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2 linked papers

1 linked paper

2 linked papers

2 linked papers

1 linked paper

2 linked papers

3 linked papers

This study employs ¹³⁹La nuclear quadrupole resonance (NQR) spectroscopy to systematically investigate the density-wave order in single-crystalline La₄Ni₃O₁₀ under ambient pressure and 2.3 GPa hydrostatic pressure. The results show that the spin density wave and charge density wave in this material are intertwined, distinctly different from La₃Ni₂O₇; short-range density-wave order emerges around 150 K and develops into long-range density-wave order around 139 K. Upon applying pressure, the transition temperatures of the short-range and long-range density-wave orders decrease at rates of approximately 1 K/GPa and 10 K/GPa, respectively, indicating that the long-range order is suppressed more rapidly by pressure. On this basis, the authors propose that both the spin density wave and charge density wave in La₄Ni₃O₁₀ are competing orders of the superconducting state, providing new clues for understanding the interplay between density-wave order and unconventional superconductivity.

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By measuring quantum corrections to the magnetoconductance in single-crystal trilayer Ruddlesden-Popper nickelates Pr4Ni3O10 and La4Ni3O10, this study investigates their transport dimensionality, phase coherence, and scattering mechanisms. At low temperatures, negative magnetoresistance and two-dimensional weak localization (WL) signatures are observed, and the magnetoresistance scales with the perpendicular field component as a function of magnetic field orientation, indicating that in-plane electronic transport lies in the quantum diffusive regime, whereas out-of-plane transport is incoherent, with the electronic ground state being a quasi-two-dimensional disordered Fermi liquid. Despite the high atomic numbers of La/Pr and the magnetism of Ni/Pr, WL remains relatively robust, which arises from the partial cancellation of spin-orbit scattering and spin-flip scattering, as well as the spatial isolation of rare-earth ions from the NiO2 layers. Pressurizing to 3 GPa continuously suppresses the WL features, possibly indicating a two-dimensional/three-dimensional dimensional crossover and establishing a link between the ambient-pressure normal state and the pressure-induced superconducting state.