Effect of substituting Ce at the Ca site on the high-temperature superconductor Bi2Sr2CaCu2O8+δ

Awana, V. P. S. ; Menon, Latika ; Malik, S. K. (1996) Effect of substituting Ce at the Ca site on the high-temperature superconductor Bi2Sr2CaCu2O8+δ Physical Review B, 53 (5). pp. 2245-2248. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v53/i5/p2245_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.53.2245

Abstract

We have investigated the system Bi2Sr2Ca1-xCexCu2O8+δ(0≤x≤0.5) to study the effect of substituting Ce for Ca on superconductivity in the Bi2Sr2CaCu2O8+δ system (Tc=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 ~50 at. % substitution is required to suppress superconductivity. Magnetic susceptibility of the Bi2Sr2Ca1-xCexCu2O8+δ 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 Ca2+ ion since the size of Ce3+ is comparable to that of Ca2+, while that of Ce4+ is smaller.

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