Publications

Showing 35 results for Author: Yan Wu

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  • Sep, 2026

    Journal

    Model-free detection of physical order from scattering and imaging data using escort-weighted Shannon entropy and divergence matrices

    We demonstrate a model-free data analysis framework that leverages escort-weighted Shannon entropy and several divergence matrices to detect phase transitions in scattering and imaging datasets. By establishing a connection between physical entropy and informational entropy, this approach provides a sensitive method for identifying phase transitions without a physical mode…

  • Jul, 2026

    Journal

    Small Co-doping induced magnetic and electrical transitions in single crystal CaF⁢e0.95⁢C⁢o0.05⁢O3

    CaFe⁢O3 and CaF⁢e0.95⁢C⁢o0.05⁢O3 single crystals were grown by combing floating-zone method with high oxygen pressure treatment. Both crystals show charge disproportionation of Fe (F⁡e4+→F⁡e3++F⁡e5+) accompanied by a metal-to-insulator transition as well as a crystal structural transformation from Pbnm to 𝑃⁢21/𝑛. However, the slight introduction of Co significantly suppres…

  • Jan, 2026

    Journal

    MnSi2Te4: A van der Waals Antiferromagnetic Semiconductor with Large Negative Magnetoresistance

    Magnetism in van der Waals semiconductors offers significant potential for fundamental research on low-dimensional magnetism and the development of high-performance two-dimensional spintronic devices. Here, we report the growth, physical properties, and first-principles calculations of a new dual-octahedral transition metal chalcogenide (DTMC) MnSi2Te4. MnSi2Te4 features a…

  • Jan, 2026

    Journal

    Large Anomalous and Topological Hall Effect and Nernst Effect in a Dirac Kagome Magnet Fe3Ge

    Searching for Kagome magnets with novel magnetic and electronic properties has been attracting significant efforts recently. Here, the magnetic, electronic, and thermoelectric properties of Fe3Ge single crystals with Fe atoms forming a slightly distorted Kagome lattice are reported. It is shown that Fe3Ge exhibits a large anomalous Hall effect and anomalous Nernst effect.…

  • Oct, 2025

    Journal

    Spin-flop-like transition as quantum critical point in Cs2⁢RuO4

    We report thermodynamic, neutron diffraction, and inelastic neutron scattering measurements on Cs2⁢RuO4, a member of the celebrated family of frustrated magnets Cs2⁢𝑀⁢𝑋4 (𝑀 = Cu, Co, 𝑋 = Br, Cl). Unlike the previously studied members, it is based on 4⁢𝑑 transition metal ions with 𝑆=1. Mapping out the 𝐻−𝑇 magnetic phase diagram reveals an unusual continuous spin-flop-like p…

  • Oct, 2025

    Journal

    High-pressure neutron diffraction at ultra-low temperature

    Neutron diffraction is a powerful tool in the study of quantum materials and associated emergent phenomena as it allows for direct detection of magnetic structure even at ultra-low temperatures. As pressure can drive systems across quantum critical points and tune emergent behaviors at the quantum scale, coupling neutron diffraction with extreme conditions of high pressure…

  • Aug, 2025

    Journal

    Symmetrization of Strong Hydrogen Bond under High Pressure in Bihydroxide-Ion-Containing NaCu2(SO4)2·H3O2 Revealed by Experimental Charge Density, Single-Crystal Electron Diffraction, and Neutron Diffraction Studies

    In minerals and inorganic compounds, strong hydrogen bonding can lead to the formation of complex ionic species such as the H3O2– bihydroxide anion and Zundel cation H5O2+. We studied [NaCu2(SO4)2·H3O2] natrochalcite, which contains bihydroxide anions and undergoes hydrogen bond symmetrization at the lowest pressure reported so far among inorganic compounds. Hydrogen bond…

  • Jul, 2025

    Journal

    Pressure tuning of Kitaev spin liquid candidate Na3Co2SbO6

    The search for Kitaev’s quantum spin liquid in real materials has recently expanded with the prediction that honeycomb lattices of divalent, high-spin cobalt ions could host the dominant bond-dependent exchange interactions required to stabilize the elusive entangled quantum state. The layered honeycomb Na3Co2SbO6 has been singled out as a leading candidate provided that t…

  • Jun, 2025

    Journal

    Magnetic Properties Tuning via Broad Range Site Deficiency in Square Net Material UCuxBi2

    HfCuSi2-type pnictogen compounds have recently been shown to be a versatile platform for designing materials with topologically nontrivial band structures. However, these phases require strict control over the electron count to tune the Fermi level, which can only be achieved in compositions with A2+M2+Pn2 and A3+M+Pn2 (A = lanthanides, M = transition metals, Pn = pnictoge…

  • Apr, 2025

    Journal

    Spin Waves in Dirac Semimetal Ca0.6⁢Sr0.4⁢MnSb2 Investigated with Neutrons by the Diffraction Method

    The tunability of Dirac semimetals with antiferromagnetic Mn layers is of great interest. The observed sign change of interlayer magnetic coupling between CaMnBi2 and SrMnBi2 suggests ionic substitution as a potential tuning mechanism. If so, novel behavior near the compensation point could be expected. To explore this, we study a mixed-cation analog, Ca0.6Sr0.4MnSb2, wher…

  • Apr, 2025

    Journal

    Structural and magnetic properties of CoTeMo⁢O6

    We have conducted a comprehensive investigation into the magnetic properties of the chiral multiferroic material CoTeMo⁢O6. In contrast with the previous claim of canted antiferromagnetic order with ferromagnetic components [Y. Doi et al., J. Solid State Chem. 182, 3232 (2009)], our investigation reveals an antiferromagnetic ground state with compensated moments, providing…

  • Mar, 2025

    Journal

    Electromagnon Signatures of a Metastable Multiferroic State

    Magnetoelectric multiferroic materials, particularly type-II multiferroics where ferroelectric polarizations arise from magnetic order, offer significant potential for the simultaneous control of magnetic and electric properties. However, it remains an open question as to how the multiferroic ground states are stabilized on the free-energy landscape in the presence of intr…

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