Strain-amplified structural modulation of Bi-cuprate high-Tcsuperconductors

Structural modulation in bismuth cuprate superconducting film with continuous epitaxial growth

“…Relatively thick films were prepared in the same manner, and investigated by XRD methods. The details in experimental can be found elsewhere [10][11][12]. Contrary to the multilayered structure, thick Bi-2212 films were prepared to investigate the effect of strain in Bi-2212 film.…”

“…Reciprocal space of such structure shows satellite peaks around the main reflection generated by unit cell structure. While symmetric fourfold satellites in intensity and distribution have been observed on single crystal [1][2][3][4][5][6][7][8][9], asymmetric satellite peaks were observed by X-ray reciprocal space mapping (XRSM) on epitaxial thin film [10][11][12].…”

“…However, aliovalent substitution replacing cations with different ion radius might induce internal strain as well as extra oxygen. Since the effect of strain is prominent in multilayered structure, Multilayered Bi-2212/Bi-2201 has been investigated on SC structure by XRSM method [11,12]. Contrary to the multilayered structure, strain in single layer film must be released as film continuously grows.…”

Local Noncentrosymmetric Structure of Bi2Sr2CaCu2O8+y by X-ray Magnetic Circular Dichroism at Cu K-Edge XANES

“…The misfit strain modulation and the charge density wave modulation induce local lattice fluctuations revealed by anisotropic response of photoemission [58,59] and by anisotropic xray absorption probing the local structure [60,61]. The CuO 2 lattice fluctuations could be driven by sawtooth modulations of the oxygens in the Bi2O2 slabs [62][63][64][65][66][67] which could produce a noncentrosymmetric superconducting phase in the CuO 2 planes. To study such lattice distortions one can use XMCD technique which is the ideal tool to detect the local noncentrosymmetric structure in layered materials [68][69][70].…”

- Polar Coincident Site Lattice Figure -

“…The aliovalent substitution of cations changes also oxygen content by replacing divalent strontium with trivalent lanthanum, for instance, so that the aliovalent substitution might affect oxygen content as well as inducing strain into crystal. To emphasize the effect of strain, multilayered and thick films were prepared and investigated in detail [15,16]. In multilayered structure the strain must be prominent, to the contrary, the strain must be released in thick film.…”