Superconducting and magnetic phase boundaries in Bi2Sr2Ca1−xMxCu2O8, with M=Y, Gd, and Pr

Y. Gao; P. Pernambuco-Wise; J. E. Crow; J. O’Reilly; N. Spencer; H. Chen; R. E. Salomon

doi:10.1103/PhysRevB.45.7436

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Superconducting and magnetic phase boundaries in Bi2Sr2Ca1−xMxCu2O8, with M=Y, Gd, and Pr

Y. Gao, P. Pernambuco-Wise, J. E. Crow, J. O’Reilly, N. Spencer, H. Chen, R. E. Salomon

DOI 10.1103/PhysRevB.45.7436 · Physical Review B

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Abstract

The temperature dependences of the electrical resistivity, magnetic susceptibility, and specific heat have been measured in Bi2Sr2Ca1−xMxCu2O8, where M=Y, Gd, and Pr, for concentrations 0≤x≤1.0 and temperatures 1.6 K≤T≤300 K. All three dopants substitute a trivalent ion for divalent Ca and cause a depression of Tc observable in the resistivity and susceptibility. Both Pr and Gd retain their free-ion magnetic moment and appear to cause little, if any, magnetic pair breaking. Instead, the dominant suppression mechanism in all three cases is driven by the filling of the Cu 3d hole by the extra electron and the breaking of the Cu 3d–O 2p hybridization. Consequent localization of Cu 3d holes causes an observable antiferromagnetic ordering of Cu ions within the planes in the case of Y. The evidence for Cu ordering for Gd and Pr is obscured by the large Curie contribution to the magnetic susceptibility due to the rare-earth ions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	unknown
Bi2Sr2Ca1-xYxCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2Ca1-xGdxCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2Ca1-xPrxCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown