Abstract
205Tl-NMR in Tl2Ba2Can-1CunO8−δ for differentn and δ is reviewed. Forn=2,3 the205Tl spectra consist of two lines. The main line arises from Tl(1) in the TlO-layer whereas the defect line belongs to Tl(2) in the Ca-layers between the CuO2-layers. The temperature dependent Knight shift of the Tl(2) (defect) line is caused by the hyperfine interaction with the CuO2-layer and is strongly related to the oxygen content of the sample. We find quasipartticle behavior for the T1(2) line similar to the89Y Knight shift in the YBa2Cu3O6+δ system. In contrast the T1(1) line shows strong antiferromagnetic correlations with indication of pseudo spin gap opening above the superconducting transition temperatureTc.
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Winzek, N., Mehring, M. 205Tl NMR in the Cuprate Superconductor Tl2Ba2CaCu2O8−δ: Evidence for a pseudo spin gap. Appl. Magn. Reson. 3, 535–547 (1992). https://doi.org/10.1007/BF03166282
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DOI: https://doi.org/10.1007/BF03166282