| 研究生: |
陳正乾 Chen, Cheng-Chien |
|---|---|
| 論文名稱: |
單晶ScSb的物理性質研究 The studies of physical properties of ScSb single crystals |
| 指導教授: |
呂欽山
Lu, Chin-Shan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 物理學系 Department of Physics |
| 論文出版年: | 2021 |
| 畢業學年度: | 109 |
| 語文別: | 中文 |
| 論文頁數: | 58 |
| 中文關鍵詞: | ScSb 、電阻 、熱電 、熱導率 、比熱 、磁化率 、核磁共振 |
| 外文關鍵詞: | ScSb, electrical resistivity, Seebeck coefficient, thermal conductivity, specific heat, magnetic susceptibility, NMR |
| 相關次數: | 點閱:153 下載:1 |
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本篇論文為量測單晶ScSb的電阻、熱電、熱導率、比熱、磁化率和核磁共振來了解其傳輸性質和電子特性,並與其他RX(R=rare earth, X =Sb, Bi, As)系列對比來驗證我們的實驗結果。
我們成功利用助溶劑長晶法合成單晶ScSb,並從XRD和EDS來確認其為單晶,其電阻、熱電、熱導率和RX系列的趨勢相同。另外測量熱電係數得知室溫下其主要傳輸載子為電子。從測量比熱得知有一個微小的態密度N(E<sub>F</sub>)~0.16 states/eV–fu在費米能階附近,並進一步藉由核磁共振估算出Sc的3d電子的貢獻大約為N<sub>d</sub>(E<sub>F</sub>)~0.04states/eV,Sb的5s電子的貢獻大約為N<sub>s</sub>(E<sub>F</sub>)~0.004 states/eV,Sb的5p電子的貢獻大約為N<sub>p</sub>(E<sub>F</sub>)~0.12states/eV,可以估算出ScSb中的Sb的N<sub>p</sub>(E<sub>F</sub>)/N<sub>s</sub> (E<sub>F</sub>)比例約為30,與典型的Sb基金屬相符,從這些測量結果可以證明ScSb具有半金屬特性
We report a study of single crystalline scandium monoantimonide ScSb by means of the electrical resistivity, Seebeck coefficient, thermal conductivity, specific heat, magnetic susceptibility as well as <sup>45</sup>Sc and <sup>121</sup>Sb NMR measurements. The analysis of low-temperature specific heat yields a small Fermi-level density of state (DOS) N(E<sub>F</sub>) = 0.16 states/eV. By analyzing the <sup>45</sup>Sc NMR spin-lattice relaxation rate, we have deduced the partial Sc 3d Fermi-level DOS of about 0.04 states/eV, Sb 5s Fermi-level DOS of about 0.004 states/eV, Sb 5p Fermi-level DOS of about 0.12 states/eV. We can estimate gives the ratio of N<sub>p</sub>(E<sub>F</sub>)/N<sub>s</sub>(E<sub>F</sub>)~30, a realistic value for typical Sb-based metals. With these results, we thus provided convincing evidence for the semi-metallic characteristic in ScSb.
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