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Award ID contains: 1832031

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  1. (, Physical review)
    Topological magnetism typically appears in noncentrosymmetric compounds or compounds with geometric frustration. Here, we report the effective tuning of magnetism in centrosymmetric tetragonal Mn2−xZnxSb by Zn substitution. The magnetism is found to be closely coupled to the transport properties, giving rise to a very large topological Hall effect with fine-tuning of Zn content, which even persists to high temperature (∼250K). The further magnetoentropic analysis suggests that the topological Hall effect is possibly associated with topological magnetism. Our finding suggests Mn2−xZnxSb is a candidate material for a centrosymmetric tetragonal topological magnetic system, offering opportunities for studying and tuning spin textures and developing near room temperature spin-based devices. 
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    Accepted Manuscript Full Text Available
  2. (, Physical review)
    We have investigated the magnetic structure of Li2Co(WO4)2 via magnetic susceptibility, and neutron diffraction measurements. Two magnetic transitions are observed in magnetic susceptibility at TN1∼9.5K and TN2∼7.2K. Neutron diffraction reveals an incommensurate magnetic order with a wave vector kICM=(∼0.46,∼0.27,∼0.24) between TN1 and TN2 and a commensurate magnetic order with a wave vector kCM=(0.5,0.25,0.25) below TN2. The magnetic periodicity in the commensurate phase is four times larger than the nuclear unit cell length along the b- and c-axis directions with a saturated magnetic moment equal to ≈2.92μB. Below TN1, the ICM wave vector for Li2Co(WO4)2 varies with decreasing temperature and locked into commensurate at TN2, whereas weaker temperature dependence of kICM=(0.46,0.17,0.33) is observed for Li2Ni(WO4)2. 
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    Accepted Manuscript Full Text Available