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Sökning: WFRF:(Horio Masafumi)

  • Resultat 1-4 av 4
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2.
  • Marques, Carolina A., et al. (författare)
  • Spin-orbit coupling induced Van Hove singularity in proximity to a Lifshitz transition in Sr4Ru3O10
  • 2024
  • Ingår i: npj Quantum Materials. - 2397-4648. ; 9:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Van Hove singularities (VHss) in the vicinity of the Fermi energy often play a dramatic role in the physics of strongly correlated electron materials. The divergence of the density of states generated by VHss can trigger the emergence of phases such as superconductivity, ferromagnetism, metamagnetism, and density wave orders. A detailed understanding of the electronic structure of these VHss is therefore essential for an accurate description of such instabilities. Here, we study the low-energy electronic structure of the trilayer strontium ruthenate Sr4Ru3O10, identifying a rich hierarchy of VHss using angle-resolved photoemission spectroscopy and millikelvin scanning tunneling microscopy. Comparison of k-resolved electron spectroscopy and quasiparticle interference allows us to determine the structure of the VHss and demonstrate the crucial role of spin-orbit coupling in shaping them. We use this to develop a minimal model from which we identify a mechanism for driving a field-induced Lifshitz transition in ferromagnetic metals.
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3.
  • Wang, Qisi, et al. (författare)
  • Charge order lock-in by electron-phonon coupling in La1.675Eu0.25Sr0.125CuO4
  • 2021
  • Ingår i: Science Advances. - : American Association for the Advancement of Science (AAAS). - 2375-2548. ; 7:27
  • Tidskriftsartikel (refereegranskat)abstract
    • Charge order is universal to all hole-doped cuprates. Yet, the driving interactions remain an unsolved problem. Electron-electron interaction is widely believed to be essential, whereas the role of electron-phonon interaction is unclear. We report an ultrahigh-resolution resonant inelastic x-ray scattering (RIXS) study of the in-plane bondstretching phonon mode in stripe-ordered cuprate La1.675Eu0.25Sr0.125CuO4. Phonon softening and lifetime shortening are found around the charge ordering wave vector. In addition to these self-energy effects, the electron-phonon coupling is probed by its proportionality to the RIXS cross section. We find an enhancement of the electron-phonon coupling around the charge-stripe ordering wave vector upon cooling into the low-temperature tetragonal structure phase. These results suggest that, in addition to electronic correlations, electron-phonon coupling contributes substantially to the emergence of long-range charge-stripe order in cuprates.
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4.
  • Wang, Qisi, et al. (författare)
  • Ferromagnetic exchange interaction probed in YFe2Ge2 by resonant inelastic x-ray scattering
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • We report a combined resonant inelastic x-ray scattering and inelastic neutron scattering study of YFe2Ge2. Our data reveal that the A-type magnetic excitations are dominating over the whole energy range suggestive of a ferromagnetic fluctuation mediated p-wave Cooper pairing in this compound. As the magnetic frustration is mediated by conduction electrons which could be highly tunable, for example by doping (pressure), Our results, therefore, suggest the possibility of enhancing Tc in this system.
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  • Resultat 1-4 av 4

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