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Showing 1–10 of 10 results
Advanced filters: Author: Valentina Bisogni Clear advanced filters

  • The authors study epitaxial thin films of the pyrochlore-sublattice compound LiTi2O4 by RIXS and ARPES. They observe cooperation between strong electron correlations and strong electron-phonon coupling, giving rise to a mobile polaronic ground state in which charge motion and lattice distortions are coupled.

    • Zubia Hasan
    • Grace A. Pan
    • Julia A. Mundy
    ResearchOpen Access
    Nature Communications
    Volume: 17, P: 1-9

  • Rare-earth perovskite nickelates show intriguing metal–insulator transitions, whose mechanism remains elusive. Here, Bisogni et al. evidenced a 3d8 Ni configuration together with abundance of oxygen 2p holes in the ground state of a NdNiO3thin film, suggesting a negative charge-transfer scenario.

    • Valentina Bisogni
    • Sara Catalano
    • Thorsten Schmitt
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-8

  • Experimental evidence for charge coupling to ferroelectric soft mode is scarce. Here, the authors find a photogenerated coherent phonon coupling to the electronic transition above the bandgap in the van der Waals ferroelectric semiconductor NbOI2.

    • Chun-Ying Huang
    • Daniel G. Chica
    • Xiaoyang Zhu
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-9

  • The thickness dependence of the dispersion of spin waves in mesoscopic iron films is measured and found to be renormalized in the out-of-plane direction as the thickness is reduced. The results are captured by a Heisenberg model that accounts for the confinement in the out-of-plane direction through the loss of Fe bonds.

    • Jonathan Pelliciari
    • Sangjae Lee
    • Valentina Bisogni
    Research
    Nature Materials
    Volume: 20, P: 188-193

  • Combining resonant inelastic X-ray scattering and photoluminescence spectroscopy, an elementary excitation in hexagonal-boron-nitride-based single-photon emitters has been demonstrated, giving rise to multiple regular harmonics that can explain the wide frequency range of these emitters.

    • Jonathan Pelliciari
    • Enrique Mejia
    • Gabriele Grosso
    Research
    Nature Materials
    Volume: 23, P: 1230-1236

  • Nickelates have been shown to host unconventional superconductivity, and recently it has been found that the choice of substrate can significantly change the superconducting critical temperature. This suggests, that like some Cuprates, strain could be important. Here Gao, Fan, Wang, and coauthors find that magnetic excitations in a parent Nickelate are insensitive to substrate choice, and therefore strain, which differs markedly from the case of Cuprates.

    • Qiang Gao
    • Shiyu Fan
    • Zhihai Zhu
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-7

  • In transition metal oxides, an insulating band gap is found when the energy scales related to ionic charge excitations dominate over electronic itinerancy. Here, the authors demonstrate strong electron-phonon interactions in Li2CuO2and their effect on the insulating band gap.

    • Steve Johnston
    • Claude Monney
    • Jeroen van den Brink
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-7

  • The complex interactions in spin spiral systems play an important role for the emergence of multiferroicity and topological magnetic order. Here, the authors investigate the magnetism associated with the two inequivalent Cu positions in the model system Cu2OSeO3, observing site-specific electronic structure and associated magnetic excitations.

    • Yanhong Gu
    • Yilin Wang
    • Valentina Bisogni
    ResearchOpen Access
    Communications Physics
    Volume: 5, P: 1-7

  • Understanding the connection between qubit coherence and microscopic materials properties is vital for improving device performance. Here, the relaxation times of superconducting transmon qubits are found to be directly correlated with Nb film properties such as grain size and surface oxide composition.

    • Anjali Premkumar
    • Conan Weiland
    • Ignace Jarrige
    ResearchOpen Access
    Communications Materials
    Volume: 2, P: 1-9