Magnetic phase diagram of a two-orbital model for bilayer nickelates with varying doping DOI
Ling-Fang Lin, Yang Zhang, Nitin Kaushal

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(19)

Published: Nov. 18, 2024

Motivated by the discovery of bilayer nickelate superconductor La${}_{3}$Ni${}_{2}$O${}_{7}$, authors investigate here magnetic phase diagrams with varying electronic densities $n$ in a 2\ifmmode\times\else\texttimes\fi{}2\ifmmode\times\else\texttimes\fi{}2 cluster. Rich states are observed, which can be understood three main coupling mechanisms: (1) half-empty ferromagnetic (FM) coupling, (2) half-half antiferromagnetic (AFM) and (3) half-full FM coupling. At half-filling case, mechanism leads to robust (\ensuremath{\pi}, \ensuremath{\pi}, \ensuremath{\pi}) state. For La${}_{3}$Ni${}_{2}$O${}_{7}$ ($n$=1.5) AFM is found strong along $z$ axis, while $x\phantom{\rule{0}{0ex}}y$ plane shows competition between tendencies.

Language: Английский

Magnetic excitations in strained infinite-layer nickelate PrNiO2 films DOI Creative Commons
Qiang Gao, Shiyu Fan, Qisi Wang

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 3, 2024

Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, transition temperature can be enhanced via only ~ 1% compressive strain-tuning with root of enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate magnetic excitations in PrNiO

Language: Английский

Citations

10
Nature of charge density waves and metal-insulator transition in pressurized La3Ni2O7 DOI
Xin-Wei Yi, Ying Meng, Jia-Wen Li

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(14)

Published: Oct. 18, 2024

${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ has garnered widespread interest recently due to its high-temperature superconductivity under pressure, accompanied by charge density wave (CDW) ordering and metal-insulator (MI) transitions in the phase diagram. Here, we explore nature of CDW MI using comprehensive first-principles calculations. Our findings reveal that possesses an antiferromagnetic ground state both low high pressures, with strong Fermi surface nesting contributed flat band leads phonon softening electronic instabilities. Accordingly, several stable orders oxygen octahedral distortions are identified. In presence apical vacancies, identify two different phases exhibiting similar phases, their competition can lead a pressure-induced transition. The estimated transition temperature pressure agree nicely experiments. addition, find electron-phonon coupling is too weak contribute superconductivity. These results suggest unconventional superconducting pairing mechanism mediated fluctuations. Finally, present diagram consistent experimental results. offer crucial insights into interplay superconductivity, CDW, role vacancies pressurized ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$.

Language: Английский

Citations

10
Density-wave-like gap evolution in La3Ni2O7 under high pressure revealed by ultrafast optical spectroscopy DOI Creative Commons
Yanghao Meng, Yi Yang, Hualei Sun

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Nov. 29, 2024

Density wave (DW) order is believed to be correlated with superconductivity in the recently discovered high-temperature superconductor La3Ni2O7. However, experimental investigations of its evolution under high pressure are still lacking. Here, we explore quasiparticle dynamics bilayer nickelate La3Ni2O7 single crystals using ultrafast optical pump-probe spectroscopy pressures up 34.2 GPa. At ambient pressure, temperature-dependent relaxation demonstrate a phonon bottleneck effect due opening an energy gap around 151 K. The scale DW-like determined 66 meV by Rothwarf-Taylor model. Combined recent experiential results, propose that this transition at and low temperature spin density (SDW). With increasing SDW significantly suppressed 13.3 GPa before it completely disappears 26 Remarkably, above 29.4 GPa, observe emergence another approximately 135 K, which probably related predicted charge (CDW) order. Our study provides evidences offering critical insights into correlation between DW density-wave-like orders crucial for unraveling mechanism authors provide evidence when emerges, appears 29

Language: Английский

Citations

10
Closing in on possible scenarios for infinite-layer nickelates: Comparison of dynamical mean-field theory with angular-resolved photoemission spectroscopy DOI Creative Commons
Liang Si,

Eric Jacob,

Wenfeng Wu

et al.

Physical Review Research, Journal Year: 2024, Volume and Issue: 6(4)

Published: Nov. 5, 2024

Conflicting theoretical scenarios for infinite-layer nickelate superconductors have been hotly debated, particularly regarding whether only a single Ni-3dx2−y2 band is relevant at low energies besides electron pockets or multiorbital physics including Ni-3dz2 instead essential. The first scenario has emerged from density-functional theory plus dynamical mean-field (DFT + DMFT) calculations. Comparing the previous DFT DMFT spectra to recent angular-resolved photoemission spectroscopy (ARPES) experiments, we find excellent agreement both Fermi surface and strongly renormalized quasiparticle bands, supporting scenario. Our key findings further suggest that “waterfalls” observed in ARPES might emerge quasiparticle-to-Hubbard-band crossover, additional spectral weight close A pocket likely originates Ni-3dxy orbital. Published by American Physical Society 2024

Language: Английский

Citations

1
Magnetic phase diagram of a two-orbital model for bilayer nickelates with varying doping DOI
Ling-Fang Lin, Yang Zhang, Nitin Kaushal

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(19)

Published: Nov. 18, 2024

Motivated by the discovery of bilayer nickelate superconductor La${}_{3}$Ni${}_{2}$O${}_{7}$, authors investigate here magnetic phase diagrams with varying electronic densities $n$ in a 2\ifmmode\times\else\texttimes\fi{}2\ifmmode\times\else\texttimes\fi{}2 cluster. Rich states are observed, which can be understood three main coupling mechanisms: (1) half-empty ferromagnetic (FM) coupling, (2) half-half antiferromagnetic (AFM) and (3) half-full FM coupling. At half-filling case, mechanism leads to robust (\ensuremath{\pi}, \ensuremath{\pi}, \ensuremath{\pi}) state. For La${}_{3}$Ni${}_{2}$O${}_{7}$ ($n$=1.5) AFM is found strong along $z$ axis, while $x\phantom{\rule{0}{0ex}}y$ plane shows competition between tendencies.

Language: Английский

Citations

1