Single crystal X-ray characterization of the incommensurate modulation in the high Tc superconductor Bi2Sr 2CaCu2O8

Abstract

2014 We have studied the incommensurate modulation in Bi2Sr2CaCu2O8 by single crystal X-ray diffraction. First and second order satellite reflections with wave vectors q1 = (0,0.211,1) and q2 = 2q1 have been measured. The period of the modulation along b is 25.59 Å. A preliminary analysis of the satellite intensities indicates that the modulation involves strong displacive components polarized along b and c. No low-temperature changes have been observed. The single crystals exhibit a large systematic mosaicity. J. Phys. France 49 (1988) 1987-1991 DECEMBRE 1988, Classification Physics Abstracts 61.50 74.70V Since the discovery of the bismuth based high Tc superconductors BiSrCu0 [1] and Bi Sr Cu 0 [2,3,4] a number of electron diffraction studies have revealed the existence of a basic subcell with supplementary superstructure or modulation effects [5 8]. Although high resolution electron microscopy (HREM) imaging has been able to give a deep insight into the nature of the incommensurate modulation in Bi2Sr2CaCu20s [5 8], X-ray studies can provide complementary information from macroscopic single crystals. In this paper we report on the photogra.phic and diffractometer study of single crystals of nominal composition Bi2Sr2CaCu20s. First and second order satellite reflections have been measured and their intensity distribution indicates that the modulation is essentially displacive with displacements in the (b,c) plane. No detectable changes are observed upon cooling to 13 K. The samples were prepared from a mixture of Biz03, SrC03, CaC03 and CuO in the Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphys:0198800490120198700

Cite this paper

@inproceedings{Albouy2017SingleCX, title={Single crystal X-ray characterization of the incommensurate modulation in the high Tc superconductor Bi2Sr 2CaCu2O8}, author={P Albouy and Roger Moret and Michel Potel and Patrick Gougeon and J. Padiou and J.-C. Levet and Hugues No{\"{e}l}, year={2017} }