15 research outputs found
Fermiology and electronic homogeneity of the superconducting overdoped cuprate Tl-2201 revealed by quantum oscillations
We report an angular quantum oscillation study of Tl_2Ba_2CuO_{6+delta} for
two different doping levels (Tc = 10K and 26 K) and determine the Fermi surface
size and topology in considerable detail. Our results show that Fermi liquid
behavior is not confined to the edge of the superconducting dome and is robust
up to at least T_c^{max}/3.5. Superconductivity is found to survive up to a
larger doping p_c = 0.31 than in La_{2-x}Sr_xCuO_4. Our data imply that
electronic inhomogeneity does not play a significant role in the loss of
superconductivity and superfluid density in overdoped cuprates, and point
towards a purely magnetic or electronic pairing mechanismComment: 4 page
Doping Evolution of the Underlying Fermi Surface in La2-xSrxCuO4
We have performed a systematic doping dependent study of
LaSrCuO (LSCO) (0.030.3) by angle-resolved
photoemission spectroscopy. In the entire doping range, the underlying ``Fermi
surface" determined from the low energy spectral weight approximately satisfies
Luttinger's theorem, even down to the lightly-doped region. This is in strong
contrast to the result on CaNaCuOCl (Na-CCOC), which shows
a strong deviation from Luttinger's theorem. The differences between LSCO and
Na-CCOC are correlated with the different behaviors of the chemical potential
shift and spectral weight transfer induced by hole doping.Comment: 4 pages, 4 figure
The hierarchy of multiple many-body interaction scales in high-temperature superconductors
To date, angle-resolved photoemission spectroscopy has been successful in
identifying energy scales of the many-body interactions in correlated
materials, focused on binding energies of up to a few hundred meV below the
Fermi energy. Here, at higher energy scale, we present improved experimental
data from four families of high-Tc superconductors over a wide doping range
that reveal a hierarchy of many-body interaction scales focused on: the low
energy anomaly ("kink") of 0.03-0.09eV, a high energy anomaly of 0.3-0.5eV, and
an anomalous enhancement of the width of the LDA-based CuO2 band extending to
energies of ~ 2 eV. Besides their universal behavior over the families, we find
that all of these three dispersion anomalies also show clear doping dependence
over the doping range presented.Comment: 7 pages, 6 figure
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Hierarchy of multiple many-body interaction scales in high-temperature superconductors
To date, angle-resolved photoemission spectroscopy has been successful in identifying energy scales of the many-body interactions in correlated materials, focused on binding energies of up to a few hundred meV below the Fermi energy. Here, at higher energy scale, we present improved experimental data from four families of high-T{sub c} superconductors over a wide doping range that reveal a hierarchy of many-body interaction scales focused on: the low energy anomaly ('kink') of 0.03-0.09eV, a high energy anomaly of 0.3-0.5eV, and an anomalous enhancement of the width of the LDA-based CuO{sub 2} band extending to energies of {approx} 2 eV. Besides their universal behavior over the families, we find that all of these three dispersion anomalies also show clear doping dependence over the doping range presented
Lifshitz quantum phase transitions and Fermi surface transformation with hole doping in high- superconductors
We study the doping evolution of the electronic structure in the normal phase
of high- cuprates. Electronic structure and Fermi surface of cuprates with
single CuO layer in the unit cell like LaSrCuO have been
calculated by the LDA+GTB method in the regime of strong electron correlations
(SEC) and compared to ARPES and quantum oscillations data. We have found two
critical concentrations, and , where the Fermi surface
topology changes. Following I.M. Lifshitz ideas of the quantum phase
transitions (QPT) of the 2.5-order we discuss the concentration dependence of
the low temperature thermodynamics. The behavior of the electronic specific
heat is similar to the Loram and Cooper
experimental data in the vicinity of .Comment: 8 pages, 4 figure