Doubling of the Bands in Overdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>

Chuang, Yi‐De; Gromko, A. D.; Fedorov, A. V.; Aiura, Y.; Oka, Kunihiko; Ando, Yoichi; Eisaki, H.; Uchida, S.; Dessau, D. S.

doi:10.1103/physrevlett.87.117002

Cited by 154 publications

(148 citation statements)

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“…In particular, the data from both Pbdoped Bi2212 and Pb-doped Bi2201, where the superstructure effect near (π, 0) is minimized, gives confidence to the conclusion. The conversion from velocity ratio to the coupling constant λ away from the (π, π) direction requires the correction due to band structure effect including bilayer-splitting that increases away from (π,π) direction 15, 16 , but the conclusion that the coupling is not very anisotropic remains true.…”

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confidence: 99%

Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Lanzara

Bogdanov

Zhou

et al. 2001

Nature

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Coupling between electrons and phonons (lattice vibrations) drives the formation of the electron pairs responsible for conventional superconductivity 1 . 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 dynamicsvelocity 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 50-80meV, 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. We investigated the electronic quasiparticle dispersions in three different families of hole-doped cuprates, Bi 2 Sr 2 CaCu 2 O 8 (Bi2212) and Pb doped Pb-Bi2212, Pb-doped Bi 2 Sr 2 CuO 6 (Pb-Bi2201) and La 2-x Sr x CuO 4 (LSCO). Except for the Bi2201 (overdoped, T c =7K) data and that in Fig. 3b, recorded at the beam-line 5.4 of the Stanford Synchrotron Radiation Laboratory (SSRL), all the data were recorded at the Advanced Light Source (ALS), as detailed elsewhere 2 . The top panels of figure 1 report the momentum distribution curve (MDC) derived dispersions along the (0, 0)-(π, π) direction for LSCO (panel a) and Bi2212 (panel b) superconducting state and for Pb-Bi2201 normal state (panel c) vs the rescaled momentum, k ' , defined by normalizing to one the momentum k relative to the Fermi momentum k F , (k-k F ), at the binding energy E=170meV. A "kink" in the dispersion around 50-80meV, highlighted by thick arrows in the figure, is the many-body effect of

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confidence: 99%

Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Lanzara

Bogdanov

Zhou

et al. 2001

Nature

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115

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“…This result, being quite surprising not long ago, can be well understood now in terms of the bilayer splitting of the CuO band. 20,21 Before going further, we note that such a shift is hard to explain by the assumption that the doping level at the surface is lower than in the bulk. If this were the case ͑for example, by loss of oxygen at the surface͒, such a deviation should be strongly dependent on the oxygen loading procedure, affecting the OD samples more strongly than the UD, which is clearly not the case.…”

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confidence: 99%

Doping dependence of the Fermi surface in(Bi,Pb)2Sr
Kordyuk
¹
,
Борисенко
²
,
Golden
³

et al. 2002
Phys. Rev. B
93
6
94
1
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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A detailed and systematic angle-resolved photoemission spectroscopy investigation of the doping dependence of the normal-state Fermi surface ͑FS͒ of modulation-free ͑Pb,Bi͒-2212 is presented. The FS does not change in topology away from hole like at any stage. The FS area does not follow the usual curve describing T c vs x for the hole-doped cuprates, but is downshifted in doping by ca. 0.05 holes per Cu site, indicating the consequences of a significant bilayer splitting of the FS across the whole doping range. The strong k dependence of the FS width is shown to be doping independent. The relative strength of the shadow FS has a doping dependence mirroring that of T c .

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“…In this paper, we present experimental results on the optimally doped cuprate Bi 2 Sr 2 CaCu 2 O 8+δ (BSCCO 2212, T C ≈ 95 K), measured by spin-resolved photoemission while maintaining the full energy and momentum resolution of ARPES. Cuprate superconductors are representative systems for the study of electron correlations and have been probed extensively by ARPES [24][25][26][27][28][29]. Furthermore, it has already been shown in a previous work [30] that spin-resolved angle-integrated resonant photoemission can help improve the description of their electronic structure by determining, for instance, the Zhang-Rice singlet character of the relevant low-energy states in BSCCO.…”

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confidence: 99%

“…1(b) with its common labeling, encloses the Brillouin zone corners. It presents a splitting into bonding and antibonding states due to the presence of a CuO 2 bilayer within the unit cell [24] and is affected by umklapp bands due to diffraction by the Bi atoms at the cleaved surface [34]. All momentum distribution curves (MDCs) shown in Figs.…”

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confidence: 99%

Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+δ

et al. 2017

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Photoelectrons produced from the excitation of spin-degenerate states in solids can have a sizable spin polarization, which is related to the phase of interfering channels in the photoemission matrix elements. Such spin polarization can be measured by spin-resolved photoemission spectroscopy to gain information about the transitions and the Wigner time delay of the process. Incorporating strongly correlated electron systems into this paradigm could yield a novel means of extracting phase information crucial to understanding the mechanism of their emergent behavior. In this work, we present, as a case study, experimental measurements of the cuprate superconductor Bi 2 Sr 2 CaCu 2 O 8+δ by spin-resolved photoemission while maintaining full angular and energy resolution. A spin polarization of at least 10% is observed, which is related to the phase of the photoelectron wave function. DOI: 10.1103/PhysRevB.95.245125 The electronic properties of crystals are best understood when information on their band structure can be obtained. Angle-resolved photoemission spectroscopy (ARPES) provides a direct means of reconstructing the band structure by measuring the energies and momenta of electrons photoexcited from a solid [1]. Spin-and angle-resolved photoemission spectroscopy (SARPES), in addition, measures the spin polarization P of the photoelectron beam as a function of emission angle and kinetic energy. This can show a net polarization if the initial state is polarized as, for example, in ferromagnets [2,3] or spin-momentum-locked systems, such as Rashba-like materials [4][5][6] and topological insulators [7][8][9][10], but also as a result of the photoemission process as a whole [11]. If the incident light is circularly polarized, i.e., it carries angular momentum, the spin polarization of the photoelectron beam from solid-state targets can, in several different circumstances, be interpreted as a result of the selection rules for the considered transitions along the lines of the atomic Fano effect [12][13][14][15][16].Also, when the incident light is linearly polarized or unpolarized, i.e., it does not transfer a net angular momentum, the photoelectron beam can still present a sizable P. The origin of this effect lies in the symmetry reduction of angledependent photoemission and in the interference of different photoemission channels. The size of P is related to the phase shift of the complex matrix elements describing the transitions under consideration [17][18][19]. One can, therefore, access the phase information by measuring the spin polarization of the photoelectrons. In particular, a novel application of SARPES is the estimate of the Eisenbud-Wigner-Smith (EWS) time delay [20] τ EWS of photoemission, defined as the derivative of the phase shift with respect to the photoelectron kinetic energy, obtained from the measured P, as shown in Ref. [19] for the model system Cu(111). By expressing the spin polarization as a function of the radial parts and phase shifts of the matrix elements, along the lines of the ato...

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Doubling of the Bands in OverdopedBi2Sr2CaCu2

Cited by 154 publications

References 13 publications

Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Doping dependence of the Fermi surface in(Bi,Pb)2Sr
Kordyuk
¹
,
Борисенко
²
,
Golden
³

et al. 2002
Phys. Rev. B
93
6
94
1
View full text Add to dashboard Cite

Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+δ

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Doubling of the Bands in OverdopedBi2Sr2CaCu2

Cited by 154 publications

References 13 publications

Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Doping dependence of the Fermi surface in(Bi,Pb)2SrKordyuk1, Борисенко2, Golden3 et al. 2002Phys. Rev. B936941View full textAdd to dashboardCite

Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+δ

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Resources

About

Doping dependence of the Fermi surface in(Bi,Pb)2Sr
Kordyuk
¹
,
Борисенко
²
,
Golden
³

et al. 2002
Phys. Rev. B
93
6
94
1
View full text Add to dashboard Cite