Ferron-like States in Yba 2 Cu 3 O 6+x

Contributions of CuO planes and CuO chains on the transport

We have investigated the contributions of CuO planes and CuO chains on the transport properties of YBa Cu O by 2 2 4 8 Ž . Ž . measuring the electrical resistivity and thermoelectric power S of Y Pr Ba Cu Zn O , Y Ca Ba Cu O and 1yx x 2 1yy y 4 8 1yx x 2 4 8 Ž . YBa Cu Ga O . Pr reduces the mobile carrier concentration in the CuO planes in YBa Cu O , as a consequence, the 2 1yx x 4 8 2 2 4 8 Ž ...

Comment on "Photoemission study of YBa(2)Cu(3)O(y) thin films under light illumination".

Heterojunctions of Nb-doped SrTiO3 substrate and YBa(2)Cu(3)O(y) thin films show photoconductivity and photovoltaic effects due to photocarrier injection. Photocarrier injection is expected to be a new carrier doping method in strongly correlated systems instead of chemical substitution. We have studied the nature of photocarrier injection in YBa(2)Cu(3)O(y)/SrTiO(3):Nb using x-ray photoemissio...

Inductance mode characteristics of a ceramic YBa 2 Cu 3 O 7 - x radio - frequency superconducting quantum interference device at 77

AC Magnetic Susceptibility Technique for the Characterization of High Temperature Superconductors

The absolute magnetic susceptibility as a function of temperature with different amplitude and frequency of the applied field is used to characterize the magnetic properties of high T c – superconductors. In the present work our design of a laboratory-built ac susceptometer based on the mutual inductance method using local facilities is demonstrated and tested. The setup have moment precision o...

Femtosecond response of quasiparticles and phonons in superconducting YBa(2)Cu(3)O(7-δ) studied by wideband terahertz spectroscopy.

We measure the anisotropic midinfrared response of electrons and phonons in bulk YBa(2)Cu(3)O(7-δ) after femtosecond photoexcitation. A line shape analysis of specific lattice modes reveals their transient occupation and coupling to the superconducting condensate. The apex oxygen vibration is strongly excited within 150 fs, demonstrating that the lattice absorbs a major portion of the pump ener...