Superconductivity and magnetic properties in CeCo2 nanoparticles

• Main Author: 王紀友
• Other Authors: W.H. Lee
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/59173495527652722950

碩士 === 國立中正大學 === 物理系 === 89 === It was known that the magnetic properties were influenced by the size of specimens in some Ce-based compounds as the size approaches to nanometer scale. There are a few of superconducting compounds in heavy fermion system. In this study, the difference of magnetic properties and superconductivity in CeCo2 bulk and nanoparticles specimens is reported. CeCo2 bulk is a Tc=0.9~1.5K superconducting compound with Pauli paramagnetism, whereas CeCo2 nanoparticles exhibit more complex magnetic properties and superconductivity. In specific heat of CeCo2 nanoparticles, an anomaly at T=0.5~1K was observed. This is conjectured to be an incomplete suppression of superconductivity. The linear coefficient of heat capacity γ=350 mJ/mole‧K2 of nanoparticles is extraordinarily larger than that of bulk. A superparamagnetic behavior was shown at T＞200K and a low-temperature spin-glass-like behavior was observed at T＝10~30K.