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- W2000647669 abstract "Abstract The second-order Raman phonon process for a multilevel spin system is shown to give a quadru-polar spin-lattice relaxation rate T 1 -1 varying as T 5 at very low temperatures. This relaxation rate for quadrupole spins is similar to the one discussed for a paramagnetic spin system having a multilevel ground state. The temperature dependence of T 1 is discussed on the basis of some simplifying assumptions about the nature of the lattice vibrations in the Debye approximation. This type of relaxation process has been observed below 20 K in tetramethylammonium hydrogen bis-trichloroacetate for the 35 Cl T 1 -1 . Below 20 K the NQR frequency in the same crystal reveals a T 4 temperature dependence due to the induced modulations of the vibrational and librational coordinates by the low-frequency acoustic phonons." @default.
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- W2000647669 date "1990-04-01" @default.
- W2000647669 modified "2023-10-16" @default.
- W2000647669 title "Calculation of NQR v's and T1-1' s being proportional to T4 and T5 , respectively" @default.
- W2000647669 doi "https://doi.org/10.1515/zna-1990-3-456" @default.
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