Low and High-temperature electical transport properties of Al- Pd-(Re,Fe) quasicrystals

• Main Authors: Yeh, Ping-Chun, 葉秉君
• Other Authors: Shui-Tien Lin
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/26397372005059748760

碩士 === 國立成功大學 === 物理學系 === 86 === Low and high-temperature electrical transport properties of Al-Pd-(Re,Fe) quasicrystals Student: Ping-Chun Yeh Advisor: Shui-Tien Lin Department of Physics﹐National Cheng Kung University﹐ Tainan﹐Taiwan﹐R.O.C Abstract We studied a series of Al-Pd-(Re,Fe) QCs and found that McMilain scaling theory of the metal-insulator transition in amorphous materials can predict whether the QCs have been into M-I transition . When Al70Pd22.5(Re0.7Fe0.3)7.5 samples with the resistivity ratio r=ρ(4.2k)/ρ(300k) are greater than 18,their magnetocondunces at low field are positive and their conductivities below about 13K can be analyzed with the following relation : ,where the second term follows Mott's VRH law .This indicates that the samples with r >18 have been in the insulating state.About above 600K,the conductivity of Al70Pd22.5 Re7.5 QCs is found to connect with thermal excitation carriers.