Physical Properties of Iron-based FeSe Superconductor Under High-pressure

• Main Author: 唐赫
• Other Authors: Chih-Ming Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/59201515742862748712

碩士 === 國立新竹教育大學 === 應用科學系碩士班 === 100 === 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.