Investigation of Crystal Properties of Cu0.3:Sb2Se3-xTex by Melting Growth Method
| Autor: | Ming-Hung Tai, 戴銘宏 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Superconductivity has been discovered in Cu doped-topological insulators(TIs), for example, CuxBi2Se3. However, none of papers studied Cu doped Sb2Se3-xTex(x from 0 to 3) whether has superconductivity; therefore, this thesis presented the study of Cu0.3:Sb2Se3-xTex(x from 0 to 3) grown by melting growth method. The crystal structure and the c-axis lattice constant of the samples were confirmed by X-ray Diffraction(XRD) and Transmission Electron Microscopy(TEM) analysis. Qualitative and quantitative analysis were studied by EPMA. The vibration mode of phonons was studied by Raman spectroscopy. X-ray photoelectron spectroscopy(XPS) showed the valence of Cu. Superconducting quantum interference device(SQUID) was used to verify the samples whether have superconductivity or not. The EPMA result showed that crystal has second phase. Moreover, according to XRD and TEM analyzation Cu might intercalated into the Van der Waals layer and caused the c-axis lattice constant increased. However superconductivity doesn’t exist in the crystal. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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