Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-04-09
Phys. Rev. B 77, 214403 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 6 figures, 1 table, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.214403
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.
Higashinaka Ryuji
Ishida Keiichi
Kitagawa Kentaro
Maeno Yasushi
Takigawa Mitsuaki
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