Optical anisotropy and electron-phonon coupling in Bi2Sr2CaCu2O8 single crystals

Zibold, A.; Dürrler, M.; Gaymann, A.; Geserich, H. P.; Nücker, N.; Burlakov, V. M.; Müller, Patrick

doi:10.1016/0921-4534(92)90884-f

Cited by 37 publications

(7 citation statements)

References 16 publications

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“…Before addressing the microscopic origin of the resonances, we discuss the quantitative description of the Fano interference, which is strongly constrained by the independent ε 1 (ω) and σ 1 (ω) spectra extracted from our ellipsometric data. A detailed comparison of these data to the results of a Green's function analysis of the optical response of two narrow oscillators coupled to a continuum [39] yields the frequencies (ω j ), spectral weights (S j ), and Fano asymmetry parameters (q j ) of the resonances (Appendix C). The total spectral weight of all infrared oscillators (comprising the resonances and the continuum) defines the effective number of electrons per Ni atom contributing to the associated transitions, Fig.…”

Section: Resultsmentioning

confidence: 99%

Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5

et al. 2017

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We report the complex dielectric function of the quasi-one-dimensional chalcogenide Ta2NiSe5, which exhibits a structural phase transition that has been attributed to exciton condensation below Tc = 326 K [1, 2], and of the isostructural Ta2NiS5 which does not exhibit such a transition. Using spectroscopic ellipsometry, we have detected exciton doublets with pronounced Fano lineshapes in both the compounds. The exciton Fano resonances in Ta2NiSe5 display an order of magnitude higher intensity than those in Ta2NiS5. In conjunction with prior theoretical work [3], we attribute this observation to the giant oscillator strength of spatially extended exciton-phonon bound states in Ta2NiSe5. The formation of exciton-phonon complexes in Ta2NiS5 and Ta2NiSe5 is confirmed by the pronounced temperature dependence of sharp interband transitions in the optical spectra, whose peak energies and widths scale with the thermal population of optical phonon modes. The description of the optically excited states in terms of strongly overlapping exciton complexes is in good agreement with the hypothesis of an EI ground state. arXiv:1702.05953v1 [cond-mat.str-el]

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Section: Resultsmentioning

confidence: 99%

Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5

et al. 2017

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“…We analyzed the Fano lineshapes of the external group within a phenomenological approach. 37,38 It assigns independent modes to the various spectral contributions of the electronic excitations and couples them linearly to the phononic oscillators. In FIR and MIR spectra of LCMO, three electronic continua are typically identified: a "continuum of incoherent electronic excitations" (cf.…”

Section: Discussionmentioning

confidence: 99%

“…We analyze the present LCMO data by applying the phenomenological approach of Burlakov et al, 37,38 taking into account several adjacent phonons which interact with electronic continua. The advantage of this approach is the explicit specification of and control over the electronic continua.…”

Section: Fano Lineshapes In Lcmomentioning

confidence: 99%

Cooperative dynamics in doped manganite films: Phonon anomalies in the ferromagnetic state

et al. 2004

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We present optical measurements of phononic excitations in La 2/3 Ca 1/3 MnO 3 (LCMO) and La 2/3 Sr 1/3 MnO 3 (LSMO) thin films covering the full temperature range from the metallic ferromagnetic to the insulating paramagnetic phase. All eight phonons expected for the R3c symmetry in LSMO and 17 out of the expected 25 phonons for the Pnma symmetry in LCMO have been determined. Close to the ferromagnetic-toparamagnetic transition both compounds reveal an anomalous behavior but with different characteristics. Anomalies in the phononic spectra are a manifestation of the coupling of lattice degrees of freedom (DOF) to electronic DOF. Specifically, the low-frequency external group proves to be an indicator for lattice modifications induced by electronic correlations. The enhanced electron-phonon coupling in LCMO is responsible for Fano-like interference effects of distinct phonon modes with electronic continuum excitations: we observe asymmetric phonon line shapes, mode splitting and spectral weight transfer between modes.

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“…Thereafter, "Fano profiles" have been observed in a number of spectra, including those where phonon discrete states interact with a continuum background due to itinerant charges. In high critical temperature superconductors (HCTS), phonon Fano profiles have been detected with the electric field of the radiation polarized along the c-axis, either in [3][4][5][6] YBa 2 Cu 3 O 7−δ , and in 7 Bi 2 Sr 2 CaCu 2 O 8 .…”

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Fano effect in thea−bplane ofNd1.96Ce0.04
Lupi
¹
,
Capizzi
²
,
Calvani
³

et al. 1998
Phys. Rev. B
45
1
29
0
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Reflectance measurements in properly selected samples of Nd 1.96 Ce 0.04 CuO 4+y with different carrier concentrations provide a firm evidence of Fano antiresonances for the four transverse optical E u phonons in the a − b plane. A fit of the whole optical conductivity has been performed, without any previous subtraction of the electronic background. Those fits, as well as the dependence on temperature of the renormalized phonon frequencies, show that the electronic continuum is provided by the same polaron band which characterizes the optical conductivity of all the insulating parent compounds of high T c superconductors. The relevance of these results for the metallic and superconducting phase of cuprates is discussed. 74.30.Gn, 72.10Di, 74.70Vy, 78.20C

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Optical anisotropy and electron-phonon coupling in Bi2Sr2CaCu2O8 single crystals

Cited by 37 publications

References 16 publications

Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5

Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5

Cooperative dynamics in doped manganite films: Phonon anomalies in the ferromagnetic state

Fano effect in thea−bplane ofNd1.96Ce0.04
Lupi
¹
,
Capizzi
²
,
Calvani
³

et al. 1998
Phys. Rev. B
45
1
29
0
View full text Add to dashboard Cite

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Optical anisotropy and electron-phonon coupling in Bi2Sr2CaCu2O8 single crystals

Cited by 37 publications

References 16 publications

Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5

Giant exciton Fano resonance in quasi-one-dimensional Ta2NiSe5

Cooperative dynamics in doped manganite films: Phonon anomalies in the ferromagnetic state

Fano effect in thea−bplane ofNd1.96Ce0.04Lupi1, Capizzi2, Calvani3 et al. 1998Phys. Rev. B451290View full textAdd to dashboardCite

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Fano effect in thea−bplane ofNd1.96Ce0.04
Lupi
¹
,
Capizzi
²
,
Calvani
³

et al. 1998
Phys. Rev. B
45
1
29
0
View full text Add to dashboard Cite