Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors

H. Eisaki; N. Kaneko; D. L. Feng; A. Damascelli; P. K. Mang; K. M. Shen; Z. X. Shen; M. Greven

doi:10.1103/PhysRevB.69.064512

Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors

H. Eisaki, N. Kaneko, D. L. Feng, A. Damascelli, P. K. Mang, K. M. Shen, Z. X. Shen, M. Greven

Physics and Astronomy (Twin Cities)

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Abstract

We examine the effect on the superconducting transition temperature (T_c) of chemical inhomogeneities in Bi₂Sr₂CuO_6+δ and Bi₂Sr₂CaCu₂O_8+δ single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of T_c. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi₂Sr_1.6Ln_0.4CuO_6+δ results in a monotonic decrease of T_c with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the T_c of Bi₂Sr₂CaCu₂O₈+δ can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

Original language	English (US)
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	69
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.69.064512
State	Published - Feb 27 2004

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title = "Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors",

abstract = "We examine the effect on the superconducting transition temperature (Tc) of chemical inhomogeneities in Bi2Sr2CuO6+δ and Bi2Sr2CaCu2O8+δ single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of Tc. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi2Sr1.6Ln0.4CuO6+δ results in a monotonic decrease of Tc with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the Tc of Bi2Sr2CaCu2O8+δ can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.",

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AU - Eisaki, H.

AU - Kaneko, N.

AU - Feng, D. L.

AU - Damascelli, A.

AU - Mang, P. K.

AU - Shen, K. M.

AU - Shen, Z. X.

AU - Greven, M.

PY - 2004/2/27

Y1 - 2004/2/27

N2 - We examine the effect on the superconducting transition temperature (Tc) of chemical inhomogeneities in Bi2Sr2CuO6+δ and Bi2Sr2CaCu2O8+δ single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of Tc. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi2Sr1.6Ln0.4CuO6+δ results in a monotonic decrease of Tc with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the Tc of Bi2Sr2CaCu2O8+δ can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

AB - We examine the effect on the superconducting transition temperature (Tc) of chemical inhomogeneities in Bi2Sr2CuO6+δ and Bi2Sr2CaCu2O8+δ single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of Tc. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi2Sr1.6Ln0.4CuO6+δ results in a monotonic decrease of Tc with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the Tc of Bi2Sr2CaCu2O8+δ can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

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Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors

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