Oxygen isotope effect on superconductivity and magnetism in Y_1-xPr_xBa_2Cu_3O_7-\delta

R. Khasanov, A. Shengelaya, 2 D. Di Castro, 3 E. Morenzoni, A. Maisuradze, I.M. Savić, K. Conder, E. Pomjakushina, 7 and H. Keller Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland Physics Institute of Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia ”Coherentia” CNR-INFM and Dipartimento di Fisica, Universita’ di Roma ”La Sapienza”, P.le A. Moro 2, I-00185 Roma, Italy Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland Faculty of Physics, University of Belgrade, 11001 Belgrade, Serbia and Montenegro Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland Laboratory for Neutron Scattering, Paul Scherrer Institute & ETH Zurich,CH-5232 Villigen PSI, Switzerland Oxygen isotope (O/O) effects (OIE’s) on the superconducting transition (Tc), the spinglass ordering (Tg), and the antiferromagnetic ordering (TN) temperatures were studied for Y1−xPrxBa2Cu3O7−δ as a function of Pr content (0.0 ≤ x ≤ 1.0). The OIE on Tc increases with increasing x up to x ≈ 0.55, where superconductivity disappears. For decreasing x the OIE’s on TN and Tg increase down to x ≈ 0.7 where antiferromagnetic order and down to x ≈ 0.3 where spin-glass behavior vanish, respectively. The OIE’s on Tg and TN are found to have opposite signs as compared to the OIE on Tc. All OIE’s are suggested to arise from the isotope dependent mobility (kinetic energy) of the charge carriers.