Defect and anisotropic gap-induced quasi-one-dimensional modulation of the local density of states ofYBa2Cu3O7−δ

Abstract

Motivated by recent angle-resolved photoemission spectroscopy (ARPES) measurement that superconducting ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ (YBCO) is consistent with a ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}+s$-symmetry gap, we show possible defect-induced quasi-one-dimensional modulations of the local density of states in YBCO. These stripelike structures are more conspicuous at higher measuring biases of the scanning tunneling microscopy (STM). Observation of these STM spectra would provide a unified picture of anisotropic gap on YBCO among STM, ARPES, and inelastic neutron scattering measurements.