113 research outputs found
Anomalies of the infrared-active phonons in underdoped YBCO as an evidence for the intra-bilayer Josephson effect
The spectra of the far-infrared c-axis conductivity of underdoped YBCO
crystals exhibit dramatic changes of some of the phonon peaks when going from
the normal to the superconducting state. We show that the most striking of
these anomalies can be naturally explained by changes of the local fields
acting on the ions arising from the onset of inter- and intra-bilayer Josephson
effects.Comment: Revtex, epsf, 6 pages, 3 figures encapsulated in tex
Quantum mechanical picture of the coupling between interlayer electronic excitations and infrared active phonons in bilayer cuprate superconductors
The formula frequently used to describe the c-axis infrared response of the
coupled electron-phonon system of bilayer cuprate superconductors and providing
important insights into the physics of these materials has been originally
obtained at the level of the phenomenological multilayer model. Here we derive
it using diagrammatic perturbation theory
Approximate tight-binding sum rule for the superconductivity related change of c-axis kinetic energy in multilayer cuprate superconductors
We present an extension of the c-axis tight-binding sum rule discussed by
Chakravarty, Kee, and Abrahams [Phys. Rev. Lett. 82, 2366 (1999)] that applies
to multilayer high-Tc cuprate superconductors (HTCS) and use it to
estimate--from available infrared data--the change below Tc of the c-axis
kinetic energy, Hc, in YBa2Cu3O(7-delta) (delta=0.45,0.25,0.07), Bi2Sr2CaCu2O8,
and Bi2Sr2Ca2Cu3O10. In all these compounds Hc decreases below Tc and except
for Bi2Sr2CaCu2O8 the change of Hc is of the same order of magnitude as the
condensation energy. This observation supports the hypothesis that in
multilayer HTCS superconductivity is considerably amplified by the interlayer
tunnelling mechanism.Comment: 6 pages, 2 figure
Selfconsistent gauge-invariant theory of in-plane infrared response of high-Tc cuprate superconductors involving spin fluctuations
We report on results of our theoretical study of the in-plane infrared
conductivity of the high-Tc cuprate superconductors using the model where
charged planar quasiparticles are coupled to spin fluctuations. The
computations include both the renormalization of the quasiparticles and the
corresponding modification of the current-current vertex function (vertex
correction), which ensures gauge invariance of the theory and local charge
conservation in the system. The incorporation of the vertex corrections leads
to an increase of the total intraband optical spectral weight (SW) at finite
frequencies, a SW transfer from far infrared to mid infrared, a significant
reduction of the SW of the superconducting condensate, and an amplification of
characteristic features in the superconducting state spectra of the inverse
scattering rate 1/tau. We also discuss the role of selfconsistency and propose
a new interpretation of a kink occurring in the experimental low temperature
spectra of 1/tau around 1000cm^{-1}.Comment: 9 pages with 6 figures, submitted to Physical Review
Interpretation of the in-plane infrared response of the high-Tc cuprate superconductors involving spin fluctuations revisited
The in-plane infrared response of the high-Tc cuprate superconductors was
studied using the spin-fermion model, where charged quasiparticles of the
copper-oxygen planes are coupled to spin fluctuations. First, we analyzed
structures of the superconducting-state conductivity reflecting the coupling of
the quasiparticles to the resonance mode observed by neutron scattering. The
conductivity computed with the input spin susceptibility in the simple form of
the mode exhibits two prominent features: an onset of the real part of the
conductivity starting around the frequency of the mode omega_{0} and a maximum
of a related function W(omega), roughly proportional to the second derivative
of the scattering rate, centered approximately at
omega=omega_{0}+Delta_{0}/hbar, where Delta_{0} is the maximum value of the
superconducting gap. The two structures are well known from earlier studies.
Their physical meaning, however, has not been sufficiently elucidated thus far.
Our analysis involving quasiparticle spectral functions provides a clear
interpretation. Second, we explored the role played by the spin-fluctuation
continuum. Third, we investigated the temperature dependence of the
conductivity, of the intraband spectral weight, and of the effective kinetic
energy. The changes of the latter two quantities below Tc are determined by the
formation of the gap, by a feedback effect of the spin fluctuations on the
quasiparticles, and by a significant shift of the chemical potential.Comment: 20 pages, 18 figures, submitted to Physical Review
Extracting the electron--boson spectral function F() from infrared and photoemission data using inverse theory
We present a new method of extracting electron-boson spectral function
F() from infrared and photoemission data. This procedure is
based on inverse theory and will be shown to be superior to previous
techniques. Numerical implementation of the algorithm is presented in detail
and then used to accurately determine the doping and temperature dependence of
the spectral function in several families of high-T superconductors.
Principal limitations of extracting F() from experimental
data will be pointed out. We directly compare the IR and ARPES
F() and discuss the resonance structure in the spectra in
terms of existing theoretical models
Spectroscopic distinction between the normal state pseudogap and the superconducting gap of cuprate high T_{c} superconductors
We report on broad-band infrared ellipsometry measurements of the c-axis
conductivity of underdoped RBa_{2}Cu_{3}O_{7-d} (R=Y, Nd, and La) single
crystals. Our data provide a detailed account of the spectral weight (SW)
redistributions due to the normal state pseudogap (PG) and the superconducting
(SC) gap. They show that these phenomena involve different energy scales,
exhibit distinct doping dependencies and thus are likely of different origin.
In particular, the SW redistribution in the PG state closely resembles the one
of a conventional charge- or spin density wave (CDW or SDW) system.Comment: 4 pages, 4 figure
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