Neutron diffraction study of the modulated structure of Bi2(Sr, Ca)3Cu2O8+y

BiSrCaCuO compounds rich in copper synthesized by molecular beam epitaxy structural and electric properties

“…This scan was obtained with a value of l corresponding to c ¼ 0:3176 nm; the substrate is used as a reference to fix the h and k values. In On the Q-scans, the diffraction peaks are sharp and correspond to the values a ¼ b ¼ 0:387 nm; in agreement with the values obtained in Bi-2212 compounds [6]. No trace of orthorhombicity was observed on this type of samples.…”

Stripe structure and Non-Homogeneity of the CuO2Plane by Joint EXAFS and Diffraction

“…On the other hand the amplitude of the second harmonic component, c2 =-0.0042 (c2 =-0.128 A), is comparatively larger. In fact the second harmonic was not considered in the neutron diffraction studies [6,7] while the X-ray diffraction studies resulted lower values for the same.…”

“…The BiO rocksalt layers release the internal tensile stress by forming stripes of stretched BiO lattice (distorted (D)-stripes) in the ab plane with low Bi density, variation of the BiO coordination geometry, interstitial oxygen and deviated stoichiometry, that are alternated by Bi rich stripes of undistorted BiO rocksalt lattice (undistorted (U)-stripes). The one-dimensional superstructure of the BiO layer is well established in the literature [6,7,9,11,[13][14][15]. Although various experiments [6,7,11,[3][4][5][6][7][8][9][10][11][12][13][14][15] report modulation of the Cu sub lattice mainly along the c-axis, the results disagree on the amplitude and anharmonic character of the modulation.…”

Research on high-temperature superconductors using the IBR-2 high-flux pulsed reactor

“…В работах [6] опубликованы данные об изучении на дифрактометре ДН 2 структуры висмутовых соединений "2 3 2". Исследовались керамики и моно кристалл (размером мм), приготовленные в ФИ АН ЧСФР и Политехническом институте в Праге.…”