Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(20)
Published: Nov. 12, 2024
Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(11), P. 5020 - 5026
Published: March 5, 2024
The recent discovery of superconductivity in the Ruddlesden–Popper bilayer nickelate, specifically La3Ni2O7, has generated significant interest exploration high-temperature within this material family. In study, we present crystallographic and electrical resistivity properties two distinct nickelates: La3Ni2O7 (referred to as 2222-phase) a previously uncharacterized phase, (1313-phase). 2222-phase is characterized by pseudo F-centered orthorhombic lattice, featuring perovskite [LaNiO3] layers interspaced rock salt [LaO] layers, forming repeated ...2222... sequence. Intriguingly, 1313-phase, which displays semiconducting properties, crystallizes Cmmm space group exhibits pronounced predilection for C-centered lattice. Within structure, exhibit distinctive long-range ordered arrangement, alternating between single- trilayer configurations, resulting ...1313... This report contributes novel insights into crystallography structure–property relationship nickelates, paving way further investigations their unique physical properties.
Language: Английский
Citations
32
Matter and Radiation at Extremes, Journal Year: 2025, Volume and Issue: 10(2)
Published: Jan. 21, 2025
Signatures of superconductivity near 80 K have recently been discovered in single crystals La3Ni2O7 under pressure, which makes it a new candidate for high-temperature superconductors dominated by 3d transition elements, following the cuprate and iron-pnictide superconductors. However, there are several critical questions that perplexing scientific community: (1) What factors contribute to inconsistent reproducibility experimental results? (2) is fundamental nature pressure-induced superconductivity: bulk or nonbulk (filamentary-like)? (3) Where superconducting phase located within sample if filamentary-like? (4) Is oxygen content important development stabilization superconductivity? In this study, we employ comprehensive high-pressure techniques address these questions. Through our modulated ac susceptibility measurements, first find nickelate filamentary-like. Our scanning transmission electron microscopy investigations suggest filamentary-like most likely emerges at interface between La4Ni3O10 phases. By tuning polycrystalline La3Ni2O7, also plays vital role material. The upper lower bounds on 7.35 6.89, respectively. results provide not only insights into puzzling issues regarding material, but significant information will enable better understanding its superconductivity.
Language: Английский
Citations
15
Science Bulletin, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 1, 2025
Language: Английский
Citations
6
Nature Physics, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 17, 2025
Language: Английский
Citations
6
Communications Physics, Journal Year: 2025, Volume and Issue: 8(1)
Published: Feb. 3, 2025
The recent discovery of a superconductivity signature in La3Ni2O7-δ under pressure 14 GPa, with superconducting transition temperature around 80 K, has attracted considerable attention. An important aspect investigating electronic structures is discerning the extent to which ground state resembles parent cuprate superconductor, charge transfer insulator long-range antiferromagnetism. Through X-ray absorption spectroscopy, we reveal influence oxygen ligands on states Ni ions, displaying nature akin but distinct orbital configurations. Additionally, films, detect superlattice reflection (1/4, 1/4, L) at L edge using resonant scattering measurements. Further examination resonance profile indicates that originates from d orbitals. By evaluating reflection's azimuthal angle dependence, confirm presence collinear antiferromagnetic spin ordering and charge-like anisotropy ordered same periodicity. Our findings microscopic relationship between these two components dependence intensity reflection. This investigation enriches our understanding high-temperature high pressure. bilayer nickelates offers new material platform explore superconductivity. In this study, authors identify La3Ni2O7 film ambient revealing critical role ligand existence along anisotropy.
Language: Английский
Citations
3
Physical Review Letters, Journal Year: 2025, Volume and Issue: 134(7)
Published: Feb. 18, 2025
A recent experiment showed the superconducting transition temperature in Ruddlesden-Popper bilayer La_{3}Ni_{2}O_{7} decreases monotonically with increasing pressure above 14 GPa. In order to unravel underlying mechanism for this unusual dependence, we performed theoretical investigations by combining density functional theory (DFT) and unbiased renormalization group (FRG). Our DFT calculations show that Fermi pockets are essentially unchanged (above GPa), but bandwidth is enlarged, particularly interlayer hopping integral between nickel 3d_{3z^{2}-r^{2}} orbitals enhanced. From band structure, construct tight-binding model terms of 3d_{x^{2}-y^{2}} orbitals. On basis, investigate superconductivity induced correlation effects FRG calculations. We find consistently s_{±}-wave pairing triggered spin fluctuations, latter weakened lead a decreasing versus pressure, qualitative agreement experiment. emphasize itinerancy d important captured naturally our calculations, argue dependence would be unnatural, if not impossible, otherwise local-moment picture This sheds light on pertinent microscopic description, more importantly mechanism, La_{3}Ni_{2}O_{7}.
Language: Английский
Citations
3
Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(12)
Published: March 5, 2025
By performing density functional theory plus dynamical mean-field calculations, we systematically investigate the correlated electronic structure in newly discovered monolayer-trilayer (ML-TL) phase of ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ (1313-La327). Our calculated Fermi surfaces are good agreement with result angle-resolved photoemission spectroscopy. We find that 1313-La327 is a multiorbital metal. An orbital-selective Mott behavior found ML our zero- and finite-temperature calculations. The Ni $3{d}_{{z}^{2}}$ orbital exhibits behavior, while $3{d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ metallic due to self-doping. also large static local spin susceptibility Ni, suggesting there fluctuation 1313-La327. TL Ni-${e}_{g}$ orbitals possess correlations similar those ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}$. ${e}_{g}$ outer-layer show non-Fermi liquid behaviors. Besides, weights high-spin states TL-outer implying Hundness. Under 16 GPa, Lifshitz transition revealed by calculations La-related band crosses level. work provides theoretical reference for studying other potential mixed-stacked nickelate superconductors.
Language: Английский
Citations
2
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
Science China Physics Mechanics and Astronomy, Journal Year: 2025, Volume and Issue: 68(4)
Published: Jan. 24, 2025
Language: Английский
Citations
1
Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(18)
Published: Nov. 4, 2024
Recently, evidence of superconductivity (SC) has been reported in pressurized ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}$. Here we study its possible pairing mechanism and symmetry. Through fitting the density-functional-theory band structure, provide a six-orbital tight-binding model. In comparison with structure ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$, additional nonbonding ${d}_{{z}^{2}}$ is important to here. When multiorbital Hubbard interactions are included, our random-phase-approximation based yields an ${s}^{\ifmmode\pm\else\textpm\fi{}}$-wave SC. The dominant Fermi-surface nesting vector ${\mathbf{Q}}_{1}\ensuremath{\approx}(\ensuremath{\pi},\ensuremath{\pi})$ between $\ensuremath{\gamma}$ pocket contributed by bonding top ${\ensuremath{\alpha}}_{1}$ bottom, leading strongest amplitude opposite gap signs within two regimes. real-space interlayer ${d}_{{z}^{2}}$-orbital pairing. This pattern insensitive details. Upon electron doping, ${T}_{c}$ would increase promptly before system enters N\'eel-ordered spin-density-wave phase.
Language: Английский
Citations
7