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# Search results

36 records were found.

## Universal waterfalls-like feature in the spectral function of high temperature superconductors

Comment: to be published in the proceeding of the M2S-HTS - July 2006

## Extremely Correlated Fermi Liquid Description of Normal State ARPES in Cuprates

Comment: Published version, 5 figs; published 29 July (2011)

## Generalized Spectral Signatures of Electron Fractionalization in Quasi-One and -Two Dimensional Molybdenum Bronzes and Superconducting Cuprates

Comment: 7 pages, 8 figures

## Strong Influence of Phonons on the Electron Dynamics of Bi2212

The sudden change of the velocity, so-called "kink," of the dispersing peak in angle resolved photoelectron spectroscopy is a well-known feature in the high temperature superconducting cuprates. Currently, the origin of the kink is being much debated, but a consensus has not emerged yet. Here, we present a study of the momentum evolution of the kink structure from the nodal region towards the anti-nodal region, for optimally doped Bi2212 sample. We show that the observed temperature dependence of the kink structure in both regions of the momentum space is consistent with a scenario in which phonons contribute strongly to the kink.

## Low energy excitations in graphite: The role of dimensionality and lattice defects

Comment: 10 pages, 15 figures

## Unusual oxygen isotope effects in cuprates -- importance of doping

A recent angle resolved photoelectron spectroscopy (ARPES) study by Douglas et al. \cite {dessau-comment} on oxygen isotope exchanged Bi_2Sr_2CaCu_2O$_{8+\delta}$ superconductors reported an absence of isotope effect at optimal doping, questioning the previous work by us \cite {gweon-nature}. Here, we report a new result that sheds light on this puzzling discrepancy as well as the nature of the electron lattice interaction in the cuprates: the anomalous isotope effect at optimal doping \cite {gweon-nature}, re-confirmed here, vanishes on a mere 2 % overdoping of holes. This result implies a rapid change of the nature of the electron-lattice interaction near optimal doping. We also find that the data by Douglas et al. \cite {dessau-comment} are actually characteristic of significantly over-doped samples, not of optimally doped samples...

## Photoemission view of electron fractionalization in quasi-one dimensional metal Li$_{0.9}$Mo$_6$O$_{17}$

Comment: submitted to SCES '01

## Temperature Dependent 5f-states in URu_2Si_2

Comment: 4 pages, 1 figure, submitted to SCES'01, figure font corrected

## Bulk Band Gaps in Divalent Hexaborides: A Soft X-Ray Emission Study

Comment: 5 pages, 2 figures, submitted to VUV-13

## Strong and complex electron-lattice correlation in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$

We discuss the nature of electron-lattice interaction in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ samples, using isotope effect (IE) in angle resolved photoemission spectroscopy (ARPES) data. The IE in the ARPES line width and the IE in the ARPES dispersion are both quite large, implying a strong electron-lattice correlation. The strength of the electron-lattice interaction is intermediate,'' i.e. stronger than the Migdal-Eliashberg regime but weaker than the small polaron regime, requiring a more general picture of the ARPES kink'' than the commonly used Migdal-Eliashberg picture. The two IEs also imply a complex interaction, due to their strong momentum dependence and their differing sign behaviors. In sum, we propose an intermediate-strength coupling of electrons to localized lattice vibrations via charge density flu...