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Spin Magnetic Effect Activate Dual Site Intramolecular O─O Bridging for Nickel-Iron Hydroxide Enhanced Oxygen Evolution Catalysis.
Adv Sci (Weinh)
January 2025
Institution Faculty of Arts and Sciences & Center for Advanced Materials Research, Beijing Normal University, Zhuhai, 519087, China.
The oxygen evolution reaction (OER) involves the recombination of diamagnetic hydroxyl (OH) or water (HO) into the paramagnetic triplet state of oxygen (O). The spin conservation of oxygen intermediates plays a crucial role in OER, however, research on spin dynamics during the catalytic process remains in its early stages. Herein, β-Ni(OH) and Fe-doped β-Ni(OH) (NiFe(OH)) are utilized as model catalysts to understand the mechanism of spin magnetic effects at iron (III) sites during OER.
View Article and Find Full Text PDFCombined Experimental and Theoretical Approach to the Electronic and Magnetic Properties of Cu-Doped LaMnO Perovskites.
J Phys Chem C Nanomater Interfaces
January 2025
Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck,Innrain 80-82, 6020 Innsbruck, Austria.
Cu-doped LaCu Mn O perovskites have been used as a model system for a joint experimental and theoretical assessment of the influence of the Cu doping level on the structural, electronic, and magnetic properties. The different Cu-doped phases LaCuMnO (LCM37), LaCuMnO (LCM55), and LaCuMnO (LCM73) including the respective Cu- and Mn-free benchmark materials LaCuO (LC) and LaMnO (LM) have been studied by magnetization measurements and electronic paramagnetic resonance. Ferromagnetic behavior was detected for pure LM and all Cu-doped perovskites, whereas antiferromagnetic behavior was revealed for LaCuO.
View Article and Find Full Text PDFElectronic and magnetic properties of GeP monolayer modulated by Ge vacancies and doping with Mn and Fe transition metals.
RSC Adv
January 2025
Institute of Theoretical and Applied Research, Duy Tan University Ha Noi 100000 Vietnam
In this work, Ge vacancies and doping with transition metals (Mn and Fe) are proposed to modulate the electronic and magnetic properties of GeP monolayers. A pristine GeP monolayer is a non-magnetic two-dimensional (2D) material, exhibiting indirect gap semiconductor behavior with an energy gap of 1.34(2.
View Article and Find Full Text PDFPhase transitions, Dirac and Weyl semimetal states in MnGeBiTe.
Sci Rep
January 2025
Saint Petersburg State University, St. Petersburg, 198504, Russia.
Using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), an experimental and theoretical study of changes in the electronic structure (dispersion dependencies) and corresponding modification of the energy band gap at the Dirac point (DP) for topological insulator (TI) [Formula: see text] have been carried out with gradual replacement of magnetic Mn atoms by non-magnetic Ge atoms when concentration of the latter was varied from 10% to 75%. It was shown that when Ge concentration increases, the bulk band gap decreases and reaches zero plateau in the concentration range of 45-60% while trivial surface states (TrSS) are present and exhibit an energy splitting of 100 and 70 meV in different types of measurements. It was also shown that TSS disappear from the measured band dispersions at a Ge concentration of about 40%.
View Article and Find Full Text PDFPseudogap in electron-doped cuprates: Strong correlation leading to band splitting.
Proc Natl Acad Sci U S A
January 2025
Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
The pseudogap phenomena have been a long-standing mystery of the cuprate high-temperature superconductors. The pseudogap in the electron-doped cuprates has been attributed to band folding due to antiferromagnetic (AFM) long-range order or short-range correlation. We performed an angle-resolved photoemission spectroscopy study of the electron-doped cuprates PrLaCeCuO showing spin-glass, disordered AFM behaviors, and superconductivity at low temperatures and, by measurements with fine momentum cuts, found that the gap opens on the unfolded Fermi surface rather than the AFM Brillouin zone boundary.
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