ESR investigation of the superconducting critical state in YBaCuO single crystals

Scanning ESR-microprobe studies of the flux distribution in type-II superconductors

“…This magnitude is twenty times larger than j, obtained from a cusp. The latter value is significantly smaller than jc obtained earlier by us in the framework of the Bean model [19] from the AHR dependence on cooling field (4. 104 A/cm2).…”

“…Notice also that the field decay upon spacing a probe from the crystal surface in the z-direction is well described by exp(-27cz/1), where characteristic scale 1 is of the order of the strip width [19]. This allows us to fit Eqs.…”

Inhomogeneity of the intrinsic magnetic field in superconducting YBa2Cu3OXcompounds as revealed by a rare-earth EPR probe

“…The lineshape, the position and narrow linewidth of DPPH itself are practically temperature independent. In the decoration experiments, however, they depend not only from the temperature but from other detection conditions, such as a frequency and a value of the modulation field, the sweep direction of the applied magnetic field, et al This EPR technique in reference to HTSC, firstly presented by Rakvin et al [4,5], is being actively used and developed (see [6,7,8,9,10,11], for instance).…”

Vortex Excitations Above T c in the Cuprate Superconductor Bi2Sr2Ca2Cu3O10 as Revealed by ESR

“…2a for two orientations, parallel (H a ab) and perpendicular (H a c). As noted above, the H R and H ⊥ R values differ from the reso- When the applied field is perpendicular to the SC sur-face (H a c in the present case), the local field distribution is determined by the field variations inside the vortex lattice 16,18 and by the vortex density gradients 21 . If the applied field increases as in the present case, then the internal field in the central part decreases due to the presence of vortices and their gradients (see Fig.…”