High-temperature spin relaxation process in Dy${}_2$Ti${}_2$O${}_7$ probed by ${}^{47}$Ti-NQR

Abstract

We have performed nuclear quadrupole resonance (NQR) experiments on ${}^{47}$Ti nuclei in Dy${}_2$Ti${}_2$O${}_7$ in the temperature range 70 -- 300 K in order to investigate the dynamics of $4f$ electrons with strong Ising anisotropy. A significant change of the NQR frequency with temperature was attributed to the variation of the quadrupole moment of Dy $4f$ electrons. A quantitative account was given by the mean field analysis of the quadrupole-quadrupole (Q-Q) interaction in the presence of the crystalline-electric-field splitting. The magnitude and the temperature dependence of the nuclear spin-lattice relaxation rate was analyzed, including both the spin-spin and the Q-Q interactions. The results indicate that these two types of interaction contribute almost equally to the fluctuation of Dy magnetic moments.

arXiv comment8 pages, 6 figures, 1 table, accepted for publication in Phys. Rev. B

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• Thermodynamic Properties of the Dipolar Spin Ice Model
• Specific Heat of Kagome Ice in the Pyrochlore Oxide Dy2Ti2O7
• Magnetocaloric Study of Spin Relaxation in `Frozen' Dipolar Spin Ice Dy2Ti2O7
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• Temperature dependent Raman and x-ray studies of spin-ice pyrochlore $D{y}_{2}T{i}_2{O}_7$ and non-magnetic pyrochlore $L{u}_{2}T{i}_2{O}_7$
• Spin Ice: Magnetic Excitations without Monopole Signatures using Muon Spin Rotation
• New physics in frustrated magnets: Spin ices, monopoles, etc
• Generalised Longitudinal Susceptibility for Magnetic Monopoles in Spin Ice
• Spin freezing in the disordered pyrochlore magnet NaCaCo${}_2$F${}_7$: NMR studies and Monte-Carlo simulations
• Suppression of Pauling's Residual Entropy in Dilute Spin Ice (Dy${}_{1-x}$Y${}_x$)${}_2$Ti${}_2$O${}_7$
• Possible Quantum Diffusion of Polaronic Muons in Dy${}_2$Ti${}_2$O${}_7$ Spin Ice
• Heat transport of the spin-ice materials Ho${}_2$Ti${}_2$O${}_7$ and Dy${}_2$Ti${}_2$O${}_7$
• Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy${}_2$Ti${}_2$O${}_7$