Vortex Cutting in YBa2Cu3O7-δ

Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7-δ.

The observation by scanning tunnelling spectroscopy of Abrikosov vortex cores in the high-temperature superconductor YBa2Cu3O7-δ (Y123) has revealed a robust pair of electron-hole symmetric states at finite subgap energy. Their interpretation remains an open question because theory predicts a different signature in the vortex cores, characterized by a strong zero-bias conductance peak. Here, we...

Vortex lattice structures in YBa2Cu3O7

We describe small-angle neutron scattering (SANS) studies of vortex structures in the high Tc superconductor YBazCu307 in the mixed state. The SANS technique is a unique tool for probing the crystallography of a flux line arrangement in the bulk sample that can measure the values of the characteristic lengths and the effect of defects on lattice arrangement and orientation extremely accurately....

Specific Heat of YBa2Cu3O7−δ Single Crystals: Implications for the Vortex Structure

The anisotropy of the magnetic field dependence of the specific heat of YBa2Cu3O7−δ can be used to identify different low-energy excitations, which include phonons, spin2 particles, and electronic contributions. With a magnetic field H applied perpendicular to the copper oxide planes, we find that the specific heat includes a linearT term proportional to √ H. The nonlinear field dependence of t...

Vortex Lattice Instabilities in YBa2Cu3O7-x Nanowires

High-resolution focused ion beam lithography has been used to fabricate YBa₂Cu₃O7-x (YBCO) wires with nanometric lateral dimensions. In the present work, we investigate Flux-flow instabilities in nanowires of different widths, showing sudden voltage switching jumps from the superconducting to the normal state. We present an extensive study on the temperature and field dependence of the switchin...

NMR and Vortex Lattice Melting in YBa2Cu3O7