Transverse- and zero-field muon SR investigation of magnetism and superconductivity in (Y(1-x)Pr(x)Ba2Cu3O7)

Zero-field muon-spin-rotation (muSR) measurements on (Y(1-x)Pr(x)Ba2Cu3O7 (x = 1.0, 0.8, 0.6, and 0.54) show evidence for antiferromagnetic ordering of the Cu moments within the Cu-O planes, with Neel temperatures 285, 220, 35, 30, and 20 K respectively. For x = 1.0 the local muon magnetic field is approximately 16 mT, but decreases to approximately 12 mT at 17 K, due to additional magnetic ordering. The zero-field data, in conjunction with transport data, allow construction of a complete diagram for this system. Transverse-field (1 kOe) muSR data for x = 0.2 ( Tc = 75 K) show that the muon depolarization is determined primarily by the Cu nuclear moments for T is greater than Tc. Fitting the superconducting-state data to a BCS model yields an extrapolated zero-temperature magnetic penetration depth of 2170 A.