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Condens. Matter 2018, 3(3), 23; https://doi.org/10.3390/condmat3030023

Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR

1
Felix Bloch Institute for Solid State Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany
2
The MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
3
Walther-Meißner-Institute for Low Temperature Research, Walther-Meißnerstr. 8, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Received: 26 June 2018 / Revised: 17 July 2018 / Accepted: 27 July 2018 / Published: 29 July 2018
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Abstract

Cuprate superconductors still hold many open questions, and recently, the role of symmetry breaking electronic charge ordering resurfaced in underdoped cuprates as a phenomenon that competes with superconductivity. Here, unambiguous nuclear magnetic resonance (NMR) proof is presented for the existence of local charge ordering in nearly optimally doped YBa2Cu3O6.9, even up to room temperature. Increasing pressure and decreasing temperature leads to the highest degree of order in the sense that the two oxygen atoms of the unit cell of the CuO2 plane develop a charge difference of about 0.02 holes, and order throughout the whole crystal. At ambient conditions, a slightly smaller charge difference and a decreased order is found. Evidence from literature data suggests that this charge ordering is ubiquitous to the CuO2 plane of all cuprates. Thus, the role of charge ordering in the cuprates must be reassessed. View Full-Text
Keywords: cuprates; charge order; NMR; high pressure cuprates; charge order; NMR; high pressure
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Reichardt, S.; Jurkutat, M.; Guehne, R.; Kohlrautz, J.; Erb, A.; Haase, J. Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR. Condens. Matter 2018, 3, 23.

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