Distinguishing between the bi-stripe and Wigner-crystal model: A crystallographic study of charge-orderedLa0.33Ca0.67

How to detect fluctuating stripes in the high-temperature superconductors

“…As we have seen (Lesson #4), interference between quasiparticles in 2D naturally produces ridges in N (k, E) along closed curves in k space, rather than the peaks observed in experiment. However, as was first recognized by Wang and Lee (2003), this result is modified by the extreme eccentricity of the contours of constant quasiparticle energy in a d-wave superconductor, where the dispersion in one direction is v F and in the other is proportional to ∆ 0 . Consequently, with finite experimental resolution, at energies less than ∆ 0 , one obtains peaks in the interference patterns at points in k space which connect the tips of the contours that surround each of the four distinct nodal points on the Fermi surface.…”

“…Indeed, all the low-energy magnetism that has been 2001; Ivanov et al, 2000;Kivelson et al, 2002;Polkovnikov et al, 2002b;Zhang, 1997;Zhang et al, 2002). Mori et al (1998a,b); Radaelli et al (1999); Wang et al (2000) reported to date is peaked at the commensurate ordering wavevector, Q AF , rather than at an incommensurate wavevector. This is rather strong evidence that at least spin-stripe order is absent in these materials.…”

“…As expected, the stripes induce oscillations in the LDOS with the period 4, but with energy dependences which reflect both the quasiparticle dispersion, and the specific stripe structure assumed. Impurity induced oscillations in the LDOS in a d-wave superconductor were computed by Byers et al (1993) and Wang and Lee (2003), and the effects of proximity to a stripe-ordered state, at RPA level, were investigated by Polkovnikov et al (2002b). In all cases, interference and stripe-related effects interact in fairly complex FIG.…”

“…10, as well. The solid lines in the figure were computed (using the method of Wang and Lee (2003)) from a global fit to the measured ARPES spectrum, as follows: 1) The location of the Fermi surface, ǫ(q) = 0 was computed from the phenomenological "band structure" that has been obtained (Damascelli et al, 2002;Norman et al, 1994) from a fit to ARPES experiments.…”

Observation of orbital ordering and Jahn-Teller distortions supporting the Wigner-crystal model in highly dopedBi1−xCaxMnO3Grenier1, Kiryukhin2, Cheong3 et al. 2007Phys. Rev. B191180View full textAdd to dashboardCite

“…Electron diffraction and high-resolution imaging were first interpreted according to the bi-stripe model, 27 but image simulations showed that the WC model was more likely 28 . The crystallographic structure of La 0.33 Ca 0.66 MnO 3 was obtained by Radaelli et al using neutron scattering.…”