crossover between the two regimes. The field-independent term is only weakly dependent on temperature, and at 15 K its absolute value is consistent with dipolar coupling of the muon to the three Yb moments closest to the muon site, where the spin dynamics of these moments is determined by exchange fluctuations. The temperature-dependent properties in the quantum regime are compared against the three possible U(1) spin-liquid models that have been obtained for the strongly spin-orbit coupled triangular lattice by Y.-D. Li, Y.-M. Lu, and G. Chen [Phys. Rev. B 96, 054445 (2017)2469-995010.1103/PhysRevB.96.054445]. The comparison with theory takes published specific heat and thermal conductivity data into account, along with the spin-diffusion rate obtained from the muons. It is found that the nodal spin-liquid model U1A11 containing both linear and quadratic nodes provides better agreement with experiment than either the U1A00 spinon Fermi surface (FS) model or the U1A01 model that contains only linear nodes.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Physical Review B

DOI

EISSN

2469-9969

ISSN

2469-9950

Publication Date

August 1, 2022

Volume

106

Issue

6

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Pratt, F. L., Lang, F., Steinhardt, W., Haravifard, S., & Blundell, S. J. (2022). Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4. Physical Review B, 106(6). https://doi.org/10.1103/PhysRevB.106.L060401
Pratt, F. L., F. Lang, W. Steinhardt, S. Haravifard, and S. J. Blundell. “Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4.” Physical Review B 106, no. 6 (August 1, 2022). https://doi.org/10.1103/PhysRevB.106.L060401.
Pratt FL, Lang F, Steinhardt W, Haravifard S, Blundell SJ. Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4. Physical Review B. 2022 Aug 1;106(6).
Pratt, F. L., et al. “Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4.” Physical Review B, vol. 106, no. 6, Aug. 2022. Scopus, doi:10.1103/PhysRevB.106.L060401.
Pratt FL, Lang F, Steinhardt W, Haravifard S, Blundell SJ. Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4. Physical Review B. 2022 Aug 1;106(6).

Published In

Physical Review B

DOI

EISSN

2469-9969

ISSN

2469-9950

Publication Date

August 1, 2022

Volume

106

Issue

6

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences