A new approach is proposed for analysis of the excess conductivity σ′(T) arising below a
characteristic temperature T*⪢ T c in YBa 2 Cu 3 O 7− y (YBCO) films with different oxygen …

The fluctuation conductivity in YBa 2 Cu 3 O 7− y (YBCO) films with T≈ 80 K is investigated
for the first time. Unlike the optimally doped samples, these films exhibit a transition from a …

Fluctuation conductivity in YBa 2 Cu 3 O7− y (YBCO) films with different oxygen
concentrations is investigated. All of the samples exhibit a clear transition from the Maki …

[en] The fluctuation conductivity of YBa 2 Cu 3 O 7--y (YBCO) films with Tc approx 80 K has
been studied for the first time. A distinct transition from the Maki-Thompson fluctuation …

Results of measurements of the temperature dependence of the absorption spectra of YBa 2
Cu 3 O 6+ x films in the antiferromagnetic and metallic (superconducting, T c= 88 K) phases …

The doublet structure of the electron–bimagnon absorption band with maxima at 2.145 and
2.28 eV is observed for the first time for the metallic phase of YBa 2 Cu 3 O 6+ x with x= 0.85 …

The theoretical aspects of research on the role of Jahn–Teller interactions in quasi-two-
dimensional cuprate antiferromagnets and high-T c superconductors (HTSCs) are analyzed …

Narrow-band spectral features demonstrating a high sensitivity to the development of the
pseudogap state are detected in metallic films of YBa 2 Cu 3 O 6+ x with T c≈ 51 and 74 K …

The results of measurements of the absorption spectra of YBa {sub 2} Cu {sub 3} O {sub 6+
x} films in the antiferromagnetic (AFM) and metallic (superconducting, T {sub c}= 88 K) …

The electric conductivity of YBa 2 Cu 3 O 7− δ ceramic high-T c superconductors with
different oxygen contents (6.28⩽ 7− δ⩽ 6.95) is measured in the temperature range∼ 20 …