MU-SR INVESTIGATION OF MAGNETISM AND SUPERCONDUCTIVITY IN (Y1-XPRX)BA2CU3O7

Muon spin rotation and relaxation techniques have been used to study the superconductivity and magnetism in (Y1-xPx)Ba2Cu3O7 (0≤x≤1) and PrBa2Cu3O6. Clear evidence for magnetic ordering of the Cu moments within the Cu-O planes is seen. Additionally, a lower magnetic transition is observed which, based upon previous work, has been associated with the ordering of Pr moments on the Y sublattice of the YBa2Cu3O7 structure. For x = 1, the upper Néel temperature TN1 is ∼270 K and the magnitude of the fully developed local magnetic field is ∼16 mT. Below the lower Néel temperature TN2 = 17 K, the magnitude of the static field is reduced to ∼ 12mT. For 0.4≤x≤0.54, there appears to be a coexistence region of long range magnetism and superconductivity. © 1990.