Journal
SCIENCE
Volume 337, Issue 6096, Pages 821-825Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1223532
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Funding
- European Commission [226716]
- European project SOPRANO under Marie Curie actions [PITNGA-2008-214040]
- German Science Foundation [SFB/TRR 80]
- Italian Ministry of Research [Ministero dell'Istruzione, Universita e Ricerca (MIUR)] [PRIN-20094W2LAY]
- Natural Sciences and Engineering Research Council of Canada
- National Research Council
- Canadian Institutes of Health Research
- Univ. of Saskatchewan
- CNR Institute
- European Union Community
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The concept that superconductivity competes with other orders in cuprate superconductors has become increasingly apparent, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of similar to 3.2 lattice units in the copper-oxide planes of the superconductors (Y,Nd)Ba2Cu3O6+x, with hole concentrations of 0.09 to 0.13 per planar Cu ion. The intensity and correlation length of the fluctuation signal increase strongly upon cooling down to the superconducting transition temperature (T-c); further cooling below T-c abruptly reverses the divergence of the charge correlations. In combination with earlier observations of a large gap in the spin excitation spectrum, these data indicate an incipient charge density wave instability that competes with superconductivity.
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