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Transport phase diagram and anomalous metallicity in superconducting infinite-layer nickelates.
Nat Commun
November 2024
High Field Magnet Laboratory (HFML-FELIX) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED, Nijmegen, Netherlands.
Article Synopsis
- The study investigates whether high-T cuprates and infinite-layer nickelates share similar interactions affecting their normal and superconducting states, highlighting recent advancements in high-quality nickelate crystals.
- Recent research shows that nickelates have a superconducting dome and comparable transport properties to cuprates, but the normal state behavior in strong magnetic fields needs further exploration.
- Findings from new NdSrNiO films indicate that the normal-state resistivity in infinite-layer nickelates displays non-Fermi-liquid behavior across various doping levels, suggesting both systems share characteristics of a quantum critical phase despite differences in their charge dynamics.
Free energy of a two-liquid system of charge carriers in strongly coupled electron and phonon fields and common nature of three phases in hole-doped cuprates.
J Phys Condens Matter
May 2024
Southern Federal University, Zorge str. 5, 344090 Rostov-on-Don, Russia.
Hole-doped cuprates exhibit partially coexisting pseudogap (PG), charge ordering (CO) and superconductivity; we show that there exists a class of systems in which they have a single nature as it has recently been supposed. Since the charge-ordered phase exhibits large frozen deformation of the lattice, we develop a method for calculating the phase diagram of a system with strong long-range (Fröhlich) electron-phonon interaction. Using a variational approach, we calculate the free energy of a two-liquid system of carriers with cuprate-like dispersion comprising a liquid of autolocalized carriers (large polarons and bipolarons) and Fermi liquid of delocalized carriers.
View Article and Find Full Text PDFFrustration shapes multi-channel Kondo physics: a star graph perspective.
J Phys Condens Matter
May 2023
Department of Physical Sciences, Indian Institute of Science Education and Research-Kolkata, Mohanpur, W.B. 741246, India.
We study the overscreened multi-channel Kondo (MCK) model using the recently developed unitary renormalisation group technique. Our results display the importance of ground state degeneracy in explaining various important properties like the breakdown of screening and the presence of local non-Fermi liquids (NFLs). The impurity susceptibility of the intermediate coupling fixed point Hamiltonian in the zero-bandwidth (or star graph) limit shows a power-law divergence at low temperature.
View Article and Find Full Text PDFSpectral Function of the Chiral One-Dimensional Fermi Liquid in the Regime of Strong Interactions.
Phys Rev Lett
April 2022
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
We study momentum-resolved tunneling into a system of spinless chiral one-dimensional fermions, such as electrons at the edge of an integer quantum Hall system. Interactions between particles give rise to broadening of the spectral function of the system. We develop an approach that enables one to obtain the shape of the peak in the spectral function in the regime of strong interaction.
View Article and Find Full Text PDFLocal Spectroscopies Reveal Percolative Metal in Disordered Mott Insulators.
Phys Rev Lett
April 2020
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
We elucidate the mechanism by which a Mott insulator transforms into a non-Fermi liquid metal upon increasing disorder at half filling. By correlating maps of the local density of states, the local magnetization, and the local bond conductivity, we find a collapse of the Mott gap toward a V-shaped pseudogapped density of states that occurs concomitantly with the decrease of magnetism around the highly disordered sites but an increase of bond conductivity. These metallic regions percolate to form an emergent non-Fermi liquid phase with a conductivity that increases with temperature.
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