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Published online on September 20, 2007, 10.1073/pnas.0704822104

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Physics
Quantum spin correlations through the superconducting-to-normal phase transition in electron-doped superconducting Pr0.88LaCe0.12CuO4-{delta}

( spin fluctuations | strongly correlated electron materials | superconductivity )

Stephen D. Wilson *, Shiliang Li *, Jun Zhao *, Gang Mu {dagger}, Hai-Hu Wen {dagger}, Jeffrey W. Lynn {ddagger}, Paul G. Freeman {sect}, Louis-Pierre Regnault ¶, Klaus Habicht ||, and Pengcheng Dai ***{dagger}{dagger}

*Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200; {dagger}National Laboratory for Superconductivity, Institute of Physics and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China; {ddagger}Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102; {sect}Institut Laue-Langevin, 6, rue Jules Horowitz, BP156-38042 Grenoble Cedex 9, France; Laboratoire de Magnétisme et Diffraction Neutronique, Service de Physique Statistique, Magnétisme et Supraconductivité, Départment de Recherche Fondamentale sur la Matiére Condensée, Commissariat á l'Énergie Atomique, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France; ||Hahn-Meitner-Institut, Glienicker Strasse 100, D-14109 Berlin, Germany; and **Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6393

Edited by Douglas J. Scalapino, University of California, Santa Barbara, CA, and approved July 26, 2007 (received for review May 24, 2007)

The quantum spin fluctuations of the S = 1/2 Cu ions are important in determining the physical properties of high-transition-temperature (high Tc) copper oxide superconductors, but their possible role in the electron pairing of superconductivity remains an open question. The principal feature of the spin fluctuations in optimally doped high-Tc superconductors is a well defined magnetic resonance whose energy (ER) tracks Tc (as the composition is varied) and whose intensity develops like an order parameter in the superconducting state. We show that the suppression of superconductivity and its associated condensation energy by a magnetic field in the electron-doped high-Tc superconductor Pr0.88LaCe0.12CuO4-{delta} (Tc = 24 K), is accompanied by the complete suppression of the resonance and the concomitant emergence of static antiferromagnetic order. Our results demonstrate that the resonance is intimately related to the superconducting condensation energy, and thus suggest that it plays a role in the electron pairing and superconductivity.

Author contributions: S.D.W. and P.D. designed research; S.D.W., S.L., J.Z., G.M., H.-H.W., J.W.L., P.G.F., L.-P.R., K.H., and P.D. performed research; S.D.W. analyzed data; and S.D.W., H.-H.W., J.W.L., and P.D. wrote the paper.

The authors declare no conflict of interest.

{dagger}{dagger}To whom correspondence should be addressed.

Pengcheng Dai, E-mail: daip{at}ornl.gov

www.pnas.org/cgi/doi/10.1073/pnas.0704822104
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