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• W1611565593 abstract "We have investigated the system ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{Ca}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Ce}}_{mathit{x}}$${mathrm{Cu}}_{2}$${mathrm{O}}_{8+mathrm{ensuremath{delta}}}$ (0ensuremath{le}xensuremath{le}0.5) to study the effect of substituting Ce for Ca on superconductivity in the ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{8+mathrm{ensuremath{delta}}}$ system (${mathit{T}}_{mathit{c}}$=90 K). It is observed that, on 25 at. % substitution of Ce for Ca, superconductivity is completely suppressed. This is relatively faster suppression of superconductivity compared to that seen on substituting other rare earths for Ca where ensuremath{sim}50 at. % substitution is required to suppress superconductivity. Magnetic susceptibility of the ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{Ca}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Ce}}_{mathit{x}}$${mathrm{Cu}}_{2}$${mathrm{O}}_{8+mathrm{ensuremath{delta}}}$ compounds is found to be weakly temperature dependent showing a small rise at low temperatures and a shallow minima at about 200 K. These results suggest the possible existence of Ce in a tetravalent state rather than in a trivalent state in this system. X-ray-diffraction studies on these compounds indicate a decrease in the c lattice parameter with increased substitution of Ce. This is consistent with nearly tetravalent Ce ion replacing the ${mathrm{Ca}}^{2+}$ ion since the size of ${mathrm{Ce}}^{3+}$ is comparable to that of ${mathrm{Ca}}^{2+}$, while that of ${mathrm{Ce}}^{4+}$ is smaller. textcopyright{} 1996 The American Physical Society." @default.
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• W1611565593 date "1996-02-01" @default.
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• W1611565593 title "Effect of substituting Ce at the Ca site on the high-temperature superconductor<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</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow…" @default.
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• W1611565593 doi "https://doi.org/10.1103/physrevb.53.2245" @default.
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