Pair breaking by chain oxygen disorder in light-ion irradiated YBa2Cu3Ox thin films
نویسندگان
چکیده
We report on the effect of oxygen disorder in the CuO chains on the superconducting properties of oxygen depleted YBa2Cu3Ox(YBCO). While moderate disorder, induced thermally, depresses the critical temperature as a result of a reduced carrier concentration, strong oxygen disorder and chain fragmentation induced by low energy ~80 keV! He irradiation suppresses the critical temperature beyond the values expected from the reduction of the carrier density. This provides an experimental evidence of pair breaking by chain disorder and outlines the importance of chain states in the pairing mechanism in the YBCO family.
منابع مشابه
Persistent photoconductivity in high Tc grain boundary Josephson junctions
We observed persistent photoconductivity in YBa2Cu3Ox bicrystal grain boundary Josephson junctions. Upon illumination of these grain boundary Josephson junctions, the normal state resistance decreases and the critical current increases. This strongly suggests that the grain boundary in these films consists of oxygen depleted YBa2Cu3Ox . A comparison with the persistent photoconductivity in oxyg...
متن کاملPhoto-induced increase of the superconducting coherence lengths in oxygen-deficient YBa2Cu3Ox thin films
YBa2Cu3Ox (x ≈ 6.6) thin films were photodoped with white light at various temperatures from 70 K to 290 K. Before and after the excitation, the magnetoconductivity was measured in a magnetic field B = 0.5 T, and the experimental results were fitted to the Aslamazov-Larkin theory of superconducting order-parameter fluctuations to determine the superconducting coherence lengths, ξc(0) and ξab(0)...
متن کاملMechanisms of photodoping in oxygen-deficient YBa2Cu3Ox films studied by in situ transport measurements
In situ studies of the superconducting and normal-state transport properties in partially oxygen-depleted, metallic YBa2Cu3Ox (Tc ,mid'52 K) thin films exposed to long-term white-light illumination ~photodoping! are reported. We observed that the effects of photoexcitation strongly depended on the temperature at which the photodoping was performed. The Hall number increased during the illuminat...
متن کاملIon-irradiation-induced ferromagnetism in undoped ZnO thin films
We have introduced defects in ZnO epitaxial thin films by swift heavy Ag ion irradiation and investigated systematically their magnetic, electrical and optical properties. Oxygen annealed ZnO films are epitaxial single crystals that exhibit no long-range magnetic order. However, in this paper it is shown that room-temperature ferromagnetism (RTFM) can be introduced in a controlled manner in the...
متن کاملPreparation and Characterization of WO3 Electrochromic Films Obtained by the Sol-Gel Process
Tungsten trioxide (WO3) films have been coated on indium thin oxide (ITO) conductive glass substrate, using aqueous solution of peroxotungstic acid (PTA) by the sol-gel dip coating method. X-ray diffractometery (XRD) analysis confirmed monoclinic and triclinic structure for the film and powdered WO3 respectively. Fourier transforms infrared spectroscopy (FT-IR) exhibit...
متن کامل