arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.09160cond-mat.str-el
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非中心对称U3Ni3Sn4中费米面分裂和重电子态

Splitting Fermi Surfaces and Heavy Electronic States in Non-Centrosymmetric U3Ni3Sn4

Arvind Maurya, Hisatomo Harima, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, DeXin Li, Fuminori Honda, Yoshiki J. Sato, Dai Aoki

摘要:

本文报道了用Bridgman法生长的非中心对称顺磁体U_3Ni_3Sn_4单晶,并用de Haas-van Alphen(dHvA)实验测量了费米面性质。我们还研究了单晶U3 Ni 3Sn 4的单晶X射线衍射,磁化强度,电阻率和热容测量。的dHvA频率的角度依赖性揭示了许多封闭的费米面,这是近球形的拓扑结构。实验结果与局域密度近似(LDA)基于5 f巡游模型的能带结构计算结果吻合较好。能带结构计算预测了许多费米面,大多数是球形的,来自12个带交叉的费米能量。据我们所知,在实验上首次发现了5 f电子系统中由于非中心对称晶体引起的费米面分裂。dHvA振幅的温度依赖性揭示了高达35 m0的大回旋有效质量,这表明由于接近量子临界点而导致U3 Ni 3Sn 4的重电子态。从dHvA振幅的场依赖性,检测到高达1950 A的传导电子的平均自由程,反映了生长的晶体的良好质量。与反对称自旋-轨道相互作用有关的小分裂能量很可能是由于大的回旋有效质量。

英文摘要:

We report the single-crystal growth of the non-centrosymmetric paramagnet U3Ni3Sn4 by the Bridgman method and the Fermi surface properties detected by de Haas-van Alphen (dHvA) experiments. We have also investigated single-crystal U3Ni3Sn4 by single-crystal X-ray diffraction, magnetization, electrical resistivity, and heat capacity measurements. The angular dependence of the dHvA frequencies reveals many closed Fermi surfaces, which are nearly spherical in topology. The experimental results are in good agreement with local density approximation (LDA) band structure calculations based on the 5f-itinerant model. The band structure calculation predicts many Fermi surfaces, mostly with spherical shape, derived from 12 bands crossing the Fermi energy. To our knowledge, the splitting of Fermi surfaces due to the non-centrosymmetric crystal in 5f-electron systems is experimentally detected for the first time. The temperature dependence of the dHvA amplitude reveals a large cyclotron effective mass of up to 35m0, indicating the heavy electronic state of U3Ni3Sn4 due to the proximity of the quantum critical point. From the field dependence of the dHvA amplitude, a mean free path of conduction electrons of up to 1950A is detected, reflecting the good quality of the grown crystal. The small splitting energy related to the antisymmetric spin-orbit interaction is most likely due to the large cyclotron effective mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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