Effect of Rhombic Distortion on the Polarized X-Ray Absorption Spectra in HighT_cSuperconductors

Local lattice instability and superconductivity inLa1.85Sr0.15Cu1−xZhang1, Ōyanagi2 2009Phys. Rev. B715970View full textAdd to dashboardCite

“…18 Lattice instability at this length scale is expected to produce exotic latticedynamical properties such as a certain kind of phonon mode softening and strong coupling between the lattice and charge degrees of freedom, leading to polaron formation. Regarding the specific nature of the polaron, two different types of Cu-O bond-stretching modes can be considered as possible candidates: the pseudo-Jahn-Teller mode; 19,20 and the Q 2 -type mode. 21,22 These modes are schematized in Fig.…”

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

“…45' from the Cu-0-Cu direction, is found to be temperature plane) would act as potential barrier between the U stripes formed by undistorted lattice (flat Cu02 plane). In fact the elongation of the Cu-Oblanar) bonds, by about 0.09 A, in the D-stripes directly changes the hopping integral in the plane [22] and modifies the band structure mainly at the M point of the Brillouin zone (BZ) giving a potential barrier between the stripes. Therefore the electronic structure of the modulated CuOz plane can be described as superlattice of quantum wires the formation of superlattice subbands [23].…”

The stripe critical point for cuprates

“…There are now a growing number of experiments providing evidence for electron-lattice interaction being a necessary parameter for characterizing the metallic state of the cuprates [20][21][22][23][24][25][26][27]. Recent experiments on the isotope effects [28][29][30] have further indicated the need to include the electron-lattice interaction as one of the parameters for describing the complex metallic phase of the cuprate superconductors.…”