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- W2088897993 abstract "We performed $^{79}mathrm{Br}$ nuclear-quadrupole-resonance (NQR) line-shape and spin-lattice relaxation time measurements in the incommensurate (I) system ensuremath{beta}-${mathrm{ThBr}}_{4}$ over the temperature range 293char21{}2.5 K. In addition, we extended the theory of the effects of Raman processes on amplitudon and phason spin-lattice relaxation in incommensurate systems by obtaining general expressions for the spectral densities and phason gap ${ensuremath{Delta}}_{ensuremath{varphi}}$ that are valid at all temperatures in the I phase. By measuring ${T}_{1}$ selectively for the different parts of the broadened NQR line in ensuremath{beta}-${mathrm{ThBr}}_{4}$, we separately obtained the phason and amplitudon contributions, ${T}_{1ensuremath{varphi}}$ and ${T}_{1A}$, respectively. A comparison between theory and the experimental data shows excellent agreement and demonstrates that spin-lattice relaxation in ensuremath{beta}-${mathrm{ThBr}}_{4}$ is dominated by Raman processes. The phason gap ${ensuremath{Delta}}_{ensuremath{varphi}}$ was determined to be 0.072ifmmodepmelsetextpmfi{}0.020 THz." @default.
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- W2088897993 date "1989-08-01" @default.
- W2088897993 modified "2023-09-26" @default.
- W2088897993 title "Br79nuclear-quadrupole-resonance line shape and Raman-induced spin-lattice relaxation in the incommensurate phase ofβ-ThBr4" @default.
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- W2088897993 doi "https://doi.org/10.1103/physrevb.40.2332" @default.
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