μSR investigation of magnetism and superconductivity in (Y1−xPrx)Ba2Cu3O7

Abstract Muon spin rotation and relaxation techniques have been used to study the superconductivity and magnetism in (Y 1− x P x )Ba 2 Cu 3 O 7 (0⩽ x ⩽1) and PrBa 2 Cu 3 O 6 . 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 YBa 2 Cu 3 O 7 structure. For x = 1, the upper Neel temperature T N1 is ∼270 K and the magnitude of the fully developed local magnetic field is ∼16 mT. Below the lower Neel temperature T N2 = 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.