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- W1636686789 abstract "Measurements have been made of the velocity and attenuation of ultrasonic plate mode waves in Ti${mathrm{S}}_{2}$, Ti${mathrm{Se}}_{2}$, and Ti${mathrm{S}}_{0.5}$${mathrm{Se}}_{1.5}$ between 4 and 300 K. Ti${mathrm{Se}}_{2}$ exhibits large anomalies associated with the occurrence of a charge-density-wave transition near ${T}_{c}=200$ K. Measurements of the expansion coefficient and of the $ensuremath{alpha}$-axis uniaxial stress dependence of ${T}_{c}$ have also been made, and these measurements, together with other data in the literature, are discussed in terms of the Ehrenfest relationships. A large discrepancy is observed between results obtained from thermal expansion and those obtained from elastic properties. The temperature dependence of the velocity in Ti${mathrm{Se}}_{2}$ below ${T}_{c}$ is accounted for by an anharmonic contribution and an electron-phonon contribution, which reflects the opening of an energy gap on the Fermi surface by the charge-density wave. Above ${T}_{c}$, the velocity changes are found to be affected by fluctuations over a wide temperature range and it is suggested that these fluctuations are associated with the phonon mode softening near the $L$ point of the Brillouin zone as ${T}_{c}$ is approached. Reduced-dimensionality effects are suggested." @default.
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- W1636686789 date "1983-11-15" @default.
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- W1636686789 title "Thermal expansion, ultrasonic velocity, and attenuation measurements in Ti<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>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, Ti<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Se</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow…" @default.
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- W1636686789 doi "https://doi.org/10.1103/physrevb.28.5454" @default.
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