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- W2029207894 abstract "The pure ${mathrm{As}}^{75}$ nuclear quadrupole resonances (NQR) of crystalline and amorphous ${mathrm{As}}_{2}$${mathrm{S}}_{3}$ have been investigated and compared. The temperature dependence of the resonance frequencies, the asymmetry parameters $ensuremath{eta}$, and the orientation of the principal axes of the electric field grandient with respect to the crystal axes have been obtained for crystalline ${mathrm{As}}_{2}$${mathrm{S}}_{3}$ (orpiment). We obtain ${ensuremath{eta}}_{mathrm{I}}=0.343$ and ${ensuremath{eta}}_{mathrm{II}}=0.374$, where I and II refer to the two inequivalent As sites in the unit cell. A Townes-Dailey calculation for the NQR frequency of the asymmetric As${mathrm{S}}_{3}$ pyramidal unit has also been performed. The NQR spectrum of crystalline ${mathrm{As}}_{2}$${mathrm{S}}_{3}$ consists of two narrow lines approximately 50 kHz wide occuring at 70.38 and 72.86 MHz at 4.2 ifmmode^circelsetextdegreefi{}K, while the spectrum of amorphous ${mathrm{As}}_{2}$${mathrm{S}}_{3}$ consists of a broad line with 3.5-MHz halfwidth. This is explained by a distribution of apex pyramidal bonding angles in the glass with a halfwidth of ensuremath{sim}1ifmmode^circelsetextdegreefi{}. The nuclear transverse relaxation times ${T}_{2}$ have been measured by the spin-echo technique in both the glass and the crystal. In the crystal, ${T}_{2}=0.6$ msec for site II, and ${T}_{2}ensuremath{cong}1$ msec for site I; while we obtain ${T}_{2}=0.6$ msec for the glass. The close agreement between the glass and crystal transverse relaxation indicates the retention of some crystalline correlation in the glass. The spin-lattice relaxation time ${T}_{1}$ has been measured as a function of temperature in the crystal and can be fit by the relation ${T}_{1}=30.64{sinh}^{2}(frac{14.5}{kT})$, indicating that the nuclei relax by Raman scattering of optical phonons. The spin-lattice relaxation time measured in the glass is much faster, obeying the relation ${T}_{1}=125{T}^{ensuremath{-}2}$. The faster relaxation in the glass indicates the presence of extra low-frequency modes which are absent in the crystal." @default.
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- W2029207894 date "1974-05-15" @default.
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- W2029207894 title "Nuclear quadrupole resonance in amorphous and crystalline<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>S</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow…" @default.
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- W2029207894 doi "https://doi.org/10.1103/physrevb.9.4258" @default.
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