Browsing by Author "Wu, Shan"

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    Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material BaFe2S3 under pressure
    (American Physical Society, 2018) Zheng, Liangliang; Frandsen, Benjamin A.; Wu, Changwei; Yi, Ming; Wu, Shan; Huang, Qingzhen; Bourret-Courchesne, Edith; Simutis, G.; Khasanov, R.; Yao, Dao-Xin; Wang, Meng; Birgeneau, Robert J.
    We report pressure-dependent neutron diffraction and muon spin relaxation/rotation measurements combined with first-principles calculations to investigate the structural, magnetic, and electronic properties of BaFe2S3 under pressure. The experimental results reveal a gradual enhancement of the stripe-type ordering temperature with increasing pressure up to 2.6 GPa and no observable change in the size of the ordered moment. The ab initio calculations suggest that the magnetism is highly sensitive to the Fe-S bond lengths and angles, clarifying discrepancies with previously published results. In contrast to our experimental observations, the calculations predict a monotonic reduction of the ordered moment with pressure. We suggest that the robustness of the stripe-type antiferromagnetism is due to strong electron correlations not fully considered in the calculations.
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    Modulated magnetism and anomalous electronic transport in Ce3Cu4As4O2
    (American Physical Society, 2016) Wang, Jiakui K.; Wu, Shan; Qiu, Yiming; Rodriguez-Rivera, Jose A.; Huang, Qingzhen; Broholm, C.; Morosan, E.
    The complex magnetism and transport properties of tetragonal Ce3Cu4As4O2 were examined through neutron scattering and physical property measurements on polycrystalline samples. The lamellar structure consists of alternating layers of CeCu4As4 with a single square Ce lattice and Ce2O2 bilayers. Peaks in the specific heat at the Néel temperature TN=24 K, T2=16 K, and T3=1.9 K indicate three magnetic phase transitions or distinct crossover phenomena. For T