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- W2016540315 endingPage "9835" @default.
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- W2016540315 abstract "In previous studies on a number of underdoped and overdoped high-temperature superconductors, including ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}y}$ and ${mathrm{Tl}}_{2}{mathrm{Ba}}_{2}{mathrm{CuO}}_{6+ensuremath{delta}},$ the transition temperature ${T}_{c}$ has been found to change with time in a manner which depends on the sample's detailed temperature and pressure history. This relaxation behavior in ${T}_{c}$ is believed to originate from rearrangements within the oxygen sublattice. In the present high-pressure studies on ${mathrm{HgBa}}_{2}{mathrm{CuO}}_{4+ensuremath{delta}}$ to 0.8 GPa we find clear evidence for weak relaxation effects in strongly underdoped and overdoped samples ${(T}_{c}ensuremath{simeq}40--50mathrm{K})$ with an activation energy ${E}_{A}(1mathrm{bar})ensuremath{simeq}0.8--0.9mathrm{eV}.$ For overdoped ${mathrm{HgBa}}_{2}{mathrm{CuO}}_{4+ensuremath{delta}}$ ${E}_{A}$ increases under pressure more rapidly than previously observed for ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{6.41},$ yielding an activation volume of $+11ifmmodepmelsetextpmfi{}5{mathrm{cm}}^{3};$ the dependence of ${T}_{c}$ on pressure is markedly nonlinear, an anomalous result for high-${T}_{c}$ superconductors in the present pressure range, giving evidence for a change in the electronic and/or structural properties near 0.4 GPa." @default.
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- W2016540315 date "1999-10-01" @default.
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- W2016540315 title "Relaxation effects in the transition temperature of superconducting<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>HgBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2016540315 doi "https://doi.org/10.1103/physrevb.60.9827" @default.
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