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Creators/Authors contains: "Shu, Zhixue"

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  1. ; ; (, Journal of Physics: Condensed Matter)
    Abstract Fe 3 + δ GeTe 2 (FGT) has proved to be an interesting van der Waals (vdW) ferromagnetic compound with a tunable Curie temperature ( T C ). However, the underlying mechanism for varying T C remains elusive. Here, we systematically investigate and compare low-temperature magnetic properties of single crystalline FGT samples that exhibit T C s ranging from 160 K to 205 K. Spin stiffness (D) and spin excitation gap (Δ) are extracted using Bloch’s theory for crystals with varying Fe content. Compared to Cr-based vdW ferromagnets, FGT compounds have higher spin stiffness values but lower spin wave excitation gaps. We discuss the implication of these relationships in Fe–Fe ion magnetic interactions in FGT unit cells. The itinerancy of magnetic electrons is measured and discussed under the Rhodes–Wohlfarth ratio (RWR) and the Takahashi theory. 
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  2. ; ; ; ; ; (, Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials)
    A new compound, Ba 3 Ga 2 O 5 Cl 2 , isostructural with Ba 3 Fe 2 O 5 Cl 2 , was synthesized by solid-state reaction in air. Through single-crystal and powder X-ray diffraction analysis, the crystal structure was determined to be cubic with chiral space group I 2 1 3 and unit-cell parameter a  = 9.928 (1) Å. The Ga 3+ ions in Ba 3 Ga 2 O 5 Cl 2 are coordinated by O atoms and form GaO 4 tetrahedra. Ten neighboring GaO 4 tetrahedra are further bridged through corner sharing and rotation along the body diagonal, producing the chiral structure. Magnetization measurements indicate temperature-independent diamagnetic behavior, which is qualitatively consistent with core diamagnetism from all the constituent elements. 
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  3. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review B)
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  4. ; ; ; ; ; ; (, Inorganic Chemistry)
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