Systematics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>c</mml:mi></mml:math>-axis phonons in the thallium- and bismuth-based cuprate superconductors

Tsvetkov, A. Yu.; Dulić, Diana; Marel, D. van der; Damascelli, A.; Kaljushnaia, G.A.; Gorina, J. I.; Senturina, N. N.; Kolesnikov, N. N.; Ren, Zhifeng; Wang, J.H.; Menovsky, A.A.; Palstra, Thomas

doi:10.1103/physrevb.60.13196

Cited by 38 publications

(36 citation statements)

References 54 publications

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“…Our calculated results for the infrared-active 2u A modes are in good agreement with new experiments obtained by ellipsometric measurements on single crystals [48]. The assignments of the c-axis 2u A -IR-phonons are discussed controversially in the literature [49,50] and also as far as the Raman-active 1g A modes are concerned different experimental groups have published rather different and contradictory assignments [51][52][53]. In particular the origin of the high-frequency vibrations around 460 and 630 cm -1 in the Raman spectra of Bi-2212 is controversial and there is a strong dispute concerning the question of which mode can be attributed to the oxygens O 2 located in the SrO plane and which one to the oxygens O 3 in the BiO plane.…”

Section: Infrared-and Raman-active C-axis Modes Of Bi-based Cuprate Ssupporting

confidence: 89%

Phonons, electronic charge response and electron–phonon interaction in the high‐temperature superconductors

Falter¹

2004

Physica Status Solidi (b)

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We investigate the complete phonon dispersion, the phonon induced electronic charge response and the corresponding self-consistent change of the crystal potential an electron feels as a direct measure of the electron-phonon interaction in the high-temperature superconductors within a microscopic model in the framework of linear response theory. Moreover, dielectric and infrared properties are calculated. The experimentally observed strong renormalization of the in-plane oxygen bond-stretching modes which appears upon doping in the high-temperature superconductors is discussed. It is shown that the characteristic softening, indicating a strong nonlocal electron-phonon interaction, is most likely a generic effect of the CuO plane and is driven by a nonlocal coupling of the displaced ions to the localized charge-fluctuations at the Cu and the O xy ions. At hand of the oxygen bond-stretching modes it is illustrated how lattice-, charge-and spin-degrees of freedom may act synergetically for anisotropic pairing in the hightemperature superconductors. The different behaviour of these modes during the insulator-metal transition via the underdoped phase is calculated and from a comparison of these generic modes in the different phases conclusions about the electronic state are drawn. For the non-cuprate potassium doped hightemperature superconductor Ba-Bi-O also a very strong and anisotropic renormalization of the oxygen bond-stretching modes is predicted. In another investigation c-axis polarized infrared-and Raman-active modes of the HTSC's are calculated in terms of charge fluctuations and anisotropic dipole-fluctuations. Mode assignments discussed controversially in the literature are proposed. Finally, interlayer phonons propagating along the c-axis and their accompanying charge response are investigated. Depending on the strength of the interlayer coupling calculations are performed ranging from the static, adiabatic response regime to the non-adiabatic regime where dynamical screening of the bare Coulomb interaction and phonon-plasmon coupling becomes relevant within a certain region around the direction of the c-axis. A comparison with the experimental situation is given. Both, the oxygen bond-stretching modes calculated in adiabatic approximation and the non-adiabatic coupled c-axis phonon-plasmon modes are found to be important for pairing via lattice-and charge-degrees of freedom. Favouring aspects to achieve hightemperature superconductivity are also discussed.

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Section: Infrared-and Raman-active C-axis Modes Of Bi-based Cuprate Ssupporting

confidence: 89%

Phonons, electronic charge response and electron–phonon interaction in the high‐temperature superconductors

Falter¹

2004

Physica Status Solidi (b)

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“…6d) at (14–17), (30–32), (41–44), (54–58), and (70–74) meV and they are reproducible from several independent measurements. These features show reasonably good agreement with the phonon modes observed in the same material by infrared reflectance 114 and Raman scattering 115. Considering the rather weak magnetic signal 116, and the absence of magnetic mode at 15 K for the heavily overdoped Pb‐Bi2201 sample ( T c ∼5 K), our present results leave no doubt that the multiple phonon modes are involved in the electron coupling.…”

Section: Vuv Laser‐based Arpes On Cu‐based High‐tc Superconductorssupporting

confidence: 88%

High resolution angle‐resolved photoemission spectroscopy on Cu‐based and Fe‐based high‐T_c superconductors

Zhou

Liu

Meng

et al. 2010

Physica Status Solidi (a)

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Research on high temperature superconductivity has been a prominent topic in condensed matter physics. Angle‐resolved photoemission spectroscopy (ARPES) is a powerful technique in probing the electronic structure, energy gap and many‐body effects in high temperature superconductors, and other materials. In this paper, we first introduce our effort in developing vacuum ultra‐violet (VUV) laser‐based photoemission techniques, including angle‐resolved, spin‐resolved, time‐of‐flight electron energy analyzer‐based ones. Then, we highlight some of our recent results on Cu‐based high temperature superconductors utilizing our VUV laser‐based ARPES including many‐body effects in hole‐ and electron‐doped cuprates, superconducting gap and pseudogap, and the observation of Fermi pockets. In the last part of this paper, we briefly introduce our ARPES study on band structure, Fermi surface, superconducting gap, and many‐body effects in the newly discovered Fe‐based compounds.

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“…To the best of our knowledge this is the first report of the c-polarized phonon spectra of the Bi2201 single crystal. Also we would like to note that the c axis spectra of the Bi2201 reported here exhibit remarkable difference with respect to those of the isostructural single layer Tl compound Tl2201 [13]. Six strong TO phonon features at around 109, 165, 208, 301, 385, and 586 cm −1 are clearly identified in the σ 1 (ω) spectrum of Bi2201, as shown in Figure 4(a), whereas only five A 2u character modes are expected from the consideration in the ideal I4/mmm space group (see Tables 1 and 2).…”

Section: Bi2212mentioning

confidence: 99%

c-axis lattice dynamics in Bi-based cuprate superconductors

et al. 2004

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We present results of a systematic study of the c axis lattice dynamics in single layer Bi 2 Sr 2 CuO 6 (Bi2201), bilayer Bi 2 Sr 2 CaCu 2 O 8 (Bi2212) and trilayer Bi 2 Sr 2 Ca 2 Cu 3 O 10 (Bi2223) cuprate superconductors. Our study is based on both experimental data obtained by spectral ellipsometry on single crystals and theoretical calculations. The calculations are carried out within the framework of a classical shell model, which includes long-range Coulomb interactions and short-range interactions of the Buckingham form in a system of polarizable ions. Using the same set of the shell model parameters for Bi2201, Bi2212 and Bi2223, we calculate the frequencies of the Brillouin-zone center phonon modes of A 2u symmetry and suggest the phonon mode eigenvector patterns. We achieve good agreement between the calculated A 2u eigenfrequencies and the experimental values of the c axis TO phonon frequencies which allows us to make a reliable phonon mode assignment for all three Bi-based cuprate superconductors. We also present the results of our shell model calculations for the Γ-point A 1g symmetry modes in Bi2201, Bi2212 and Bi2223 and suggest an assignment that is based on the published experimental Raman spectra. The superconductivity-induced phonon anomalies recently observed in the c axis infrared and resonant Raman scattering spectra in trilayer Bi2223 are consistently explained with the suggested assignment.

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Systematics ofc-axis phonons in the thallium- and bismuth-based cuprate superconductors

Cited by 38 publications

References 54 publications

Phonons, electronic charge response and electron–phonon interaction in the high‐temperature superconductors

Phonons, electronic charge response and electron–phonon interaction in the high‐temperature superconductors

High resolution angle‐resolved photoemission spectroscopy on Cu‐based and Fe‐based high‐T_c superconductors

c-axis lattice dynamics in Bi-based cuprate superconductors

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Systematics ofc-axis phonons in the thallium- and bismuth-based cuprate superconductors

Cited by 38 publications

References 54 publications

Phonons, electronic charge response and electron–phonon interaction in the high‐temperature superconductors

Phonons, electronic charge response and electron–phonon interaction in the high‐temperature superconductors

High resolution angle‐resolved photoemission spectroscopy on Cu‐based and Fe‐based high‐Tc superconductors

c-axis lattice dynamics in Bi-based cuprate superconductors

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High resolution angle‐resolved photoemission spectroscopy on Cu‐based and Fe‐based high‐T_c superconductors