Y89NMR study of the exchange coupling constant between theCuO

Spin dynamics in Gd x Y1−x Ba2Cu3O6.85 investigated by ESR of Gd spin probes

“…107 cm-' and EF = 0.3 eV [11], we estimate for the Gd 3 + ions in GYBCO685 an RKKY integral of the order of JRKKY 0.1-0.01 µeV. Its small value compared to the experimental 2JGd -Gd = 5 µeV suggests that in reality only a small part of the effective Gd-Gd exchange interaction could be mediated by the conduction electrons giving rise to an indirect exchange.…”

NMR experiment on high-T c oxides at Tokyo Metropolitan University

“…The second is TE I of 63,65Cu NQR in YBCO. The third is 1H NMR from probe material coated on YBCO and BSCCO.In this article I would introduce NMR expe¡ on High-T c oxides done in our laboratories in the physics department of Tokyo Metropolitan UniversityThe first work is a 89y NMR by Sakamoto et al [1] which was made on a standard High-Tc oxide of YBCO (Te-92 K) with Y site dilutely substituted by Gd ions. In the earlier stage of high-Te studies, one of apparently mysterious phenomena was that the Te was not reduced by the substitution of Y site by the magnetic rare earth ions, which was in contrast with the sharp reduction of T c in the conventional super conducting substances.…”

“…The first work is a 89y NMR by Sakamoto et al [1] which was made on a standard High-Tc oxide of YBCO (Te-92 K) with Y site dilutely substituted by Gd ions. In the earlier stage of high-Te studies, one of apparently mysterious phenomena was that the Te was not reduced by the substitution of Y site by the magnetic rare earth ions, which was in contrast with the sharp reduction of T c in the conventional super conducting substances.…”