Quasiparticle Scattering off Defects and Possible Bound States in Charge-Ordered ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$

Quasiparticle Scattering off Defects and Possible Bound States in Charge-Ordered ${YBa}_{2} {Cu}_{3} O_{y}$

R. Zhou, M. Hirata, T. Wu, I. Vinograd, H. Mayaffre, S. Krämer, M. Horvatić, C. Berthier, A. P. Reyes, P. L. Kuhns, R. Liang, W. N. Hardy, D. A. Bonn, and M.-H. Julien

Phys. Rev. Lett. 118, 017001 – Published 3 January 2017

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.

Received 19 July 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.017001

Physics Subject Headings (PhySH)

Charge density waves Dopants Impurities in superconductors Local density of states Superconducting phase transition

High-temperature superconductors

Nuclear magnetic resonance

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. Zhou¹, M. Hirata^1,*, T. Wu^1,†, I. Vinograd¹, H. Mayaffre¹, S. Krämer¹, M. Horvatić¹, C. Berthier¹, A. P. Reyes², P. L. Kuhns², R. Liang^3,4, W. N. Hardy^3,4, D. A. Bonn^3,4, and M.-H. Julien^5,‡

¹Laboratoire National des Champs Magnétiques Intenses, CNRS—Université Grenoble Alpes—UPS—INSA—EMFL, 38042 Grenoble, France
²National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
³Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
⁴Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada
⁵Laboratoire National des Champs Magnétiques Intenses, CNRS—Université Grenoble Alpes—EMFL, 38042 Grenoble, France

^*Present address: Institute for Materials Research (IMR), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.
^†Present address: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China (USTC), Anhui, Hefei 230026, People’s Republic of China.
^‡marc-henri.julien@lncmi.cnrs.fr

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Vol. 118, Iss. 1 — 6 January 2017

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Physical Review Letters

Quasiparticle Scattering off Defects and Possible Bound States in Charge-Ordered YBa2Cu3Oy

R. Zhou, M. Hirata, T. Wu, I. Vinograd, H. Mayaffre, S. Krämer, M. Horvatić, C. Berthier, A. P. Reyes, P. L. Kuhns, R. Liang, W. N. Hardy, D. A. Bonn, and M.-H. Julien

Phys. Rev. Lett. 118, 017001 – Published 3 January 2017

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Quasiparticle Scattering off Defects and Possible Bound States in Charge-Ordered ${YBa}_{2} {Cu}_{3} O_{y}$