Direct observation of magnetic flux behavior in high-Tc oxide superconductors.

Magnetic-flux dynamics of high-Tc superconductors in weak magnetic fields.

Magnetic resonant excitations in High-Tc superconductors

More than fifteen years after the high temperature superconductivity discovery, antiferromagnetic (AF) fluctuations pairing mechanism[1] is still highly controversial. However, inelastic neutron scattering (INS) measurements have successfully brought to light the existence of unusual AF excitations that develop below Tc and could be the hallmark of an unexpected spin-1 collective mode, tightly ...

Magnetic excitations in the stripe phase of high-Tc superconductors

The magnetic excitations in the stripe phase of high-Tc superconductors are investigated in a model of spin ladders which are effectively coupled via charged stripes. Starting from the effective single-triplon model for the isolated spin ladder, the quasi-one-dimensional spin system can be described straightforwardly. Very good agreement is obtained with recent neutron scattering data on La15/8...

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 ...

Optical nonreciprocity in magnetic structures related to high-Tc superconductors.

Rotation of the plane of polarization of reflected light (Kerr effect) is a direct manifestation of broken time-reversal symmetry and is generally associated with the appearance of a ferromagnetic moment. Here I identify magnetic structures that may arise within the unit cell of cuprate superconductors that generate polarization rotation despite the absence of a net moment. For these magnetic s...