The nuclear relaxation rate, 1/T1, and Knight shift have been investigated between 4.2 K and 300 K by 205Tl nuclear magnetic resonance (NMR) for Tl2Ba2Ca1Cu2O8+δ with Tc = 100 K. It has been observed that there are two Tl sites possessing a different electronic state. The distinct decrease of 1/T1 and Knight shift for both Tl sites has been found just below an onset temperature of T0 = 115 K rather than a zero-resistance temperature of Tc = 100 K. Above T0, 1/T1 is not of the Korringa-type with T1T = const., but exhibits weak temperature dependence, resembling the behavior of the CuO2 plane site of YBa2Cu3O7. The 1/T1 for Tl sites possessing no magnetic moments is demonstrated to reflect the strong spin correlation above T0 through the hybridization with the Cu d-wave function.
ASJC Scopus subject areas
- Physics and Astronomy(all)