Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session M35: HTSC: Mainly X-ray Probes and Related Theory |
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Sponsoring Units: DMP Chair: Michael Sentef, Stanford University Room: 343 |
Wednesday, March 20, 2013 8:00AM - 8:12AM |
M35.00001: ABSTRACT WITHDRAWN |
Wednesday, March 20, 2013 8:12AM - 8:24AM |
M35.00002: Surface-enhanced charge-density-wave instability in underdoped Bi2201 J.A. Rosen, R. Comin, G. Levy, G. Sawatzky, A. Damascelli, G. Blake, T.T.M. Palstra, B. Keimer, L. Petaccia, Y. Yoshida, H. Eisaki Neutron and x-ray scattering experiments have provided mounting evidence for spin and charge ordering phenomena in underdoped cuprates, ranging from stripe correlations in Nd-LSCO to the recently discovered charge-density-waves in YBCO. Here we show that these electron-lattice instabilities also exhibit a previously unrecognized bulk-surface dichotomy. Surface-sensitive electronic and structural probes uncover a temperature-dependent evolution of the CuO$_2$ plane band dispersion and apparent Fermi pockets in underdoped Bi2201, which is associated with a strong temperature dependence of the incommensurate superstructure periodicity below 130 K. In stark contrast, the structural modulation revealed by bulk-sensitive probes is temperature independent. These findings point to a surface-enhanced incipient charge-density-wave instability, driven by Fermi surface nesting. This discovery is of critical importance in the interpretation of single-particle spectroscopy data and establishes the surface of cuprates as a rich playground for the study of electronically soft phases. [Preview Abstract] |
Wednesday, March 20, 2013 8:24AM - 8:36AM |
M35.00003: Distinct Charge Orders in the Planes and Chains of Ortho-III-Ordered YBa2Cu3O6 identified by Resonant elas- tic x-ray scattering D.G. Hawthorn, A.J. Achkar, R. Sutarto, X. Mao, F. He, A. Frano, S. Blanco-Canosa, M. Le Tacon, G. Ghiringhelli, L. Braicovich, M. Minola, M. Moretti Sala, C. Mazzoli, Ruixing Liang, D.A. Bonn, W.N. Hardy, B. Keimer, G.A. Sawatzky Recently, charge density wave order with {\bf \it Q} = [0.3 0 $L$] and [0 0.3 $L$] was detected for the first time in underdoped YBCO using resonant soft x-ray scattering at the Cu $L_3$ absorption edge. Here, we explore the energy and polarization dependence of the resonant scattering intensity in detwinned YBa$_2$Cu$_3$O$_{6.75}$ with ortho-III oxygen ordering in the chain layer. We show that the ortho-III order results in a commensurate peak at $H$ = 0.33 whose energy and polarization dependence agrees with expectations for oxygen ordering in the chains. The [0.3 0 $L$] and [0 0.3 $L$] peaks, which result from a modulation of Cu 3$d_{x^2-y^2}$ states in the CuO$_2$ planes, are shown to be distinct and seemingly unrelated to the structure of the chain layer. Moreover, the energy dependence of the [0.3 0 $L$] and [0 0.3 $L$] scattering intensity is found to result from a spatial modulation of the energies of the Cu 2$p$ to 3$d_{x^2-y^2}$ transition, similar to stripe-ordered 214 cuprates. [Preview Abstract] |
Wednesday, March 20, 2013 8:36AM - 8:48AM |
M35.00004: Microscopic theory of resonant soft x-ray scattering David Benjamin, Dmitry Abanin, Peter Abbamonte, Eugene Demler We have developed a microscopic theory of resonant soft x-ray scattering (RSXS) that accounts for the delocalized character of valence electrons as well as excitonic and orthogonality catastrophe effects due to the core hole. We have derived a convenient and intuitive exact formula for RSXS intensities. Applying our formalism to the underdoped cuprates, we find that dynamic nesting in the band structure provides the most natural explanation for the two peaks observed in RSXS spectra. Our results give evidence for the existence of reasonably well-defined quasiparticles as far as 1.5 eV above the Fermi level in underdoped cuprates, and establish RSXS as a bulk-sensitive probe of electron quasiparticles. [Preview Abstract] |
Wednesday, March 20, 2013 8:48AM - 9:00AM |
M35.00005: Determinant Quantum Monte Carlo Study of the Enhancement of d-wave Pairing by Charge Inhomogeneity Rubem Mondaini, Tao Ying, Thereza Paiva, Richard T. Scalettar Striped phases, in which spin, charge, and pairing correlations vary inhomogeneously in the CuO$_2$ planes, are a known experimental feature of cuprate superconductors, and are also found in a variety of numerical treatments of the two dimensional Hubbard Hamiltonian. In this paper we use determinant Quantum Monte Carlo to show that if a stripe density pattern is imposed on the model, the $d$-wave pairing vertex is significantly enhanced. We attribute this enhancement to an increase in antiferromagnetic order which is caused by the appearance of more nearly half-filled regions when the doped holes are confined to the stripes. We also observe an enhanced $d$-wave pair correlation inside stripes reaching its maximum value when the $\pi$-phase shift in the magnetic order takes place. \\ Reference: Rubem Mondaini and Tao Ying and Thereza Paiva and Richard T. Scalettar, Phys. Rev. B 86, 184506 (2012). [Preview Abstract] |
Wednesday, March 20, 2013 9:00AM - 9:12AM |
M35.00006: Energetics of superconductivity in the two dimensional Hubbard model Emanuel Gull, Andrew J. Millis The energetics of the interplay between superconductivity and the pseudogap in high temperature superconductivity is examined using the eight-site dynamical cluster approximation to the two dimensional Hubbard model. Two regimes of superconductivity are found: a weak coupling/large doping regime in which the onset of superconductivity causes a reduction in potential energy and an increase in kinetic energy, and a strong coupling regime in which superconductivity is associated with an increase in potential energy and decrease in kinetic energy. The crossover between the two regimes is found to coincide with the boundary of the normal state pseudogap, providing further evidence of the unconventional nature of superconductivity in the pseudogap regime. However the absence, in the strongly correlated but non-superconducting state, of discernibly nonlinear response to an applied pairing field, suggests that resonating valence bond physics is not the origin of the kinetic-energy driven superconductivity. [Preview Abstract] |
Wednesday, March 20, 2013 9:12AM - 9:24AM |
M35.00007: Superconconductivity and antiferromagnetism for the one-band Hubbard model of the cuprates including inter-plane hopping Simon Verret, Chuck-Hou Yee, David Senechal, A.-M.S. Tremblay While the overall features of the zero-temperature phase diagram of the cuprates are well described by the two-dimensional Hubbard model, the quest for a quantitative theory must include three-dimensional effects to account for differences between materials. To this end, using first-principles calculations [1,2], we obtain realistic parameters for the one-band Hubbard model that include hopping between planes. We then solve the resulting Hubbard Hamiltonian using the Variational Cluster Approximation [3] and Cellular-Dynamical Mean-Field Theory with an exact diagonalization impurity solver [4,5]. For single-layer materials, the effect of the inter-plane hopping is not sufficient to explain all the differences between the experimental phase diagrams for the various materials. We suggest other avenues of investigation. [1] Weber et al., Europhysics Lett. 100 37001 (2012) [2] Souza et al, Physical Review B 65 035109 (2001) [3] S\'{e}n\'{e}chal et al, Phys. Rev. Lett. 94 156404 (2005) [4] Caffarel and Krauth, Phys. Rev. Lett.72 1545-1548 (1994) [5] S\'{e}n\'{e}chal, Theoretical methods for Strongly Correlated Systems, eds: Mancini, Avella (Springer series, 2011) [Preview Abstract] |
Wednesday, March 20, 2013 9:24AM - 9:36AM |
M35.00008: Spectral properties near the Mott transition in the two-dimensional Hubbard model Masanori Kohno Single-particle excitations near the Mott transition in the two-dimensional (2D) Hubbard model are investigated by using cluster perturbation theory. The Mott transition is characterized by the loss of the spectral weight from the dispersing mode that leads continuously to the spin-wave excitation of the Mott insulator [1,2]. The origins of the dominant modes of the 2D Hubbard model near the Mott transition can be traced back to those of the one-dimensional Hubbard model. Various anomalous spectral features observed in cuprate high-temperature superconductors, such as the pseudogap, Fermi arc, flat band, doping-induced states, hole pockets, and spinon-like and holon-like branches, as well as giant kink and waterfall in the dispersion relation, are explained in a unified manner as properties near the Mott transition in a 2D system [1].\\[4pt] [1] M. Kohno, Phys. Rev. Lett. 108, 076401 (2012).\\[0pt] [2] M. Kohno, Phys. Rev. Lett. 105, 106402 (2010). [Preview Abstract] |
Wednesday, March 20, 2013 9:36AM - 9:48AM |
M35.00009: A RIXS study on Spin and Charge Excitations in Electron-Doped Cuprates, NCCO Wei-Sheng Lee, James J. Lee, Wojciech Tabis, Martin Greven, Thomas. P. Devereaux, Thorsten Schmit, Z.X. Shen The phase diagram of the high-Tc cuprates is known to exhibit intriguing asymmetric doping evolution between the hole and electron-doping. ARPES and inelastic neutron scattering experiments have been extensively applied to study cuprates on both sides of the phase diagram, revealing a distinct Fermi surface evolution between the hole- and electron-doped cuprates, and the properties of low energy spin excitations. In this presentation, I will report high energy spin excitations and charge excitations of electron-deoped cuprates, Nd2-xCexCuO4, measured via resonant inelastic x-ray scattering (RIXS) at the Cu L-edge. The doping evolution of these excitations and their differences with those of the hole-doped cuprates will be discussed. [Preview Abstract] |
Wednesday, March 20, 2013 9:48AM - 10:00AM |
M35.00010: Inelastic X-ray scattering measurement of electronic order in Bi2212 Craig Bonnoit, Dillong Gardner, Ayman Said, Genda Gu, John Tranquada, Young Lee We present inelastic x-ray scattering measurements on superconducting Bi2212, showing evidence for a phonon anomaly associated with an underlying electronic density-wave state. We observe an broadening of the longitudinal acoustic phonon at a wavevector comparable to the antinodal nesting wavevector, near (1/4,1/4,0) in orthorhombic notation. An observed asymmetry between phonon creation and annihilation processes indicates breaking of time reversal and inversion symmetry as temperature is lowered. These measurements are consistent with prior work on single layer Bi2201, indicating universality of these features in the family of Bi-based high-Tc materials. [Preview Abstract] |
Wednesday, March 20, 2013 10:00AM - 10:12AM |
M35.00011: Temperature and doping dependence of x-ray absorption spectral weight in YBa$_2$Cu$_3$O$_y$ Jiunn-Yuan Lin, Chung-Yu Mou, J.M. Chen The comprehensive study of the temperature dependent x-ray absorption spectroscopy (XAS) could be attributed to a dynamical spectral weight $\alpha$ in YBa$_2$Cu$_3$O$_y$ (YBCO). Large spectral weight changes with the temperature for both the Upper Hubbard band and the Zhang-Rice band due to dynamics of holes are experimentally found in the underdoped regime. These spectral weight changes become larger when the doping level $p$ goes deeper into the underdoped regime, but quickly vanishes as $p$ goes to the undoped limit. Our results clearly indicate that the pseudogap is related to the double occupancy and originates from bands in higher energies. [Preview Abstract] |
Wednesday, March 20, 2013 10:12AM - 10:24AM |
M35.00012: Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors Cheng-Chien Chen, Michael Sentef, Yvonne Kung, Chunjing Jia, Ronny Thomale, Brian Moritz, Arno Kampf, Thomas Devereaux We study oxygen K-edge x-ray absorption spectroscopy (XAS) and investigate the validity of the Zhang-Rice Singlet (ZRS) picture in overdosed cuprate superconductors. Using large-scale exact diagonalization of the three-orbital Hubbard model, we observe the effect of strong correlations manifesting in a dynamical spectral weight transfer from the upper Hubbard band to the ZRS band. The quantitative agreement between theory and experiment highlights an additional spectral weight reshuffling due to core-hole interaction. Our results confirm the important correlated nature of the cuprates and elucidate the changing orbital character of the low-energy quasi-particles, but also demonstrate the continued relevance of the ZRS even in the overdosed region. [Preview Abstract] |
Wednesday, March 20, 2013 10:24AM - 10:36AM |
M35.00013: Temperature and doping dependence of spectral features in determinant quantum Monte Carlo studies of the three-orbital Hubbard model of cuprate superconductors Y.F. Kung, E.A. Nowadnick, S. Johnston, C.-C. Chen, B. Moritz, T.P. Devereaux Studying temperature and doping trends in strongly correlated materials is integral to understanding how their properties emerge and develop, and possibly can be tuned. To this end, determinant quantum Monte Carlo simulations are used to investigate spectral features in the three-orbital Hubbard model as applied to the cuprate superconductors. Spectral functions relevant to photoemission measurements are calculated and various spectral features, such as the indirect charge-transfer gap and Zhang-Rice singlet band, are shown to vary with doping and temperature. These orbitally resolved calculations help shed light on the applicability of the Zhang-Rice singlet picture at high hole doping levels. The density of states is also compared and contrasted with exact diagonalization studies as well as recent x-ray absorption spectroscopy measurements. [Preview Abstract] |
Wednesday, March 20, 2013 10:36AM - 10:48AM |
M35.00014: Covalent magnetic form factor and neutron scattering in cuprates Igor Zaliznyak, Zhijun Xu, Genda Gu, Andrei Savici, Garrett Granroth, Matthew Stone We investigate the effect of covalent hybridization on magnetic excitations measured by the inelastic neutron scattering (INS) in the 1D cuprate Sr$_2$CuO$_3$ and the 2D La$_2$CuO$_4$. It has been previously shown that strong hybridization of Cu 3d states with O p states leads to the dramatic modification of the measured INS intensity, which is strongly suppressed, by factor 2.5-3, compared to the ionic spin model [1]. The result was obtained by comparing the measured intensity in a chain cuprate Sr$_2$CuO$_3$ with the dynamical spin structure factor predicted by the exact theory [2] of the model spin-1/2 Heisenberg Hamiltonian, which is typically used for cuprates. In the present follow-up study we extend these measurements so as to probe directly the wave vector dependence of the magnetic form factor, which is the Fourier transform of the magnetic electron's density, both in Sr$_2$CuO$_3$, and in the LSCO parent material, the two-dimensional La$_2$CuO$_4$. Our results yield a model-independent measurement of the magnetic form factor and provide an explanation for the suppressed magnetic intensity in La$_2$CuO$_4$ and other cuprates.\\[4pt] [1] A. Walters, \emph{et. al}, Nature Physics {\bf 5}, 867 (2009).\\[0pt] [2] J.-S. Caux, R. Hagemans, J. Stat. Mech., {\bf P12013} (2006) [Preview Abstract] |
Wednesday, March 20, 2013 10:48AM - 11:00AM |
M35.00015: Angle and frequency dependence of the self-energy induced by boson fluctuation spectrum Seung Hwan Hong, Han-Yong Choi We study the effects of the electron-boson coupling on the angle and frequency dependence of the self-energy. The spin susceptibility spectrum of the LSCO in superconducting state measured by the inelastic neutron scattering experiments has commensurate and incommensurate peaks. The energy scale of the self-energy induced by the commensurate peak is independent on the angle because of a small correlation length. On the other hand, that induced by the incommensurate peak depends on the angle because it has a large correlation length. The Eliashberg calculation using the measure spin fluctuation spectrum yields that the energy scale of the self-energy is larger along the anti-nodal direction than along the nodal direction. This result, however, is not consistent with the self-energy extracted from the ARPES analysis. Then we also considered the self-energy induced by Varma's loop current fluctuations. The results will be presented in comparison with the ARPES experiments. [Preview Abstract] |
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