Spatially Inhomogeneous Competition between Superconductivity and the Charge Density Wave in YBa2Cu3O6.67

J. Choi, O. Ivashko, E. Blackburn, R. Liang, D. A. Bonn, W. N. Hardy, A. T. Holmes, N. B. Christensen, M. Hücker, S. Gerber, O. Gutowski, U. Rütt, M. v. Zimmermann, E. M. Forgan, S. M. Hayden, J. Chang

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Oct 01, 2019
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Received Date: 17th September 19

The charge density wave in the high-temperature superconductor YBa2Cu3O7−x (YBCO) is now known to have two different ordering tendencies differentiated by their c-axis correlations. These correspond to ferro- (F-CDW) and antiferro- (AF-CDW) couplings between CDW in neighbouring CuO2 bilayers. This discovery has prompted a number of fundamental questions. For example, how does superconductivity adjust to two competing orders and are either of these orders responsible for the electronic reconstruction? Here we use high-energy x-ray diffraction to study YBa2Cu3O6.67 as a function of magnetic field and temperature. We show that regions of the sample with F-CDW correlations suppress superconductivity more strongly than those with AF-CDW correlations. This implies that an inhomogeneous superconducting state exists, in which some regions show a weak or fragile form of superconductivity. By comparison of F-CDW and AF-CDW correlation lenghths, it is furthermore concluded that F-CDW ordering is sufficiently long-range to modify the electronic structure. Our study thus suggests that F-CDW correlations have an important impact on superconducting and normal state properties of underdoped YBCO.

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