研究生: |
唐赫 |
---|---|
論文名稱: |
高壓下硒化鐵超導體物理性質研究 Physical Properties of Iron-based FeSe Superconductor Under High-pressure |
指導教授: |
林志明
Chih-Ming Lin |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
|
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 94 |
中文關鍵詞: | 高壓 、鐵基超導體 、拉曼 |
外文關鍵詞: | High-pressure, Iron-based Superconductor, Raman |
相關次數: | 點閱:3 下載:0 |
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本論文利用拉曼光譜,探討FeSex(x=1、0.88)、CuxFe1-xSe(x=0.01、0.02)與MnxFe1-xSe(x=0.01、0.03、0.05)高壓下的物理性質。在類靜水壓環境中對實驗樣品加壓,升壓過程中樣品產生晶格不穩定的狀態,Fe B1g振動模會有一驟降現象。與FeSe比較,摻雜銅與錳的FeSe分別受摻雜原子取代鐵原子的影響,致使驟降現象之壓力提前。Fe B1g振動模是鐵離子平行於Z軸方向振動,Fe Eg振動模是鐵離子平行於X-Y軸方向振動,在驟降發生前,隨著壓力增加Fe B1g振動模與Fe Eg振動模會緩慢往低頻移動,表示鐵離子之間距離隨壓力增加而變大。此外,Cu0.02Fe0.98Se Fe B1g振動模在驟降發生時有分裂的現象,和Cu0.02Fe0.98Se不具超導性質有關,Fe B1g振動模在驟降發生時分裂與否,能幫助區分鐵硒材料是否有具有超導特性。
Raman spectroscopy has been made on FeSex(x=1, 0.88), CuxFe1-xSe(x=0.01, 0.02)and MnxFe1-xSe(x=0.01, 0.03, 0.05)under high pressure. By increasing external pressure at quasi-hydrostatic condition, structural distortion occur and vibration of FeB1g will outcome descend phenomenon. Compared with FeSe, copper and manganese-doped FeSe will replace iron, resulting early descend phenomenon. Vibration mode of FeB1g and FeEg will slowly shift towards low frequency, therefore the distance between iron ion will increase along with the pressure. In addition, vibration mode of Cu0.02Fe0.98Se Fe B1g will produce a split when descend phenomenon happened therefore is not a superconductor. By knowing whether vibration of FeSe at descend phenomenon will produce split or not, could assist on distinguish whether it contain a superconductivity property or not.
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