Bulletin of the American Physical Society
2006 APS March Meeting
Monday–Friday, March 13–17, 2006; Baltimore, MD
Session Z38: High Tc Cuprates: ARPES |
Hide Abstracts |
Sponsoring Units: DCMP Chair: Michelle Johannes, Naval Research Laboratory Room: Baltimore Convention Center 341 |
Friday, March 17, 2006 11:15AM - 11:27AM |
Z38.00001: From Fermi Arcs to Nodal Metal: Scaling of the Pseudogap with Temperature and Doping Amit Kanigel, M.R. Noramn, M. Randeria, U. Chaterjee, A. Kaminski, H.M. Fretwell, S. Rosenkranz, M. Shi, T. Sato, T. Takahashi, Z.Z. Li, H. Raffy, K. Kadwaki, J.C. Campuzano The pseudogap phase in the cuprates is a most unusual state of matter$^{1-4}$: it is a metal, but its Fermi surface is broken up into disconnected segments known as Fermi arcs$^{5}$. Using angle resolved photoemission spectroscopy, we show that the anisotropy of the pseudogap in momentum space and the resulting arcs depend only on the ratio \textit{T/T*(x)}, where \textit{T*(x)} is the temperature below which the pseudogap first develops at a given hole doping, \textit{x}. In particular, the arcs, which extend at \textit{T*} to the hot spots where the antiferromagnetic zone boundary crosses the Fermi surface, collapse linearly with \textit{T/T*} and extrapolate to zero extent as \textit{T} 0. This suggests that the \textit{T} = 0 state is a nodal liquid, a strange metallic state whose gapless excitations are located only at points in momentum space, just as for a \textit{d-wave} superconductor. [Preview Abstract] |
Friday, March 17, 2006 11:27AM - 11:39AM |
Z38.00002: Pseudogap and Superconducting Gap in (La$_{2-x}$Sr$_x$)CuO$_4$ X.J. Zhou, T. Yoshida, W.L. Yang, Seiki Komiya, Yoichi Ando, T. Sasagawa, F. Zhou, W.X. Ti, J.W. Xiong, Z.X. Zhao, T. Kakeshita, H. Eisaki, S. Uchida, A. Fujimori, Z. Hussain, Z.-X. Shen We have carried out high resolution angle-resolved photoemission measurements on (La$_{2-x}$Sr$_x$)CuO$_4$ (LSCO) over the entire doping range (x=0$\sim$0.3). We will present doping-dependence and momentum-dependence of the pseudogap and superconducting gap in the LSCO system. [Preview Abstract] |
Friday, March 17, 2006 11:39AM - 11:51AM |
Z38.00003: ARPES Study of Nodal Quasiparticles of Bi$_{2}$Sr$_{1.6}$La$_{0.4}$CuO$_{6+\delta}$ Using Low-Energy Excitation Photons T. Kamo, K. Yamazaki, T. Yamasaki, H. Anzai, A. Ino, M. Arita, H. Namatame, M. Taniguichi, A. Fujimori, Z.-X. Shen, K. Fujita, S. Uchida Using low-energy synchrotron radiation ($h\nu = 7.75$ eV) as excitation photons, the quasiparticle-momentum resolution has been dramatically improved ($\Delta k \sim 0.01$\AA$^{-1}$) in the angle-resolved photoemission (ARPES) study of single-layer high-$T_{c}$ cuprate Bi$_{2}$Sr$_{1.6}$La$_{0.4}$CuO$_{6+\delta} $ (Bi2201). We report the new experimental result on the nodal quasiparticle dispersion and scattering rate of optimally doped Bi2201 (T$_{c}$ = 33 K) over an extended temperature range. Since only a single quasiparticle band is involved for the single-layer cuprate, the high-resolution quasiparticle images have provided us the direct information on fine quasiparticle structures. In comparison to the result on the bilayer cuprate Bi2212, we will discuss the character of the multiple excitation modes coupled with the electrons. [Preview Abstract] |
Friday, March 17, 2006 11:51AM - 12:03PM |
Z38.00004: Nodal Quasiparticle Life Time in High-Tc Cuprates Z.H. Pan, H.B. Yang, P. Richard, J.H. Ma, M. Neupane, Y.M. Xu, A. Shekharan, H. Ding, G. Gu, T. Valla, P.D. Johnson Angle-Resolved Photoemission Spectroscopy (ARPES) are used to study the temperature dependence of nodal quasiparticle life time of Bi$_2$Sr$_2$CaCu$_2$O$_8$ (Bi2212) with different doping levels. For optimally doped (OP) and overdoped (OD) samples, a sudden change is observed in the temperature dependence of the scattering rate at Tc, however this change is not obvious in the underdoped (UD) samples. [Preview Abstract] |
Friday, March 17, 2006 12:03PM - 12:15PM |
Z38.00005: A reexamination of the oxygen isotope effect in ARPES spectra of BSCCO Fraser Douglas, Z. Sun, D.S. Dessau, A.V. Fedorov, H. Eisaki, H. Iwasawa, Y. Aiura, T. Masui, S. Tajima High resolution angle-resolved photoemission spectroscopy (ARPES) has been utilized to further explore the effects of oxygen isotope substitution in Bi2212 and Bi2201 high temperature superconductors. First presented as evidence for the importance of phonons in the nodal dispersion of 2212, the use of several synchrotron beamlines with many different photon energies suggests an alternate explanation for the observed effect. [Preview Abstract] |
Friday, March 17, 2006 12:15PM - 12:27PM |
Z38.00006: Selective Observation of Bilayer-Split Nodal Quasiparticles in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ by ARPES Using Low-Energy Tunable Photons T. Yamasaki, T. Kamo, H. Anzai, A. Ino, M. Arita, H. Namatame, M. Taniguchi, A. Fujimori, Z.-X. Shen, M. Ishikado, S. Uchida Doubling the CuO$_{2}$ layer is considered to enhance the transition temperature of cuprate superconductors. However, since a recent breakthrough in angle-resolved-photoemission spectroscopy (ARPES) using low-energy excitation photons, it has been controversial whether the nodal bilayer splitting is resolvable or not. We have performed the photon-energy-dependent ARPES study of bilayer cuprate Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ using low-energy synchrotron radiation (h$\nu $ = 7-8 eV). While the bonding and antibonding band are consistently resolved by a constant splitting width of $\Delta k\cong 0.008\mbox{A}^{\mbox{-1}}$, the spectral weight drastically transfers between them with changing photon energy. The tunable photons enabled us to control the bonding-to-antibonding ratio from 0{\%} to 162{\%}. We will discuss the nodal quasiparticle properties using this bilayer-selective probe. [Preview Abstract] |
Friday, March 17, 2006 12:27PM - 12:39PM |
Z38.00007: Impurity-effect on the electronic structure in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ studied by angle-resolved photoemission spectroscopy Kensei Terashima, Hiroaki Matsui, Daisuke Hashimoto, Takafumi Sato, Takashi Takahashi, Hong Ding, Takashi Yamamoto, Kazuo Kadowaki We studied the impurity effect on the electronic structure near the Fermi level in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ by high-resolution angle-resolved photoemission spectroscopy to clarify the origin of dispersion kink in high-$T_{c}$ superconductors. We found that the dispersion kink at the off-nodal region is significantly suppressed by Zn or Ni impurity while that at the node is less affected. The impurity-induced change of the self-energy and its temperature dependence show a good correspondence to those of the magnetic excitation of $Q$ = ($\pi $, $\pi )$, suggesting that electrons are strongly coupled to the spin fluctuation at the antinodal region. [Preview Abstract] |
Friday, March 17, 2006 12:39PM - 12:51PM |
Z38.00008: Laser ARPES on the cuprate superconductor Bi2212 Jake Koralek, Fraser Douglas, Nick Plumb, Zhe Sun, Margaret Murnane, Henry Kapteyn, Steve Cundiff, Y. Aiura, K. Oka, H. Eisaki, Dan Dessau We use 6 eV photons from the fourth harmonic of a Ti:Sapphire laser to perform ARPES on the cuprate superconductor Bi2212. The very low photon energy improves momentum resolution and reduces extrinsic background, offering the clearest picture yet of the single electron spectral function. We will present detailed analysis of the temperature dependence of the nodal spectral lineshapes and compare the predictions of Fermi liquid theory and marginal Fermi liquid theory to what is seen in the data. We will also discuss recent laser ARPES results for overdoped and underdoped Bi2212. [Preview Abstract] |
Friday, March 17, 2006 12:51PM - 1:03PM |
Z38.00009: ARPES investigation of deeply underdoped BISCO 2212 K. Tanaka, W. S. Lee, D. H. Lu, T. Fujii, A. Fujimori, Z. Hussain, Z. X. Shen We present ARPES results from deeply underdoped BISCO 2212 with Tc ranging from 30 to 50 K. The improved sample quality with Y subsitution enables the detection of much sharper spectral features. We uncovered experimental evidence for two distinct energy gaps in these deeply underdoped samples. The theoretical implications of these findings will de discussed in conjunction with ARPES and RAMAN data. [Preview Abstract] |
Friday, March 17, 2006 1:03PM - 1:15PM |
Z38.00010: APRES study of the High temperature cuprates with high superconducting transition temperature (T$_{c}>$90K) Wei-Sheng Lee, Worawat Meevasana, Donghui Lu, Kyle Shen, Guichuan Yu, Xudong Zhao, Martin Greven, Zhi-Xun Shen, Wanli Yang, Akira Iyo, Hiroshi Eisaki The curprates with high superconducting transition temperature, nearly optimally doped HgBa$_{2}$CuO$_{4+\delta }$ system ( Hg1201, T$_{c}$=96K) and nearly optimally-doped TlBa2Ca$_{2}$Cu$_{3}$ O$_{8+\delta }$ ( Tl1223, T$_{c}$=120K), were studied by the Angle Resolved Photoemission Spectroscopy (ARPES). These materials provide us an opportunity to examine the universal properties of the cuprates and their material dependence trend. Although they are not easy to be cleaved, we managed to measure the band dispersions and the Fermi surfaces of these materials. Interestingly, in Hg1201 system, we found the existence of a quasi-particle peak along (0,0) to ($\pi $,$\pi )$ direction (nodal direction); whereas no structure was observed near the zone boundary. Contrarily, in Tl1223 system, a well-defined peak in EDCs was observed near the zone boundary; whereas no peak was observed in the nodal region. A comparison to other most studied cuprates will also be presented. [Preview Abstract] |
Friday, March 17, 2006 1:15PM - 1:27PM |
Z38.00011: Doping dependence study by ARPES on four layered cuprate superconductor Ba$_{2}$Ca$_{3}$Cu$_{4}$O$_{8}$(O$_{\delta }$F$_{1-\delta })_{2}$ Yulin Chen, Akira Iyo, Wanli Yang, Xingjiang Zhou, Donghui Lu, Hiroshi Eisaki, Thomas Devereaux, Zahid Hussain, Zhi-Xun Shen An interesting phenomenon in various families of cuprate superconductors is that with the increase of the number of CuO$_{2}$ layers (which are believed to be responsible for the superconducting phenomenon) within a unit cell of the crystal, the superconducting transition temperature (T$_{c})$ increases first with the layer number n when n$<$=3, then decreases when n$>$3 and reaches the maximum at n=3. To understand this phenomenon, we investigate a four layered cuprate family Ba$_{2}$Ca$_{3}$Cu$_{4}$O$_{8}$(O$_{\delta }$F$_{1-\delta })_{2}$ by Angular Resolved Photoemission Spectroscopy (ARPES). We find that the electronic band structure of this four layered system exhibits clear difference from the previously studied cuprate superconductors with less layers where layers are doped uniformly when n$<$=2. Our doing ($\delta )$ dependence study reveals the band structure, Fermi surface and superconducting gap evolution, with insights on important microscopic process. [Preview Abstract] |
Friday, March 17, 2006 1:27PM - 1:39PM |
Z38.00012: Dimensional crossover in the electronic structure of (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+\delta}$ T. Kondo, T. Takeuchi, H. Yang, H. Ding, A. Kaminski, J.C. Campuzano The hole-concentration $(p)$ dependence of the 3D energy- momentum ($\varepsilon -{\mbox{\boldmath $k$}}$) dispersion in Bi2201 was investigated by ARPES. We observe a significant $\varepsilon - k_z$ dispersion ($\sim$10 meV wide) around $(\pi,0)$ in a heavily overdoped sample ($T_c \le 0.5$ K). This $\varepsilon - k_z$ dispersion shrinks with decreasing $p$, and is not observed in lightly overdoped and optimally doped samples ($T_c = 21$ K and 35 K, respectively) indicating a crossover from a 3D to 2D electronic structure. [Preview Abstract] |
Friday, March 17, 2006 1:39PM - 1:51PM |
Z38.00013: Universal spectral weight transfer in high temperature superconductors Jeff Graf, G.-H. Gweon, K. McElroy, S.Y. Zhou, C. Jozwiak, E. Rotenberg, A. Bill, T. Sasagawa, H. Eisaki, S. Uchida, H. Takagi, D.-H. Lee, A. Lanzara High resolution angle resolved photoemission spectroscopy (ARPES) studies of the electronic structure of several cuprate families, over the entire phase diagram, from undoped to highly overdoped regime are reported. A detailed study of the one-electron dynamics as a function of momentum, temperature and doping is presented. A universal spectral weight transfer is observed for all systems and discussed in terms of a strong interplay between the electron-lattice and electron-electron interaction in these materials. [Preview Abstract] |
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