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- W365366064 abstract "We measured the nuclear magnetic spin–lattice ( T 1 -1 ) and spin–spin ( T 2 -1 ) relaxation rates of 119 Sn nuclei of the Ising pyrochlore magnet Dy 2 Sn 2 O 7 and the Heisenberg pyrochlore magnet Gd 2 Sn 2 O 7 at high temperatures (120–294 K for Dy 2 Sn 2 O 7 and 20–284 K for Gd 2 Sn 2 O 7 ) to investigate their high-temperature 4 f -electron spin dynamics. We found the following two results, which reveal remarkable differences between the spin dynamics of Dy 2 Sn 2 O 7 and Gd 2 Sn 2 O 7 . First, the ratio T 2 -1 / T 1 -1 for powder samples is almost unity in Dy 2 Sn 2 O 7 , whereas it is about 6 in Gd 2 Sn 2 O 7 . Second, these relaxation rates increase markedly on cooling in Dy 2 Sn 2 O 7 , reflecting thermal activation with a gap of ∼600 K, whereas they are almost constant with temperature in Gd 2 Sn 2 O 7 . The former result indicates that spin fluctuations of Dy 2 Sn 2 O 7 are completely restricted to the <111 > direction, whereas Gd spins fluctuate three-dimensionally and the component of the fluctuations parallel to an externally applied field contributes to the nuclear relaxation rates in Gd 2 Sn 2 O 7 . The latter result indicates that the spin fluctuations of Dy 2 Sn 2 O 7 are caused by an indirect spin-flip process mediated through an excited state of the crystalline electric field multiplets, whereas those of Gd 2 Sn 2 O 7 are dominated by the direct mutual spin-flip process by interactions between 4 f -electron spins." @default.
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- W365366064 date "2012-05-15" @default.
- W365366064 modified "2023-10-17" @default.
- W365366064 title "Different High-Temperature Spin Dynamics of Ising Pyrochlore Dy<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub> and Heisenberg Pyrochlore Gd<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub>" @default.
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- W365366064 doi "https://doi.org/10.1143/jpsj.81.054701" @default.
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