Space symmetry of the basic structure and incommensurate modulations in (Pb,Bi)2Sr2CaCu2Ox superconductor single crystals

J. Schneck; L. Pierre; J. C. Tolédano; C. Daguet

doi:10.1103/PhysRevB.39.9624

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Space symmetry of the basic structure and incommensurate modulations in (Pb,Bi)2Sr2CaCu2Ox superconductor single crystals

J. Schneck, L. Pierre, J. C. Tolédano, C. Daguet

DOI 10.1103/PhysRevB.39.9624 · Physical Review B

T1

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Abstract

Lead-containing single crystals of the (2:2:1:2) phase have been studied on the basis of monochromatic x-ray precession camera investigations. Compared to the lead-free compound it is shown that the lead addition only affects the incommensurate properties preserving the space symmetry of the basic structure. The presence of two incommensurate modulations is pointed out, consistent with recent results, and their characteristics are specified. The type of modulation which also exists in the lead-free compound has its wavelength and its anharmonicity reduced by the lead addition. The other modulation is specific of lead-containing compounds and has the wave vector (0,(1/6.4,0). These results suggest that the lead atoms are substituted in part by the Bi atoms in the Bi-O layers of the structure.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2Ca2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	107	Pressure not reported	unknown
Bi2Sr2CaCu2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75	Pressure not reported	unknown