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We have characterized as-grown and thermally treated YBaCuO single crystals by ESR, Raman spectroscopy, magnetic susceptibility, X-ray and neutron diffraction measurements. The as-grown crystals are tetragonal and are superconducting with an onset temperature of 30 K. They show an ESR signal which behaves as a localized Cu²⁺Â ion with tetragonal symmetry and presumably originates from copper chain atoms that are octahedrally coordinated byÂ sixÂ oxygen neighbors. The temperature dependence of the ESR between 150 and 270 K shows paramagnetic behavior and also dynamical features. Below 90 K, the ESR signal disappears reversibly. A likely explanation is that the onset ofÂ localÂ superconductivity frustrates the spins responsible for the ESR signal.

Single crystal ESR studies on tetragonal YBa₂Cu₃O_6+x D. Shaltiel, H. Bill, P. Fischer, M. François, H. Hagemann, M. Peter, Y. Ravi Sekhar, W. Sadowski, H.J. Scheel, G. Triscone, E. Walker and K. Yvon Physica C: Superconductivity, 158 (3) (1989), p424-432 DOI:10.1016/0921-4534(89)90239-6 \| unige:3068 \| Abstract \| Article PDF
We have characterized as-grown and thermally treated YBaCuO single crystals by ESR, Raman spectroscopy, magnetic susceptibility, X-ray and neutron diffraction measurements. The as-grown crystals are tetragonal and are superconducting with an onset temperature of 30 K. They show an ESR signal which behaves as a localized Cu²⁺Â ion with tetragonal symmetry and presumably originates from copper chain atoms that are octahedrally coordinated byÂ sixÂ oxygen neighbors. The temperature dependence of the ESR between 150 and 270 K shows paramagnetic behavior and also dynamical features. Below 90 K, the ESR signal disappears reversibly. A likely explanation is that the onset ofÂ localÂ superconductivity frustrates the spins responsible for the ESR signal.

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