Abstract
Using the original technique of measuring very short spin-lattice relaxation times T1, the electron-spin relaxation has been investigated in a number of HTSC materials and related phases. The relaxation of Gd3+ ions in GdBa2Cu3O6+x is shown to be affected by both quasiparticle and antiferromagnetic fluctuations, the latter being increased at lower oxigen content. The pseudo-spin gap of about 200 K is found for both contributions. For Cu2+ EPR in YBaCuO, the T1 values reveal several types of paramagnetic centers including the “green phase” Y2BaCuO5. In the fulleride RbC60, the measuring of T1 and T2 yielded additional support for 1D conductivity and allowed to monitor the metal-insulator phase.
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