Bulletin of the American Physical Society
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 |
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Sponsoring Units: DCMP Chair: Steven Kivelson, Stanford University Room: Mile High Ballroom 2A-3A |
Wednesday, March 5, 2014 8:00AM - 8:36AM |
L39.00001: CDW in cuprates: insights from inelastic photon scattering Invited Speaker: Matthieu Le Tacon 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]. \\[4pt] [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). [Preview Abstract] |
Wednesday, March 5, 2014 8:36AM - 9:12AM |
L39.00002: Competition between superconductivity and charge order in YBCO via X-ray diffraction Invited Speaker: Johan Chang Recently, charge order has been probed by NMR [1], x-ray diffraction [2-5] and ultra sound [6] experiments in the cuprate system YBCO. In this talk, the most recent hard x-ray experiments [2-3] in high magnetic fields will be discussed. Consequences of competition between superconductivity and charge density wave order will be demonstrated. It will for example be shown how direct measurements of the upper critical field, H$_{\mathrm{c2}}$, reveal a 20-fold drop of the superconducting condensation energy as a result of this competition [7]. Connections to the Fermi-surface reconstruction detected by quantum oscillations will also be discussed.\\[4pt] [1] T. Wu \textit{et al.}, Nature 477, 191 (2011).\\[0pt] [2] E. Blackburn \textit{et al}., Physical Review Letters \textbf{110}, 137004 (2013).\\[0pt] [3] J. Chang \textit{et al}., Nature Physics \textbf{8}, 871 (2012).\\[0pt] [4] S. Blanco-Canosa \textit{et al}., Physical Review Letters \textbf{110}, 187001 (2013).\\[0pt] [5] G. Ghiringhelli \textit{et al}., Science \textbf{337}, 821 (2012).\\[0pt] [6] D. LeBoeuf \textit{et al}., Nature Physics \textbf{9}, 79 (2013).\\[0pt] [7] G. Grissonnanche \textit{et al}., arXiv:1303.3856 [Preview Abstract] |
Wednesday, March 5, 2014 9:12AM - 9:48AM |
L39.00003: Ubiquitous Interplay between Charge Ordering and High-Temperature Superconductivity in Cuprates Invited Speaker: Eduardo H. da Silva Neto In this talk, we will report on scanning tunneling microscopy (STM) and resonant elastic x-ray scattering measurements that are used to establish the formation of charge ordering in the high-temperature superconductor Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{\mathrm{8+x}}$. Depending on the hole concentration, the charge ordering in this system occurs with the same period as those in Y-based or La-based cuprates, but also displays the analogous competition with superconductivity. These results indicate the universality of charge organization competing with superconductivity across different families of cuprates. Our spectroscopic STM measurements demonstrate that this charge ordering leaves a distinct signature in its energy-dependence, which allows us to distinguish the charge order from impurity-induced quasiparticle interference, and to connect it to the physics of a doped Mott insulator [1]. Finally, we will comment on recent claims of electronic nematicity in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{\mathrm{8+x}}$ from STM studies. We show that anisotropic STM tip structures can induce energy-dependent features in spectroscopic maps on different correlated electron systems (cuprates and heavy-fermions) that can be misidentified as signatures of a nematic phase. Our findings show that such experimental features, which can be reproduced by a simple toy model calculation, can be understood as a generic tunneling interference phenomenon within an STM junction [2]. Work done in collaboration with: P. Aynajian, A. Frano, R. Comin, E. Schierle, E. Weschke, A. Gyenis, J. Wen, J. Schneeloch, Z. Xu, R. Baumbach, E. D. Bauer, J. Mydosh, S. Ono, G. Gu, M. Le Tacon, and A. Yazdani \\[4pt] [1] E.H. da Silva Neto et al. Science (2013).\\[0pt] [2] E.H. da Silva Neto et al. PRB 87, 161117(R) (2013).\\[0pt] [Preview Abstract] |
Wednesday, March 5, 2014 9:48AM - 10:24AM |
L39.00004: Charge order phase transition in an underdoped cuprate: a sound velocity study Invited Speaker: david le boeuf The recent discovery of charge order in underdoped YBCO has attracted a remarkable wealth of attention [T. Wu et al. Nature 477 191 (2011)]. Not only does it bring a natural explanation for the dramatic change in the Fermi surface observed with quantum oscillation, but recent theories also suggest it might be a fundamental ingredient for the formation of the pseudogap phase [K. B. Efetov et al. Nature Physics 9 442 (2013)]. Hence, the exact role of this charge order in the phase diagram of high-T$_{\mathrm{c}}$ cuprates must be elucidated. Here we use sound velocity, a simple yet very sensitive probe of phase transition, to study this charge order in underdoped YBCO [D. LeBoeuf et al. Nature Physics 9 79 (2013)]. I will show that sound velocity is a unique thermodynamic probe that allows to determine the (B,T) phase diagram of this charge order. This diagram contains information about key aspects of the interplay between charge order and superconductivity, such as competition. I will also show that using tensor properties of elastic constants one can elaborate about the symmetry of this charge order. [Preview Abstract] |
Wednesday, March 5, 2014 10:24AM - 11:00AM |
L39.00005: Electronic ordering and disorder effects in the pseudogap state of YBa$_{2}$Cu$_{3}$O$_{y}$ Invited Speaker: Marc-Henri Julien We report NMR measurements in the normal state of underdoped YBa$_{2}$Cu$_{3}$O$_{y}$. While unambiguous indication of charge-density-wave ordering is found in the pseudogap state, we interpret this as short range CDW order nucleated around native defects. We discuss the connections of this result to the initial evidence of CDW order in YBa$_{2}$Cu$_{3}$O$_{y}$ from NMR in high magnetic fields, to the more recent X-ray scattering data in the normal state as well as to a wider body of experimental results which have been considered to characterize the pseudogap state. [Preview Abstract] |
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