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- W2037761569 abstract "Measurements of the effects of hydrostatic pressure up to 1 GPa on the a-axis resistance ${mathit{R}}_{mathit{a}}$ of monocrystalline ${mathrm{Bi}}_{2.2}$(Sr,Ca${)}_{2.8}$${mathrm{Cu}}_{2.0}$${mathrm{O}}_{8+mathit{y}}$ high-${mathit{T}}_{mathit{c}}$ superconductor are reported. The superconducting transition temperature ${mathit{T}}_{mathit{c}}$ increases linearly under pressure with ${mathit{dT}}_{mathit{c}}$/dP equal to 1.3ifmmodepmelsetextpmfi{}0.2, 2.4ifmmodepmelsetextpmfi{}0.2, and 1.9ifmmodepmelsetextpmfi{}0.2 (K ${mathrm{GPa}}^{mathrm{ensuremath{-}}1}$) at the onset, midpoint, and offset of the resistance-temperature curve, respectively. d ln${mathit{T}}_{mathit{c}}$/d lnV has been calculated thermodynamically using the bulk modulus determined for ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{8+mathit{y}}$ single crystals. A value of -1.5 is obtained and it is noted that some previous estimates for ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{8+mathit{y}}$ using the bulk modulus determined for ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathit{x}}$ are inappropriately large. This value of -1.5 falls in the range between those estimated from the 3-d BCS theory and the resonating-valence-bond theory.The pressure derivative ln${mathrm{ensuremath{rho}}}_{mathit{a}}$/dP of the a-axis electrical resistivity remains almost constant between 116 and 296 K in the pressure range of the experiments, having a value of -25.5ifmmodepmelsetextpmfi{}0.2% ${mathrm{GPa}}^{mathrm{ensuremath{-}}1}$ at 296 K, which is larger than those reported previously for ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{8+mathit{y}}$ high-${mathit{T}}_{mathit{c}}$ superconductors. An empirical equation used for the temperature dependence of the electrical resistivity ensuremath{rho} in oxygen-deficient superconductors has been adapted to describe both temperature and pressure dependences of the in-plane resistance of ${mathrm{Bi}}_{2.2}$(Sr,Ca${)}_{2.8}$${mathrm{Cu}}_{2.0}$${mathrm{O}}_{8+mathit{y}}$. Application of the conventional theory of the electrical resistivity of metals shows that the pressure dependence of the normal-state electrical resistance of high-${mathit{T}}_{mathit{c}}$ superconductors is dominated by pressure dependence of the mobile charge-carrier density and that the effect of pressure on lattice vibrational scattering plays only a minor role." @default.
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- W2037761569 date "1995-04-01" @default.
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- W2037761569 title "Hydrostatic-pressure effects on the<i>a</i>-axis resistance of monocrystalline<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2.2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(Sr,Ca<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2.8</mml:mn></mml:mrow></mml:msub…" @default.
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- W2037761569 doi "https://doi.org/10.1103/physrevb.51.9167" @default.
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