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- W2085457695 abstract "The spin-lattice relaxation time (${mathit{T}}_{1}$) in arsenic ${(}^{75}$As nucleus; I=3/2) has been measured, using pulsed nuclear-quadrupole-resonance methods, as a function of temperature from 4 to 596 K. The results show that ${mathit{T}}_{1}$ follows the Korringa relation (${mathit{T}}_{1}$T=const) for temperatures below the Debye temperature (${mathit{FTHETA}}_{mathit{D}}$=282 K). Above ${mathit{FTHETA}}_{mathit{D}}$ the data break away from this relation, and the measured ${mathit{T}}_{1}$ is shorter than that predicted by a nucleus-carrier relaxation model. Previous calculations of nucleus-carrier spin-flip transition probabilities involving a spherical Fermi surface (FS) have been extended to the nonspherical FS of arsenic. Modified expressions have been derived using a spheroidal approximation to the FS pockets. The carrier wave functions are approximated by free-atom wave functions. These calculations can account for the magnitude of measured nucleus-carrier interactions at low temperatures, and predict the usual Korringa law for the temperature dependence. The experimental results above ${mathit{FTHETA}}_{mathit{D}}$ can be accounted for using both nucleus-carrier processes (ensuremath{propto}T) and nucleus-phonon processes (ensuremath{propto}${mathit{T}}^{2}$)." @default.
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- W2085457695 date "1992-04-01" @default.
- W2085457695 modified "2023-09-27" @default.
- W2085457695 title "Korringa and phonon nuclear-spin–lattice relaxation in metallic arsenic" @default.
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- W2085457695 doi "https://doi.org/10.1103/physrevb.45.7882" @default.
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