Current vs. Voltage Characteristics in High-Tc Superconductors.

Transverse voltage in high-Tc superconductors in zero magnetic fields

Longitudinal and transverse voltages have been measured on Bi based superconductors in zero external magnetic fields. In close vicinity of the superconducting transition nonzero transverse voltage has been observed while far away from Tc, both above and below no such voltage has been detected. The value of the transverse resistivity depends on the value of the transport current. Several models ...

Quiet and Noisy Metastable Voltage States in High-Tc Superconductors

The interaction between the telegraph noise and background voltage fluctuations in the current induced dissipative state of high-Tc BiSrCaCuO thin films has been investigated. Experimental time records of the voltage drop across current biased thin film strips show markedly different background noise traces in the up and down telegraph states. Detailed analysis demonstrates that fluctuations ar...

Voltage-biased I-V characteristics in the multiple Josephson junction model of high-Tc superconductors

Magnetism and high Tc superconductors

The magnetic properties of the copper oxide planes in hight T~ superconductors are represented by a planar 2-d antiferromagnet on a square lattice. We model the magnetic effect of the addition of holes through doping by the replacement of antiferromagnetic with ferromagnetic plaquettes thereby facilitating the creation of vorticeslantivortices. These magnetic

Electron Pairing in High-Tc Superconductors

In high-Tc cuprate superconductors, the pairing state of electrons is still spin-singlet, as in conventional BCS superconductors. But the orbital part of the wavefunction, order parameter or gap function, has a dx2−y2 symmetry, rather than the isotropic s-wave symmetry. This exotic symmetry has been confirmed by various experiments, especially the phase-sensitive ones. But the underlying mechan...