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Henn, R.; Strach, T.; Schönherr, E.; Cardona, M.

doi:10.1103/physrevb.55.3285

Cited by 58 publications

(50 citation statements)

References 30 publications

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“…By performing pump-probe measurements as a function of temperature and excitation density, we are able to map the characteristic responses of specific low-energy vibrations involving almost-pure barium (Ba) and copper (Cu) c-axis displacements [14]. In agreement with previous results [14][15][16][17][18][19][20][21], the photo-excited amplitude associated to the Ba mode maps the onset of the superconductivity while the amplitude of the oscillation associated to the Cu displacement seems independent from the superconducting phase. Here we perform an intensity-dependent study and, by comparing experimental and theoretical results, we are able to measure the correlation length of the atomic displacements triggered by visible photon absorption.…”

Section: Introductionsupporting

confidence: 84%

Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

et al. 2017

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The interaction between phonons and high-energy excitations of electronic origin in cuprates and their role in the superconducting mechanisms is still controversial. Here we use coherent vibrational time-domain spectroscopy together with density functional and dynamical mean-field theory calculations to establish a direct link between the c-axis phonon modes and the in-plane electronic charge excitations in optimally doped YBCO. The non-equilibrium Raman tensor is measured by means of the broadband "coherent-phonon" response in pump-probe experiments and is qualitatively described by our model using DFT in frozen phonon approximation plus single band DMFT to account for the electronic correlations. The major outcome of our experimental and theoretical study is to establish the link between out-of-plane copper ions displacements and the inplane electronic correlations, and to estimate at few unit cells the correlation length of the associated phonon mode. The approach introduced here could help revealing the complex interplay between fluctuations of different nature and spatial correlation in several strongly-correlated materials.

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Section: Introductionsupporting

confidence: 84%

Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

et al. 2017

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“…[14][15][16] Indeed, Ru-1212 is structurally similar to the rare-earth cuprate superconductors like Y-123 except that the Cu-O chain layers are replaced by RuO 2 square planar layers. Ignoring the rotations of the RuO 6 octahedra, an approximate structure is then of tetragonal symmetry P 4/mmm.…”

Section: Resultsmentioning

confidence: 99%

“…At all temperatures investigated five optical phonon modes near 128, 151, 190, 288, and 654 cm −1 are clearly observed. It is well established [13][14][15] that the modes appearing in the spectra of anisotropic ceramics correspond to phonon modes polarized along c-axis. The ab-plane response from phonons in the reflectivity spectra (left panel, Fig.…”

Section: Resultsmentioning

confidence: 99%

Phonon anomalies and electron-phonon interaction in theRuSr2GdCu2O
Boris
¹
,
Mandal
²
,
Bernhard
³

et al. 2001
Phys. Rev. B
24
3
8
2
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Critical behavior of the infrared reflectivity of RuSr2GdCu2O8 ceramics is observed near the superconducting TSC = 45 K and magnetic TM = 133 K transition temperatures. The optical conductivity reveals the typical features of the c-axis optical conductivity of strongly underdoped multilayer superconducting cuprates. The transformation of the Cu-O bending mode at 288 cm −1 to a broad absorption peak at the temperatures between T * = 90 K and TSC is clearly observed, and is accompanied by the suppression of spectral weight at low frequencies. The correlated shifts to lower frequencies of the Ru-related phonon mode at 190 cm −1 and the mid-IR band at 4800 cm −1 on decreasing temperature below TM are observed. It provides experimental evidence in favor of strong electron-phonon coupling of the charge carriers in the Ru-O layers which critically depends on the Ru core spin alignment. The underdoped character of the superconductor is explained by strong hole depletion of the CuO2 planes caused by the charge carrier self-trapping at the Ru moments.

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“…While the properties of the IR-active phonon modes are indeed well known for the Y123 system [8,9,10,11], the situation is not that clear for the bilayer high-T c compounds of the type A 2 Sr 2 CaCu 2 O 8 (A2212; A = Tl, Bi). Despite of experimental [5,6,12,13] and theoretical [14,15,16] efforts, the assignment of the c axis IR phonon modes in Bi2212 and Tl2212 remains contradictory, as discussed in [13].…”

Section: Introductionmentioning

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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Isotope effects on the optical phonons ofYBa2Cu3

Cited by 58 publications

References 30 publications

Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

Phonon anomalies and electron-phonon interaction in theRuSr2GdCu2O
Boris
¹
,
Mandal
²
,
Bernhard
³

et al. 2001
Phys. Rev. B
24
3
8
2
View full text Add to dashboard Cite

c-axis lattice dynamics in Bi-based cuprate superconductors

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Isotope effects on the optical phonons ofYBa2Cu3

Cited by 58 publications

References 30 publications

Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

Phonon anomalies and electron-phonon interaction in theRuSr2GdCu2OBoris1, Mandal2, Bernhard3 et al. 2001Phys. Rev. B24382View full textAdd to dashboardCite

c-axis lattice dynamics in Bi-based cuprate superconductors

Contact Info

Product

Resources

About

Phonon anomalies and electron-phonon interaction in theRuSr2GdCu2O
Boris
¹
,
Mandal
²
,
Bernhard
³

et al. 2001
Phys. Rev. B
24
3
8
2
View full text Add to dashboard Cite