title: Quasiparticle Scattering off Defects and Possible Bound States in Charge-Ordered YBa_{2}Cu_{3}O_{y}.
abstract: We report the NMR observation of a skewed distribution of ^{17}O Knight shifts when a magnetic field quenches superconductivity and induces long-range charge-density-wave (CDW) order in YBa_{2}Cu_{3}O_{y}. This distribution is explained by an inhomogeneous pattern of the local density of states N(E_{F}) arising from quasiparticle scattering off, yet unidentified, defects in the CDW state. We argue that the effect is most likely related to the formation of quasiparticle bound states, as is known to occur, under specific circumstances, in some metals and superconductors (but not in the CDW state, in general, except for very few cases in 1D materials). These observations should provide insight into the microscopic nature of the CDW, especially regarding the reconstructed band structure and the sensitivity to disorder.
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: R
authors.initials: R
authors.lastname: Zhou
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Hirata
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: T
authors.initials: T
authors.lastname: Wu
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: I
authors.initials: I
authors.lastname: Vinograd
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: H
authors.initials: H
authors.lastname: Mayaffre
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Krämer
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Horvatić
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-UPS-INSA-EMFL, 38042 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Berthier
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Reyes
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: P L
authors.initials: PL
authors.lastname: Kuhns
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Liang
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada.
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada.
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-Université Grenoble Alpes-EMFL, 38042 Grenoble, France.
authors.forename: M-H
authors.initials: MH
authors.lastname: Julien