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Magnetism variation of the compressed antiferromagnetic topological insulator EuSn_(2)As_(2)
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作者 Hualei Sun Cuiqun Chen +10 位作者 Yusheng Hou Weiliang Wang Yu Gong Mengwu Huo Lisi Li Jia Yu Wanping Cai naitian liu Ruqian Wu Dao-Xin Yao Meng Wang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2021年第11期133-140,共8页
We report a comprehensive high-pressure study,up to 21.1 GPa,on the antiferromagnetic topological insulator EuSn_(2)As_(2) achieved through synchrotron X-ray diffraction,Raman scattering,electrical resistance,magnetic... We report a comprehensive high-pressure study,up to 21.1 GPa,on the antiferromagnetic topological insulator EuSn_(2)As_(2) achieved through synchrotron X-ray diffraction,Raman scattering,electrical resistance,magnetic resistance,and Hall transport measurements in combination with first-principles calculations.The Néel temperatures determined from resistance are increased from(24±1)to(77±8)K under pressure,which is a result of enhanced magnetic exchange couplings between Eu^(2+) ions yielded by our first-principles calculations.The negative magnetoresistance of EuSn_(2)As_(2) persists to higher temperatures accordingly.However,the enhancement of the observed Néel temperatures deviates from the calculations above 10.0 GPa.In addition,the magnitude of the magnetoresistance,Hall coefficients,and charge carrier densities show abrupt changes between 6.9 and 10.0 GPa.The abrupt changes likely originate from a pressure-induced valence change of Eu ions from a divalent state to a divalent and trivalent mixed state or are related to the structural transition revealed by Raman scattering measurements.Our results provide insight into magnetism variation in EuSn_(2)As_(2) and similar antiferromagnetic topological insulators under pressure. 展开更多
关键词 ANTIFERROMAGNETISM TOPOLOGICAL INSULATOR high pressure
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