Publications by authors named "Mengwu Huo"
The discovery of superconductivity with a critical temperature of about 80 K in LaNiO single crystals under pressure has received enormous attention. LaNiO is not superconducting under ambient pressure but exhibits a transition at T ≃ 115 K. Understanding the electronic correlations and charge dynamics is an important step towards the origin of superconductivity and other instabilities.
View Article and Find Full Text PDFAfter several decades of studies of high-temperature superconductivity, there is no compelling theory for the mechanism yet; however, the spin fluctuations have been widely believed to play a crucial role in forming the superconducting Cooper pairs. The recent discovery of high-temperature superconductivity near 80 K in the bilayer nickelate LaNiO under pressure provides a new platform to elucidate the origins of high-temperature superconductivity. We perform elastic and inelastic neutron scattering studies on a polycrystalline sample of LaNiO at ambient pressure.
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- Recent findings show that LaNiO exhibits superconductivity under high pressure at around 80K, sparking research into its pairing mechanism and atomic structures.
- A new electron ptychography technique combined with electron energy-loss spectroscopy has been developed to study this material, allowing for the direct visualization of oxygen vacancies, which are critical for superconductivity.
- The results indicate significant inhomogeneity in oxygen content, with specific holes affecting superconductivity, and highlight the potential of this imaging technique for further research in materials science.
The latest discovery of high temperature superconductivity near 80 K in LaNiO under high pressure has attracted much attention. Many proposals are put forth to understand the origin of superconductivity. The determination of electronic structures is a prerequisite to establish theories to understand superconductivity in nickelates but is still lacking.
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- Researchers have found signs of superconductivity in LaNiO single crystals at high pressures, achieving a maximum temperature (T) of 80 K, which is above the liquid-nitrogen boiling point.
- The studied superconducting phase has an orthorhombic structure and involves strong mixing of nickel cation orbitals with oxygen orbitals.
- Density functional theory calculations suggest that superconductivity in this material is linked to changes in electronic structure as it transitions to a metallic state, offering new insights into high-temperature superconductivity.