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- W2079361980 abstract "Recently reported experimental results on a-Si:H have led to suggestions that ${mathrm{H}}_{2}$ in the microvoids of a-Si:H undergoes a phase transition to an orientational ordered state at temperatures ranging from 3 to 20 K. The interpretation is based upon the onset of a Pake doublet in NMR experiments that is suggestive of an order parameter and also by peaks in the heat capacity of ${mathrm{H}}_{2}$ in a-Si:H. We show that orientational ordering of microvoid ${mathrm{H}}_{2}$ is extremely unlikely at any temperature and certainly not above the critical temperature of bulk single-crystal ${mathrm{H}}_{2}$. Instead we shall show that the observed Pake doublet is a manifestation of the slow molecular relaxation regime and that the heat capacity can be explained entirely by a distribution of electric field gradients. Neither phenomenon requires a phase transition driven by the electric quadrupole-quadrupole molecular interactions. However, the sharp onset of the Pake doublet reflects the size and surface conditions of the microvoids." @default.
- W2079361980 created "2016-06-24" @default.
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- W2079361980 date "1987-08-01" @default.
- W2079361980 modified "2023-09-24" @default.
- W2079361980 title "Molecular relaxation versus orientational ordering of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>in<i>a</i>-Si:H" @default.
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- W2079361980 doi "https://doi.org/10.1103/physrevb.36.2107" @default.
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