High resolution angle-resolved photoemission measurements on an underdoped (La(2-x)Srx)CuO4 system show that, at energies below 70 meV, the quasiparticle peak is well defined around the (pi/2,pi/2) nodal region and disappears rather abruptly when the momentum is changed from the nodal point to the (pi,0) antinodal point along the underlying "Fermi surface." It indicates that there is an extra low energy scattering mechanism acting upon the antinodal quasiparticles. We propose that this mechanism is the scattering of quasiparticles across the nearly parallel segments of the Fermi surface near the antinodes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.92.187001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Normal Fermi Surface in the Nodal Superconductor CeCoIn_{5} Revealed via Thermal Conductivity.
Phys Rev Lett
June 2024
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
The thermal conductivity of heavy-fermion superconductor CeCoIn_{5} was measured with a magnetic field rotating in the tetragonal a-b plane, with the heat current in the antinodal direction, J|| [100]. We observe a sharp resonance in thermal conductivity for the magnetic field at an angle Θ≈12°, measured from the heat current direction [100]. This resonance corresponds to the reported resonance at an angle Θ^{'}≈33° from the direction of the heat current applied along the nodal direction, J||[110].
View Article and Find Full Text PDFEmergent normal fluid in the superconducting ground state of overdoped cuprates.
Nat Commun
June 2024
State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, P. R. China.
Article Synopsis
- - The disappearance of superconductivity in overdoped cuprates is debated, and this study uses scanning tunneling spectroscopy to explore quasiparticle interference in BiSrCuO at varying hole densities.
- - As doping increases, a unique arc-like quasiparticle interference pattern develops, even at zero bias, indicating a shift in behavior incompatible with traditional models of d-wave superconductivity.
- - The findings suggest that a new type of normal fluid arises from particle interactions, leading to a decrease in superfluid density and a suppression of superconductivity in overdoped cuprates.
Unambiguous Fluctuation Decomposition of the Self-Energy: Pseudogap Physics beyond Spin Fluctuations.
Phys Rev Lett
May 2024
Institute for Solid State Physics, TU Wien, 1040 Vienna, Austria.
Correlated electron systems may give rise to multiple effective interactions whose combined impact on quasiparticle properties can be difficult to disentangle. We introduce an unambiguous decomposition of the electronic self-energy which allows us to quantify the contributions of various effective interactions simultaneously. We use this tool to revisit the hole-doped Hubbard model within the dynamical cluster approximation, where commonly spin fluctuations are considered to be the origin of the pseudogap.
View Article and Find Full Text PDFCritical Current Density in -Wave Hubbard Superconductors.
Materials (Basel)
December 2022
School of Engineering and Space Park Leicester, University of Leicester, University Rd., Leicester LE1 7RH, UK.
In this work, the Generalized Hubbard Model on a square lattice is applied to evaluate the electrical current density of high critical temperature -wave superconductors with a set of Hamiltonian parameters allowing them to reach critical temperatures close to 100 K. The appropriate set of Hamiltonian parameters permits us to apply our model to real materials, finding a good quantitative fit with important macroscopic superconducting properties such as the critical superconducting temperature (Tc) and the critical current density (Jc). We propose that much as in a dispersive medium, in which the velocity of electrons can be estimated by the gradient of the dispersion relation ∇ε(k), the electron velocity is proportional to ∇E(k) in the superconducting state (where E(k)=(ε(k)-μ)2+Δ2(k) is the dispersion relation of the quasiparticles, and is the electron wave vector).
View Article and Find Full Text PDFResilient Fermi Liquid and Strength of Correlations near an Antiferromagnetic Quantum Critical Point.
Phys Rev Lett
February 2022
Département de Physique, Institut quantique, and RQMP Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.
Near the antiferromagnetic quantum critical point (QCP) of electron-doped cuprate superconductors, angle-resolved photoemission experiments detect hot spots where the Fermi surface disappears. Here, we demonstrate, using the two-particle self-consistent theory, that in the antinodal region the Fermi liquid remains stable for a broad range of angles on the Fermi surface and for all dopings near the QCP. We show how the quasiparticle weight Z and effective mass m^{*} change and then abruptly become meaningless as the hot spots are approached.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!