Showing 268 results for Author: Elbio R. Dagotto Mir
Sep, 2026
Journal
The discovery of superconductivity with Tc ∼ 80 K in the nickelate Ruddlesden-Popper bilayer La3Ni2O7 at high pressure has opened a new platform for unconventional superconductivity, followed by the subsequent observation of superconductivity in trilayer La4Ni3O10, also at high pressure. Remarkably, ambient-pressure superconductivity was also observed recently in La3Ni2O7…
Aug, 2026
Journal
We numerically investigate the telltale signs of pair-density-wave order (PDW) in the Kondo-Heisenberg chain by focusing on the momentum resolved spectrum in different parameter regimes. Density matrix renormalization group calculations reveal that this phase is characterized by a dispersion with two minima and four Fermi points, indicating the emergence of an effective ne…
Jul, 2026
Journal
One-dimensional (1D) structures provide a unique platform to study the correlated quantum interactions and phase transitions such as unconventional magnetism and superconducting states. Here, we report that iron chalcogenide K3Fe2Se4 with an unusual block-type canted antiferromagnetic (AFM) structure in a clear single chain quasi-1D structure, which is structurally differe…
Jun, 2026
Journal
Motivated by recent developments in the study of quasi-one-dimensional iron systems with Fe2+, we comprehensively study an Fe3+ chalcogenide chain system. Based on first-principles calculations, the Fe3+ chain has a similar electronic structure to that discussed before for the Fe2+ chain, because of the similar Fe𝑋4 (𝑋=S or Se) tetrahedron-chain geometry. Furthermore, a t…
Apr, 2026
Journal
Motivated by recent reports of ambient-pressure superconductivity in La3Ni2O7 films grown on LaSrAlO4, we investigate the superconducting instability in a one-unit-cell (1UC) thin film using ab initio and random-phase approximation techniques. Compared to the high-pressure bulk system, the ratio of interlayer 𝑑3𝑧2−𝑟2 hopping to intralayer 𝑑𝑥2−𝑦2 hopping is suppressed in…
Apr, 2026
Journal
We report the canted antiferromagnetic (AFM) structure together with a spin reorientation in a single chain quasi-one-dimensional (Q-1D) iron chalcogenide Ba2FeSe3. Ba2FeSe3 crystallizes in Pnma (No. 62) orthorhombic structure with linear single iron chains consisting of corner-shared distorted FeSe4 tetrahedra along the 𝑏 axis. Ba2FeSe3 is a narrow-gap semiconductor an…
Mar, 2026
Journal
The discovery of Tc ~ 80 K superconductivity in pressurized La3Ni2O7 has launched a new platform to study high-temperature superconductivity. Using non-perturbative dynamic cluster approximation quantum Monte Carlo calculations, we characterize the magnetic and superconducting pairing behavior of a realistic bilayer two-orbital Hubbard-Hund model of this system that descri…
Feb, 2026
Journal
We report the canted antiferromagnetic (AFM) structure together with a spin reorientation in a single chain quasi-one-dimensional (Q-1D) iron chalcogenide Ba2FeSe3. Ba2FeSe3 crystallizes in Pnma (No. 62) orthorhombic structure with linear single iron chains consisting of corner-shared distorted FeSe4 tetrahedra along the 𝑏 axis. Ba2FeSe3 is a narrow-gap semiconductor an…
Feb, 2026
Journal
The Hubbard model has attracted considerable interest due to its prototypical role in describing strongly interacting electronic systems, such as high-critical-temperature superconductors as well as many novel quantum materials. By introducing next-nearest-neighbor (NNN) hoppings to the Hubbard model, the phase diagram becomes richer, and fascinating phenomena arise in bot…
Nov, 2025
Journal
Fractionalized excitations such as spinons and anyons have emerged as a central theme in condensed matter physics with broad implications for superconductivity, quantum statistics, and quantum computation. The nearly ideal one-dimensional S = 1/2 system β-VOSO4 without long-range order down to 85 mK provides a promising platform to experimentally explore such fractionalize…
Aug, 2025
Journal
Double perovskites containing heavy transition-metal ions are an important family of compounds for the study of the interplay between electron correlation and spin-orbit coupling. Here, by combining magnetic susceptibility, heat capacity, and neutron scattering measurements, we investigate the dipolar and quadrupolar correlations in two prototypal rhenium-based double pero…
Jul, 2025
Journal
Valence bond (VB) states as the formation mechanism of Cooper pairs, eventually leading to high-temperature superconductivity, remain a controversial topic. Although various VB-like states find variational relevance in the description of specific spin models and quantum spin liquids, in the realm of many-body fermionic Hamiltonians, the evidence for such states as ground-s…