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Electronic structure of superconducting infinite-layer lanthanum nickelates.
Sci Adv
January 2025
National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.
Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this class of unconventional superconductors but has been hindered by the formidable challenges in improving the sample quality. In this work, we report the angle-resolved photoemission spectroscopy of superconducting LaSrNiO films prepared by molecular beam epitaxy and in situ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni [Formula: see text]-derived Fermi sheet that evolves from hole-like to electron-like along and a three-dimensional (3D) electron pocket centered at the Brillouin zone corner.
View Article and Find Full Text PDFUltrahigh piezoelectric performances of (K,Na)NbO based ceramics enabled by structural flexibility and grain orientation.
Nat Commun
January 2025
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China.
(K,Na)NbO-based ceramics are deemed among the most promising lead-free piezoelectric materials, though their overall piezoelectric performance still lags behind the mainstream lead-containing counterparts. Here, we achieve an ultrahigh piezoelectric charge coefficient d ∼ 807 pC·N, along with a high longitudinal electromechanical coupling factor (k ∼ 88%) and Curie temperature (T ∼ 245 °C) in the (K,Na)(NbSb)O-BiNaZrO-BiFeO (KNN-xSb) system through structural flexibility and grain orientation strategies. Phenomenological models, phase field simulations and high-angle annular dark-field scanning transmission electron microscopy reveal that the structural flexibility originates from the high Coulomb force between K/Na ions and Sb ions in the KNN-xSb system, while the grain orientation promotes the displacement of B-site cations leveraging the engineered domain configuration.
View Article and Find Full Text PDFHigh-entropy engineered BaTiO-based ceramic capacitors with greatly enhanced high-temperature energy storage performance.
Nat Commun
January 2025
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China.
Ceramic capacitors with ultrahigh power density are crucial in modern electrical applications, especially under high-temperature conditions. However, the relatively low energy density limits their application scope and hinders device miniaturization and integration. In this work, we present a high-entropy BaTiO-based relaxor ceramic with outstanding energy storage properties, achieving a substantial recoverable energy density of 10.
View Article and Find Full Text PDFStripe charge order and its interaction with Majorana bound states in 2M-WS topological superconductors.
Natl Sci Rev
February 2025
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
To achieve logic operations via Majorana braiding, positional control of the Majorana bound states (MBSs) must be established. Here we report the observation of a striped surface charge order coexisting with superconductivity and its interaction with the MBS in the topological superconductor 2M-WS, using low-temperature scanning tunneling microscopy. By applying an out-of-plane magnetic field, we observe that MBSs are absent in vortices in the region with stripe order.
View Article and Find Full Text PDFOptimizing the growth conditions of superconducting MoSi thin films for single photon detection.
Sci Rep
January 2025
Walter Schottky Institute, Technical University of Munich, 85748, Garching, Germany.
We investigate the growth of amorphous MoSi thin films using magnetron co-sputtering and optimize the growth conditions with respect to crystal structure and superconducting properties (e.g., critical temperature [Formula: see text]).
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