Properties of Gallium in Porous Glass
博士 === 國立成功大學 === 物理學系 === 85 === We have studied the physical properties of gallium microparticles embeded in porous glass .Near the temperature of superconducting phase transition,the main pattern of the X-ray does not fit in with any previously repoted...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
1997
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/43278455037680020162 |
| Summary: | 博士 === 國立成功大學 === 物理學系 === 85 === We have studied the physical properties of gallium
microparticles embeded in porous glass .Near the temperature of
superconducting phase transition,the main pattern of the X-ray
does not fit in with any previously repoted phase of gallium
.Even though sample resistance had two-stage superconducting
phase transition correspond to 7 K and 6.3 K, but from the
magnetic measurement there is only one superconducting phase
transition at 6.3 K~6.4 K.Sample show complete diamagnetic
behavior as whole volume were the same material. Magnetic moment
had a abrupt change at 4.5 K to 4.4 K as sample cooling in
magnetic field . We suggest that there was phase transition
correspond to vortex lattice freezing. Temperature hysteresis
between melting and freezing of vortex were observed. Magnetic
hysteresis at high field range showed that gallium micropartiles
formed grain by strong coupling. Magnetic hysteresis at low
field range seemed that grains were coupled by Josephson weak
links and sample behavior as a granular superconductor.
|
|---|