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Shutov DA, Bogdanov PV, Pleskunov PL. Destruction of organic dyes in aqueous solution by low-temperature plasma jet treatment. High Energy Chem 2016. [DOI: 10.1134/s0018143915050124] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yoshida T, Zhou XJ, Sasagawa T, Yang WL, Bogdanov PV, Lanzara A, Hussain Z, Mizokawa T, Fujimori A, Eisaki H, Shen ZX, Kakeshita T, Uchida S. Metallic behavior of lightly doped La2-xSrxCuO4 with a Fermi surface forming an arc. Phys Rev Lett 2003; 91:027001. [PMID: 12906502 DOI: 10.1103/physrevlett.91.027001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2002] [Indexed: 05/24/2023]
Abstract
Lightly doped La2-xSrxCuO4 in the so-called "insulating" spin-glass phase has been studied by angle-resolved photoemission spectroscopy. We have observed that a "quasiparticle" (QP) peak crosses the Fermi level in the node direction of the d-wave superconducting gap, forming an "arc" of Fermi surface, which explains the metallic behavior at high temperatures of the lightly doped materials. The QP spectral weight of the arc smoothly increases with hole doping, which we attribute to the n approximately x behavior of the carrier number in the underdoped and lightly doped regions.
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Affiliation(s)
- T Yoshida
- Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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Zhou XJ, Yoshida T, Lanzara A, Bogdanov PV, Kellar SA, Shen KM, Yang WL, Ronning F, Sasagawa T, Kakeshita T, Noda T, Eisaki H, Uchida S, Lin CT, Zhou F, Xiong JW, Ti WX, Zhao ZX, Fujimori A, Hussain Z, Shen ZX. High-temperature superconductors: Universal nodal Fermi velocity. Nature 2003; 423:398. [PMID: 12761537 DOI: 10.1038/423398a] [Citation(s) in RCA: 276] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- X J Zhou
- Department of Physics, Applied Physics and SSRL, Stanford University, Stanford, California 94305, USA.
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Yang WL, Brouet V, Zhou XJ, Choi HJ, Louie SG, Cohen ML, Kellar SA, Bogdanov PV, Lanzara A, Goldoni A, Parmigiani F, Hussain Z, Shen ZX. Band structure and Fermi surface of electron-doped C60 monolayers. Science 2003; 300:303-7. [PMID: 12690192 DOI: 10.1126/science.1082174] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
C60 fullerides are challenging systems because both the electron-phonon and electron-electron interactions are large on the energy scale of the expected narrow band width. We report angle-resolved photoemission data on the band dispersion for an alkali-doped C60 monolayer and a detailed comparison with theory. Compared to the maximum bare theoretical band width of 170 meV, the observed 100-meV dispersion is within the range of renormalization by electron-phonon coupling. This dispersion is only a fraction of the integrated peak width, revealing the importance of many-body effects. Additionally, measurements on the Fermi surface indicate the robustness of the Luttinger theorem even for materials with strong interactions.
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Affiliation(s)
- W L Yang
- Advanced Light Source (ALS), Materials Science Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA
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Bogdanov PV, Lanzara A, Zhou XJ, Yang WL, Eisaki H, Hussain Z, Shen ZX. Anomalous momentum dependence of the quasiparticle scattering rate in overdoped Bi2Sr2CaCu2O8. Phys Rev Lett 2002; 89:167002. [PMID: 12398747 DOI: 10.1103/physrevlett.89.167002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2002] [Indexed: 05/24/2023]
Abstract
The question of the anisotropy of the electron scattering in high temperature superconductors is investigated using high resolution angle-resolved photoemission data from Pb-doped Bi2Sr2CaCu2O8 (Bi2212) with suppressed superstructure. The scattering rate of low energy electrons along two bilayer-split pieces of the Fermi surface is measured (via the quasiparticle peak width), and no increase of scattering towards the antinode (pi,0) region is observed, contradicting the expectation from Q=(pi,pi) scattering. The results put a limit on the effects of Q=(pi,pi) scattering on the electronic structure of this overdoped superconductor with still very high T(c).
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Affiliation(s)
- P V Bogdanov
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, California 94305, USA
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Lanzara A, Bogdanov PV, Zhou XJ, Kellar SA, Feng DL, Lu ED, Yoshida T, Eisaki H, Fujimori A, Kishio K, Shimoyama JI, Noda T, Uchida S, Hussain Z, Shen ZX. Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors. Nature 2001; 412:510-4. [PMID: 11484045 DOI: 10.1038/35087518] [Citation(s) in RCA: 227] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Coupling between electrons and phonons (lattice vibrations) drives the formation of the electron pairs responsible for conventional superconductivity. The lack of direct evidence for electron-phonon coupling in the electron dynamics of the high-transition-temperature superconductors has driven an intensive search for an alternative mechanism. A coupling of an electron with a phonon would result in an abrupt change of its velocity and scattering rate near the phonon energy. Here we use angle-resolved photoemission spectroscopy to probe electron dynamics-velocity and scattering rate-for three different families of copper oxide superconductors. We see in all of these materials an abrupt change of electron velocity at 50-80 meV, which we cannot explain by any known process other than to invoke coupling with the phonons associated with the movement of the oxygen atoms. This suggests that electron-phonon coupling strongly influences the electron dynamics in the high-temperature superconductors, and must therefore be included in any microscopic theory of superconductivity.
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Affiliation(s)
- A Lanzara
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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Zhou XJ, Yoshida T, Kellar SA, Bogdanov PV, Lu ED, Lanzara A, Nakamura M, Noda T, Kakeshita T, Eisaki H, Uchida S, Fujimori A, Hussain Z, Shen ZX. Dual nature of the electronic structure of (La(2--x--y)Nd(y)Sr(x))CuO(4) and La(1.85)Sr(0.15)CuO(4). Phys Rev Lett 2001; 86:5578-5581. [PMID: 11415305 DOI: 10.1103/physrevlett.86.5578] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2000] [Indexed: 05/23/2023]
Abstract
High resolution angle-resolved photoemission measurements have been carried out on (La(1.4--x)-Nd(0.6)Sr(x))CuO(4), a model system with static one-dimensional (1D) charge ordering (stripe), and (La(1.85)-Sr(0.15))CuO(4), a high temperature superconductor (T(c) = 40 K) with possible dynamic stripes. In addition to the straight segments near ( pi,0) and ( 0,pi) antinodal regions, we have identified the existence of spectral weight along the [1,1] nodal direction in the electronic structure of both systems. This observation of nodal state, together with the straight segments near antinodal regions, reveals the dual nature of the electronic structure of stripes due to the competition of order and disorder.
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Affiliation(s)
- X J Zhou
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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Bogdanov PV, Lanzara A, Kellar SA, Zhou XJ, Lu ED, Zheng WJ, Gu G, Shimoyama J, Kishio K, Ikeda H, Yoshizaki R, Hussain Z, Shen ZX. Evidence for an energy scale for quasiparticle dispersion in Bi2Sr2CaCu2O8. Phys Rev Lett 2000; 85:2581-2584. [PMID: 10978112 DOI: 10.1103/physrevlett.85.2581] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/1999] [Indexed: 05/23/2023]
Abstract
Quasiparticle dispersion in Bi2Sr2CaCu2O8 is investigated with improved angular resolution as a function of temperature and doping. Unlike the linear dispersion predicted by the band calculation, the data show a sharp break in dispersion at 50+/-15 meV binding energy where the velocity changes by a factor of 2 or more. This change provides an energy scale in the quasiparticle self-energy. This break in dispersion is evident at and away from the d-wave node line, but the magnitude of the dispersion change decreases with temperature and with increasing doping.
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Affiliation(s)
- PV Bogdanov
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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