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- W49206860 startingPage "11299" @default.
- W49206860 abstract "High-resolution anisotropic-thermal-expansion measurements of single-crystalline and oriented-grained ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ at the superconducting transition are presented for the first time. Discontinuities in the thermal-expansion coefficient ${mathrm{ensuremath{alpha}}}_{mathit{a}mathit{b}}$[ensuremath{Delta}${mathrm{ensuremath{alpha}}}_{mathit{a}mathit{b}}$=(15--23)ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}8}$ ${mathrm{K}}^{mathrm{ensuremath{-}}1}$], measured with a capacitance dilatometer, are found to occur in both samples. No discontinuity in ${mathrm{ensuremath{alpha}}}_{mathit{c}}$(ensuremath{Vert}ensuremath{Delta}${mathrm{ensuremath{alpha}}}_{mathit{c}}$ensuremath{Vert}1ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}8}$ ${mathrm{K}}^{mathrm{ensuremath{-}}1}$) is observed in either sample, although ${mathrm{ensuremath{alpha}}}_{mathit{c}}$(T) shows a distinct change of slope at ${mathit{T}}_{mathit{c}}$. The specific-heat discontinuity ensuremath{Delta}${mathit{C}}_{mathit{p}}$ of both samples was also measured and is used, along with the ensuremath{Delta}ensuremath{alpha}'s, to calculate the dependence of ${mathit{T}}_{mathit{c}}$ on uniaxial pressure and uniaxial strain to first order. ${mathit{T}}_{mathit{c}}$ is predicted to increase with pressure applied perpendicular to the c axis (${mathit{dT}}_{mathit{c}}$/${mathit{dp}}_{mathit{a}mathit{b}}$=0.04--0.09 K/kbar) and to be insensitive to pressure parallel to the c axis. Uniaxial strain, on the other hand, is found to increase ${mathit{T}}_{mathit{c}}$ about equally in both directions." @default.
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- W49206860 date "1990-06-01" @default.
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- W49206860 title "Anisotropic pressure dependence of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=italic>T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=italic>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>in single-crystal<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:…" @default.
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- W49206860 doi "https://doi.org/10.1103/physrevb.41.11299" @default.
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