Andreev and single-particle tunneling spectra of underdoped cuprate superconductors.

Title Origin of the checkerboard pattern in scanning tunneling microscopy maps of underdoped cuprate superconductors

Andreev - Saint James reflections: a probe of cuprate superconductors

Electrical transport through a normal metal / superconductor contact at biases smaller than the energy gap can occur via the reflection of an electron as a hole of opposite wave vector. The same mechanism of electron-hole reflection gives rise to low energy states at the surface of unconventional superconductors having nodes in their order parameter. The occurrence of electron-hole reflections ...

Quasiparticles in the Pseudogap Phase of Underdoped Cuprate

Recent angle resolved photoemission [1] and scanning tunneling microscopy [2] measurements on underdoped cuprates have yielded new spectroscopic information on quasiparticles in the pseudogap phase. New features of the normal state such as particle-hole asymmetry, maxima in the energy dispersion and accompanying drops in the spectral weight of quasiparticles agree with the ansatz of Yang et al....

Andreev spectra and subgap bound states in multiband superconductors.

A theory of Andreev conductance is formulated for junctions involving normal metals (N) and multiband superconductors (S) and applied to the case of superconductors with nodeless extended s(+/-)-wave order parameter symmetry, as possibly realized in the recently discovered ferropnictides. We find qualitative differences from tunneling into s-wave or d-wave superconductors that may help to ident...

The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors

We review recent experimental and theoretical results on the interaction between single-particle excitations and collective spin excitations in the superconducting state of high-Tc cuprates. We concentrate on the traces, that sharp features in the magnetic-excitation spectrum (measured by inelastic neutron scattering) imprint in the spectra of single-particle excitations (measured e.g. by ngle-...