Bulletin of the American Physical Society
2009 APS March Meeting
Volume 54, Number 1
Monday–Friday, March 16–20, 2009; Pittsburgh, Pennsylvania
Session A33: Superconductivity: ARPES |
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Sponsoring Units: DCMP Chair: Barrett Wells, University of Connecticut Room: 403 |
Monday, March 16, 2009 8:00AM - 8:12AM |
A33.00001: Temperature dependent ARPES study of the pseudogap of Pb-Bi2201 Makoto Hashimoto, Ruihua He, Kiyohisa Tanaka, Jean-pierre Testaud, Worawat Meevasana, Rob Moore, Donghui Lu, Yoshiyuki Yoshida, Hiroshi Eisaki, Zahid Hussain, Zhi-Xun Shen The pseudogap phenomena in the high-Tc cuprates have been extensively studied because of possible intimate connection with the unknown mechanism of superconductivity. We have studied the ARPES spectra of optimally-doped Pb-Bi2201 (Tc = 34 K) at SSRL BL5-4, from the superconducting state (10 K) to the normal state above the pseudogap temperature (160 K). We have revealed how the band structure changes with the pseudogap opening, and found that the superconducting gap alone cannot explain the ARPES spectra in the antinodal region. Based on the results, in the presentation, we would like to discuss possible origins of the pseudogap. This work is supported by the DOE Office of Basic Energy Science, Division of Materials Science and Engineering. ARPES experiments were performed at the Stanford Synchrotron Radiation Laboratory (SSRL), which is operated by the Department of Energy Office of Basic Energy Science. [Preview Abstract] |
Monday, March 16, 2009 8:12AM - 8:24AM |
A33.00002: Pseudo-gap in electron doped cuprates: Spin fluctuation origin and close relation with superconducting gap Seung Ryong Park, D.J. Song, C.S. Leem, Chul Kim, S.K. Choi, Y.K. Kim, C. Kim, K.J. Choi, J.H. Kim, K.M. Song, Jung Hoon Han, Y. Yoshida, H. Eisaki A natural candidate for the cause of PG in electron doped cuprates could be spin fluctuation. However, there has not been any careful calculation based on the spin fluctuation model, at least to our best knowledge. Recently, entire dynamic spin susceptibility of electron doped cuprate was obtained by using inelastic neutron scattering. Therefore, one could use electron-spin coupling which is proportional to the dynamic spin susceptibility and calculate the spectral function based on the electron-spin fluctuation coupling model. In this presentation, we first show calculated ARPES spectral function based on electron-spin fluctuation coupling model with the magnetic susceptibility as the input. We could identify the origin of PG as electron-spin fluctuation from this simulation, and we also could extract a rough value for the electron-spin fluctuation coupling strength g in electron doped cuprates by comparison between experimental data and simulation results. [Preview Abstract] |
Monday, March 16, 2009 8:24AM - 8:36AM |
A33.00003: Temperature dependent ARPES study of the superconducting gap in overdoped Bi2212 H.-B. Yang, J.D. Rameau, G.D. Gu, P.D. Johnson High-resolution angle-resolved photoemission (ARPES) is used to probe the temperature dependence of the superconducting gap around the Fermi surface in overdoped Bi2212. Lucy-Richardson deconvolution is applied to reduce the error from experimental resolution. Normalizing by the Fermi function then allows the observation of the true gap in the spectral function. Numerical simulation is also used to compare the experimental results with theoretical models. We have investigated the temperature dependence of the gap around the nodal region and the anti-nodal region, with temperature going from the superconducting state into the normal state. [Preview Abstract] |
Monday, March 16, 2009 8:36AM - 8:48AM |
A33.00004: ABSTRACT WITHDRAWN |
Monday, March 16, 2009 8:48AM - 9:00AM |
A33.00005: ARPES study of YBa$_2$Cu$_3$O$_{7-\delta}$ from the over to the underdoped regime by in situ K evaporation G. Levy, David Fournier, M.A. Hossain, J.D.F. Mottershead, J.L. McCheyney, A. Bostwick, E. Rotenberg, W.N. Hardy, R. Liang, G.A. Sawatzky, I.S. Elfimov, D.A. Bonn, A. Damascelli Unravelling the nature of the electronic excitations in the underdoped regime of the Cuprates is a key element for understanding the fundamental mechanism behind HTSC. The YBCO phase diagram has been studied with photoelectron spectroscopy (ARPES) using a new in situ electron doping approach based on controlled potassium deposition [1] onto as-cleaved samples. All of the compounds studied ($\delta$=0,0.5,0.66) exhibit heavily over-doped nature with well defined LDA-like Fermi surfaces and evolve toward disconnected Fermi arcs in the underdoped regime. These results are consistent with previous ARPES measurement on the HTSCs and in contrast with the quantum oscillations observations [2]. \\[4pt] [1] M. A. Hossain et al., \textit{Nat. Phys.}, 4:527, 2008\\[0pt] [2] N. Doiron et al., \textit{Nature}, 447:565, 2007 [Preview Abstract] |
Monday, March 16, 2009 9:00AM - 9:12AM |
A33.00006: Quasiparticles in Bi-2212 I.M. Vishik, W.-S. Lee, K. Tanaka, B. Moritz, E.A. Nowadnick, T. Sasagawa, T. Fujii, T.P. Devereaux, Z.-X. Shen From ARPES measurements, much has been learned about the single-particle excitations of the high-Tc cuprate superconductors, and collective properties can be inferred from these experiments too. ~The gap in the spectrum below Tc is related to the superconducting gap, and the superfluid density, the other hallmark of superconductivity, has been demonstrated to correlate closely with the weight of the antinodal quasiparticle peak. ~The momentum, temperature, and doping dependence of quasiparticle lifetime yields information about scattering processes, which are related to ground state properties. ~In Bi-2212 quasiparticles are present on the entire Fermi surface over a wide doping range. ~We present ARPES studies of the quasiparticles in Bi-2212 as a function of doping, momentum, and temperature, and discuss connections to other experiments. [Preview Abstract] |
Monday, March 16, 2009 9:12AM - 9:24AM |
A33.00007: ARPES study on Tl-based Cuprates Wei-Sheng Lee, Kiyohisa Tanaka, Inna Vishik, Donghui Lu, Rob Moore, Hiroshi Eisaki, Akira Iyo, Thomas Devereaux, Zhu-Xun Shen Here we report the angle-resolved photoemission measurements on nearly optimally multi-layer Tl-based superconducting copper oxides, including Tl$_2$Ba$_2$CaCu$_2$O$_8$ (Tl-2212), TlBa$_2 $Ca$_2$Cu$_3$O$_9$ (Tl-1223), and a comparison to the data of single layer Tl$_2$Ba$_2$CuO$_6$ (Tl-2201). Consistent with other optimally-doped cuprates, a hole-like Fermi surface and sharp quasi-particle peak in the superconducting state is observed. The renormalization effect due to the coupling of bosonic modes is also observed, which exhibits intriguing materials dependence. Implications of the observed material dependent renormalization effect will also be discussed. [Preview Abstract] |
Monday, March 16, 2009 9:24AM - 9:36AM |
A33.00008: Anomalous behavior of the nodal scattering rate of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ near the Fermi energy Theodore Reber, Nick Plumb, John Douglas, Zhe Sun, Qiang Wang, Yoshihiro Aiura, Hiroshi Eisaki, Hideki Iwasawa, Michael Hermele, Daniel Dessau The scattering rate as determined by the width of a band is a direct measure of the imaginary part of a particle's self-energy. Though the dispersion of a band can also used to extract the particle's self energy, the scattering rate is superior, because the ambiguity due to determining the underlying bare band is not included. The excellent momentum and energy resolution of low photon energy ARPES allows us to study the scattering rate of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+ \delta }$ near the Fermi energy. Our studies show an anomalous feature that warrants continued study. [Preview Abstract] |
Monday, March 16, 2009 9:36AM - 9:48AM |
A33.00009: Novel feature in the nodal electron self-energy and strong temperature dependence of the Fermi velocity in the high temperature superconductor Bi2212 N.C. Plumb, T.J. Reber, J.D. Koralek, Z. Sun, J.F. Douglas, Y. Aiura, K. Oka, H. Eisaki, D.S. Dessau Using low-photon energy angle-resolved photoemission (ARPES), we study the low-energy dispersion along the superconducting node in Bi2212 as a function of temperature. Less than 10 meV below the Fermi energy, the high-resolution data reveals a novel ``kink''-like feature in the real part of the electron self-energy. The kink is strongest below the superconducting critical temperature and appears to vanish as the temperature is raised. A corollary of this finding is that the Fermi velocity, as measured over this small energy range, varies rapidly with temperature -- increasing by approximately 35{\%} from 50 to 200 K. This is in contrast to the slope of the dispersion at only slightly deeper energy, which changes little by comparison and whose behavior is ostensibly dominated by the well-known 70-meV kink. We discuss some possible physical origins of the new low-energy feature, including the possibility that it may arise from bosonic mode couplings and/or nonanalytic corrections to Fermi liquid theory in 2D. [Preview Abstract] |
Monday, March 16, 2009 9:48AM - 10:00AM |
A33.00010: ARPES investigation of two leg ladder compounds Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$ Gey-Hong Gweon, Takao Sasagawa, Takami Tohyama, Matthew Brunner, James Hinton, Jacob Stanley The so-called ``two leg ladder compounds'' Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$ are interesting since it is well accepted that they form a resonating valence bond state. The crystal structure of two leg ladder compounds consists of one-dimensional motifs (ladders and chains), and it is within the ladders that the resonating valence bond state arises. As $x$ is varied, these compounds go through a metal-insulator transition, and become a superconductor, albeit under pressure. So far, a high resolution ARPES study shedding light on the near-Fermi-level electronic structure of these interesting compounds has been missing. Here, we report our ARPES results, providing the first view of the near-Fermi-level quasi-one-dimensional electronic structure arising from the ladders. We discuss line shape features that are indicative of strong electron correlations. [Preview Abstract] |
Monday, March 16, 2009 10:00AM - 10:12AM |
A33.00011: ARPES matrix element and the waterfall effect in the cuprates. Susmita Basak, Tanmoy Das, Jouko Nieminen, Matti Lindroos, Hsin Lin, Robert Markiewicz, Arun Bansil The high-energy kink (HEK) or the 'waterfall' effect as seen in angle-resolved photoemission spectra (ARPES) in the cuprates has the potential of revealing important information about the dressing of quasiparticles by electronic excitations [1,2,3]. However, recently it has been suggested that matrix element effects radically modify the experimental spectra in $\rm{Bi_2Sr_2CaCu_2O_8}$ (Bi2212), and it has been questioned whether the HEK exists [4]. Here we discuss how the interplay between the matrix element and self-energy effects shapes the ARPES spectra. Both the ARPES matrix element and the self-energy are found to be necessary for understanding the experimental spectra. Work supported in part by the USDOE. [1] R. S. Markiewicz {\it et al.}, Phys. Rev. B {\bf{76}}, 174514 (2007). [2] A. Macridin {\it et al.},Phys. Rev. Lett. {\bf 99}, 237001 (2007). [3] Tanmoy Das {\it et al.}, cond-mat:0807.4257. [4] D.S. Inosov {\it et al.}, Phys. Rev. Lett. {\bf 99}, 237002 (2007). [Preview Abstract] |
Monday, March 16, 2009 10:12AM - 10:24AM |
A33.00012: ABSTRACT WITHDRAWN |
Monday, March 16, 2009 10:24AM - 10:36AM |
A33.00013: LASER ARPES studies on Sr$_{2}$RuO$_{4}$ Chul Kim, Seung-Ryong Park, C. S. Leem, D. J. Song, Y. K. Kim, S. K. Choi, W. S. Jung, Y. Y. Ko, C. Kim LASER ARPES was performed on Sr$_{2}$RuO$_{4}$. With advance of LASER ARPES, we could perform bulk sensitive ARPES with 1meV energy resolution. With these advantages, intensive studies on Sr$_{2}$RuO$_{4}$ enlightened us more knowledge on layered structures. [Preview Abstract] |
Monday, March 16, 2009 10:36AM - 10:48AM |
A33.00014: Fermiological interpretation for collective spin and charge orderings in underdoped La-based cuprates by ARPES Ruihua He, Kiyohisa Tanaka, Sung-Kwan Mo, Hong Yao, Makoto Hashimoto, Erez Berg, Takao Sasagawa, Tadashi Adachi, Masaki Fujita, Teppei Yoshida, Norman Mannella, Worawat Meevasana, Yoji Koike, Kazuyoshi Yamada, Atsushi Fujimori, Steve Kivelson, Zahid Hussain, Zhi-Xun Shen By using ARPES interpretation for the origin of the collective spin and charge orderings in underdoped La-based cuprate superconductors is carefully examined. A Fermi surface nesting wave vector is identified which closely matches the collective ordering wave vector observed by neutron scattering for doping around 1/8. The pseudogap state is found to be essential for the development of such nesting instability of the electronic system toward density wave formation. A systematic doping dependence study will be presented that allows further insights into this issue. [Preview Abstract] |
Monday, March 16, 2009 10:48AM - 11:00AM |
A33.00015: Mott gap collapse in the cuprates -- apparent or real? R. S. Markiewicz, Tanmoy Das, A. Bansil We have recently introduced a model self-energy for the cuprates, which includes an antiferromagnetic (AFM) transition dressed by spin and charge fluctuations.[1] This model correctly reproduces many `strong coupling' features in the angle-resolved photoemission (ARPES) and optical spectra, including the waterfall effect and the doping dependence of the optical Mott gap. Here we discuss a dichotomy between Slater and Mott physics in the cuprates, with a Slater-like AFM gap collapse with doping in the coherent bands while the Mott-like gap persists in the incoherent bands. By analyzing the spectral weights, we show that there is an anomalous spectral weight transfer which is rather large to be consistent with strong coupling physics, but which is reasonably described by our intermediate coupling model. Work supported in part by the USDOE. [1] Tanmoy Das, R. S. Markiewicz, and A. Bansil, arXiv:0807.4257. [Preview Abstract] |
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