Two-Component Behavior of Cuprate Superconductors from NMR Shifts
NMR spin shift data of La1:85Sr0:15CuO4, HgBa2CuO4+ at ambient pressure, andof YBa2Cu4O8 at pressure up to 63 kbar are discussed that fail the traditional single-electronicuid picture used for the discussion of NMR data. Instead the results point to a commonexplanation for all three systems in terms of two electronic components. One of them hasa temperature-dependent magnetic susceptibility while the second component, as well as itscoupling to the rst component, are constant above the superconducting transition temperatureTc. All susceptibilities vanish below Tc.
B. J. Ruck and T. Kemmitt
D. Rybicki et al., "Two-Component Behavior of Cuprate Superconductors from NMR Shifts", Materials Science Forum, Vol. 700, pp. 1-6, 2012