Energy-dependent checkerboard patterns in cuprate superconductors
Degang Zhang, C. S. Ting
DOI 10.1103/PhysRevB.69.012501 · Physical Review B
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Abstract
Motivated by the recent scanning tunneling microscopy (STM) experiments [J. E. Hoffman et al., Science 297, 1148 (2002); K. McElroy et al., Nature (London) 422, 592 (2003)], we investigate the real-space local density of states (LDOS) induced by weak disorder in a d-wave superconductor. We first present the energy- dependent LDOS images around a single weak defect at several energies, and then point out that the experimentally observed checkerboard patterns in the LDOS could be understood as a result of quasiparticle interference by randomly distributed defects. It is also shown that the checkerboard pattern oriented along 45° to the Cu-O bonds at low energies would transform to that oriented parallel to the Cu-O bonds at higher energies. This result is consistent with the experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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