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Quantum magnetic excitations from stripes in copper oxide superconductors

Nature volume 429, pages 534–538 (2004)Cite this article

Abstract

In the copper oxide parent compounds of the high-transition-temperature superconductors1 the valence electrons are localized—one per copper site—by strong intra-atomic Coulomb repulsion. A symptom of this localization is antiferromagnetism2, where the spins of localized electrons alternate between up and down. Superconductivity appears when mobile ‘holes’ are doped into this insulating state, and it coexists with antiferromagnetic fluctuations3. In one approach to describing the coexistence, the holes are believed to self-organize into ‘stripes’ that alternate with antiferromagnetic (insulating) regions within copper oxide planes4, which would necessitate an unconventional mechanism of superconductivity5. There is an apparent problem with this picture, however: measurements of magnetic excitations in superconducting YBa2Cu3O6+x near optimum doping6 are incompatible with the naive expectations7,8 for a material with stripes. Here we report neutron scattering measurements on stripe-ordered La1.875Ba0.125CuO4. We show that the measured excitations are, surprisingly, quite similar to those in YBa2Cu3O6+x (refs 9, 10) (that is, the predicted spectrum of magnetic excitations7,8 is wrong). We find instead that the observed spectrum can be understood within a stripe model by taking account of quantum excitations. Our results support the concept that stripe correlations are essential to high-transition-temperature superconductivity11.

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Figure 1: Schematic diagrams illustrating stripe order in real space and possible magnetic scattering in reciprocal space.
Figure 2: Constant-energy slices through the experimentally measured magnetic scattering from La1.875Ba0.125CuO4.
Figure 3: Simulations of constant-energy slices.
Figure 4: Experimental results for integrated magnetic scattering and dispersion of the excitations.

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Acknowledgements

We thank A. R. Moodenbaugh and Q. Li for assistance with sample characterization, and acknowledge discussions with E. Carlson, F. Essler, S. A. Kivelson, R. Konik, S. Sachdev and I. Zaliznyak. J.M.T., H.W., G.D.G. and G.X. are supported by the Office of Science, US Department of Energy. K.Y. and M.F. are supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology. Work was supported in part by the US–Japan Cooperative Research Program on Neutron Scattering.

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Authors and Affiliations

  1. Physics Department, Brookhaven National Laboratory, New York, Upton, 11973, USA

    J. M. Tranquada, H. Woo, G. D. Gu & G. Xu

  2. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK

    H. Woo & T. G. Perring

  3. Institute for Materials Research, Tohoku University, 980-8577, Sendai, Japan

    H. Goka, M. Fujita & K. Yamada

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  1. J. M. Tranquada
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Correspondence to J. M. Tranquada.

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Tranquada, J., Woo, H., Perring, T. et al. Quantum magnetic excitations from stripes in copper oxide superconductors. Nature 429, 534–538 (2004). https://doi.org/10.1038/nature02574

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