【摘 要】
：
We report a comprehensive high-pressure study,up to 21.1 GPa,on the antiferromagnetic topological insulator EuSn2As2 achieved through synchrotron X-ray diffraction,Raman scattering,electrical resistance,magnetic resistance,and Hall transport measurements
【机 构】
：
Center for Neutron Science and Technology,School of Physics,Sun Yat-Sen University,Guangzhou 510275,
【出 处】
：
中国科学：物理学 力学 天文学（英文版）
论文部分内容阅读
We report a comprehensive high-pressure study,up to 21.1 GPa,on the antiferromagnetic topological insulator EuSn2As2 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 Eu2+ ions yielded by our first-principles calculations.The negative magnetoresistance of EuSn2As2 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 EuSn2As2 and similar antiferromagnetic topological insulators under pressure.
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