APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014;
Denver, Colorado
Session L39: Invited Session: Interplay between Charge Order and Superconductivity in Cuprates
8:00 AM–11:00 AM,
Wednesday, March 5, 2014
Room: Mile High Ballroom 2A-3A
Sponsoring
Unit:
DCMP
Chair: Steven Kivelson, Stanford University
Abstract ID: BAPS.2014.MAR.L39.1
Abstract: L39.00001 : CDW in cuprates: insights from inelastic photon scattering
8:00 AM–8:36 AM
Preview Abstract
Abstract
Author:
Matthieu Le Tacon
(Max Planck Institute for Solid State Research)
In the search for the mechanism of HTSC, intense research has been focused
on the evolution of the spin excitation spectrum on doping from the AF
insulating to the superconducting state of the cuprates. We used RIXS to
show that~a large family of superconductors (YBa2Cu3O6$+$x) exhibits damped
spin~excitations with dispersions and spectral weights closely similar to
those of magnons in undoped cuprates [1,2]. In addition to magnetic
excitations, RIXS is also sensitive to charge. The greatly enhanced
sensitivity of the scattering signal to the valence electron system led us
to the discovery of a fluctuating charge density wave competing with the
superconducting order at low doping levels [3-5]. Using high resolution
inelastic x-ray scattering, we observe a central peak analogous to those
observed in conventional CDW systems and attributed to pining of CDW
nano-domains on defects. The study of low energy phonons with wavevectors
near the CDW ordering vector, also revealed extremely large
superconductivity induced lineshape renormalizations as well as anomalous
normal state broadening. This provides important insights regarding the
long-standing debate of the role of the electron-phonon interaction, a major
factor influencing the competition between collective instabilities in
correlated-electron materials [6]. Finally I will show how unambiguous
signatures of the CDW can be detected using more conventional inelastic
scattering of visible light (Raman scattering) [7].
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[1] M. Le Tacon\textit{ et al.}, Nat. Phys. \textbf{7}, 725 (2011).\\[0pt]
[2] M. Le Tacon\textit{ et al.}, Phys. Rev. B. \textbf{88}, R020501 (2013).\\[0pt]
[3] G. Ghiringhelli\textit{ et al.}, Science \textbf{337}, 821 (2012).\\[0pt]
[4] A. J. Achkar\textit{ et al.}, Phys. Rev. Lett. \textbf{109}, 167001 (2012).\\[0pt]
[5] S. Blanco-Canosa\textit{ et al.}, Phys. Rev. Lett. \textbf{110}, 187001 (2013).\\[0pt]
[6] M. Le Tacon\textit{ et al.}, Nat. Phys. \textit{in press} (2013).\\[0pt]
[7] M. Bakr\textit{ et al.}, submitted (2013).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.L39.1