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Spin-Density Wave, Unconventional Magnetic and Thermal Transport Properties in Sr(PbCl)Cu(BO).
Materials (Basel)
December 2024
Department of Applied Physics, Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea.
SrCu(BO) (Sr-122) has attracted considerable interest as a quasi-two-dimensional S = 1/2 Heisenberg antiferromagnetic spin system with a Shastry-Sutherland lattice (SSL) structure. It features a Cu spin dimer ground state and exhibits intra-dimer Dzyaloshinskii-Moriya interactions, making Sr-122 a fascinating platform for studying quantum magnetic phenomena. In this study, we investigate the β-phase of SrCu(BO) (β-Sr-212), which retains the same spin structure as Sr-122, to explore how the carrier concentration affects the spin gap.
View Article and Find Full Text PDFMagnetic stability, Fermi surface topology, and spin-correlated dielectric response in monolayer 1T-CrTe.
Phys Chem Chem Phys
November 2024
Department of Physics, Astronomy, and Geosciences, Towson University, 8000 York Road, Towson, MD 21252, USA.
We have carried out density-functional theory (DFT) calculations to study the magnetic stability of both ferromagnetic (FM) and anti-ferromagnetic (AFM) states in monolayer 1T-CrTe. Our results show that the AFM order is lower in energy and thus is the ground state. By tuning the lattice parameters, the AFM order can transition to the FM order, in good agreement with experimental observation.
View Article and Find Full Text PDFElectronic and magnetic excitations in LaNiO.
Nat Commun
November 2024
National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, China.
High-temperature superconductivity was discovered in the pressurized nickelate LaNiO which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundamental interactions and bosons mediating superconducting pairing. Here, using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we identified that Ni 3 , Ni 3 , and ligand oxygen 2p orbitals dominate the low-energy physics with a small charge-transfer energy.
View Article and Find Full Text PDFSuperconductivity under pressure in a chromium-based kagome metal.
Nature
August 2024
School of Physics, Zhejiang University, Hangzhou, China.
Article Synopsis
- The text discusses the theoretical and experimental challenges of achieving superconductivity in kagome materials, particularly highlighting nonmagnetic vanadium-based variants that do not support the expected exotic superconductivity.
- A new chromium-based kagome metal, CsCrSb, is introduced, characterized by strong electron correlations, frustrated magnetism, and flat bands near the Fermi level.
- This material undergoes a phase transition at 55 K, with density-wave orders evolving under pressure, leading to the emergence of superconductivity between 3.65-8.0 GPa, peaking at 6.4 K when these orders are suppressed, suggesting connections to unconventional superconductivity.
Interaction-Driven Quasi-Insulating Ground States of Gapped Electron-Doped Bilayer Graphene.
Phys Rev Lett
August 2024
1st Physical Institute, Faculty of Physics, University of Göttingen, Friedrich-Hund-Platz 1, Göttingen 37077, Germany.
Bernal bilayer graphene has recently been discovered to exhibit a wide range of unique ordered phases resulting from interaction-driven effects and encompassing spin and valley magnetism, correlated insulators, correlated metals, and superconductivity. This Letter reports on a novel family of correlated phases characterized by spin and valley ordering, distinct from those reported previously. These phases emerge in electron-doped bilayer graphene where the energy bands are exceptionally flat, manifested through an intriguing nonlinear current-bias behavior that occurs at the onset of the phases and is accompanied by an insulating temperature dependence.
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