Superconductivity and Raman scattering in Bi2Sr2Ca1−xPrxCu2Oy

X. H. Chen; M. Yu; G. G. Qian; Z. S. Liu; L. Z. Cao; J. Zou; C. Y. Xu

doi:10.1103/PhysRevB.57.5082

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Superconductivity and Raman scattering in Bi2Sr2Ca1−xPrxCu2Oy

X. H. Chen, M. Yu, G. G. Qian, Z. S. Liu, L. Z. Cao, J. Zou, C. Y. Xu

DOI 10.1103/PhysRevB.57.5082 · Physical Review B

T1

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Abstract

Polycrystalline samples of Bi2Sr2Ca1−xPrxCu2Oy (x=0−1) have been characterized by x-ray diffraction, resistivity, and Raman scattering measurements. Superconducting samples (x<0.6) show a T-linear resistivity, and dρ/dT is consistent with the Drude model. Upon replacement of Ca by Pr, an increase of the excess oxygen incorporated into Bi2O2 double layers causes an elongation of the Bi−O(2)Sr bond length, which is an important factor, resulting in softening of the O(2)Sr Ag phonon. A downshift of the O(1)Cu B1g phonon with increasing x in Pr-doped Bi2212 arises from an increase of the average Ca2+/Pr3+ radius. The origin of this softening is the same as that in Y-doped Bi2212, Y123, and Y124 systems.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2Ca1-xPrxCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
Bi2Sr2PrCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	unknown