Structure and pressure dependence of the Fermi surface of lithium
Structure and pressure dependence of the Fermi surface of lithium
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DOI：
10.1103/physrevb.106.l041112
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发表时间：
2022-07
影响因子：
3.7
通讯作者：
Tushar Bhowmick;S. Elatresh;A. Grockowiak;W. Coniglio;M. T. Hossain;E. Nicol;S. Tozer;S. Bonev;S. Deemyad
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文献类型：
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作者：
Tushar Bhowmick;S. Elatresh;A. Grockowiak;W. Coniglio;M. T. Hossain;E. Nicol;S. Tozer;S. Bonev;S. Deemyad
我们报告了从环境压力到 4.7 GPa 的同位素纯多晶的费米面 (FS) 的研究。测量在高达 35 T 的外部磁场中 300 mK 的 Shubnikov–de Haas (SdH) 振荡，以绘制锂 FS 的球形部分。我们的环境压力数据表明，主要的 SdH 频率由 、 和 处的三个不同峰值组成，这在理论上与表现出近球形 FS 的两个晶体结构域的存在一致。 FS 球形部分的尺寸与 bcc 和 fcc 晶体结构兼容。 41.25 和 42.65 kT 处的测量频率为 fcc Li 中 FS 的球形变形提供了直接的定量证据。我们的高压数据表明，虽然 Li 的 FS 在压缩下变形，但在高达 4.7 GPa 的压力下，它大部分仍保持球形，并且 SdH 频率的压力依赖性与 fcc 结构中理论计算的压力依赖性一致。最后，我们发现电子有效质量在压力下不会显着偏离其环境压力值。
We report studies of the Fermi surface (FS) of isotopically pure polycrystallinefrom ambient pressure to 4.7 GPa. Shubnikov–de Haas (SdH) oscillations at 300 mK in external magnetic fields up to 35 T are measured to map the spherical parts of the FS of lithium. Our ambient pressure data show that the principal SdH frequencies consist of three distinct peaks at, and, which are theoretically consistent with the presence of two crystal structure domains exhibiting nearly spherical FS. The size of the spherical parts of the FS is compatible with bcc and fcc crystal structures. The measured frequencies at 41.25 and 42.65 kT present direct quantitative evidence for the spherical deformation of the FS in fcc Li. Our high-pressure data show that while the FS of Li deforms under compression, it remains mostly spherical up to 4.7 GPa and the pressure dependence of the SdH frequency is consistent with the theoretically calculated pressure dependence in the fcc structure. Finally, we find that the electron effective mass does not deviate under pressure significantly from its ambient pressure value.