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Science. 2016 Feb 5;351(6273):576-8. doi: 10.1126/science.aad1824.

Nematicity in stripe-ordered cuprates probed via resonant x-ray scattering.

Author information

1
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
2
Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
3
Canadian Light Source, Saskatoon, Saskatchewan, S7N 2V3, Canada.
4
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada. Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada.
5
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
6
Synthèse Propriétés et Modélisation des Matériaux (SP2M), UMR 8182, Université Paris-Sud, 91405 Orsay Cedex, France.
7
Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
8
Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany. Paris Lodron University Salzburg, Chemistry and Physics of Materials, Hellbrunner Strasse 34, 5020 Salzburg, Austria.
9
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada. dhawthor@uwaterloo.ca.

Abstract

In underdoped cuprate superconductors, a rich competition occurs between superconductivity and charge density wave (CDW) order. Whether rotational symmetry-breaking (nematicity) occurs intrinsically and generically or as a consequence of other orders is under debate. Here, we employ resonant x-ray scattering in stripe-ordered superconductors (La,M)2CuO4 to probe the relationship between electronic nematicity of the Cu 3d orbitals, structure of the (La,M)2O2 layers, and CDW order. We find distinct temperature dependences for the structure of the (La,M)2O2 layers and the electronic nematicity of the CuO2 planes, with only the latter being enhanced by the onset of CDW order. These results identify electronic nematicity as an order parameter that is distinct from a purely structural order parameter in underdoped striped cuprates.

PMID:
26912696
DOI:
10.1126/science.aad1824
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