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Phys. Rev. Lett. 101, 077001 (2008) [4 pages]

Oxygen Isotope Effects on the Superconducting Transition and Magnetic States Within the Phase Diagram of Y1-xPrxBa2Cu3O7-δ

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R. Khasanov1,2,*, A. Shengelaya1,3, D. Di Castro1,4, E. Morenzoni2, A. Maisuradze1, I. M. Savić5, K. Conder6, E. Pomjakushina6,7, A. Bussmann-Holder8, and H. Keller1
1Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
3Physics Institute of Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
4”Coherentia” CNR-INFM and Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le A. Moro 2, I-00185 Roma, Italy
5Faculty of Physics, University of Belgrade, 11001 Belgrade, Serbia
6Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
7Laboratory for Neutron Scattering, Paul Scherrer Institute & ETH Zurich, CH-5232 Villigen PSI, Switzerland
8Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

Received 14 November 2007; published 11 August 2008

The various phases observed in all cuprate superconductors [superconducting (SC), spin-glass (SG), and antiferromagnetic (AFM)] were investigated with respect to oxygen-isotope (16O/18O) effects, using here as a prototype system of cuprates Y1-xPrxBa2Cu3O7-δ. All phases exhibit an isotope effect which is strongest where the respective phase terminates. In addition, the isotope effects on the magnetic phases (SG and AFM) are sign reversed as compared to the one on the superconducting phase. In the coexistence regime of the SG and SC phase a two-component behavior is observed where the isotope induced decrease of the superfluid density leads to a corresponding enhancement in the SG related density.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.077001
DOI:
10.1103/PhysRevLett.101.077001
PACS:
74.72.Bk, 74.25.Dw, 76.75.+i

*rustem.khasanov@psi.ch

 
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