| Summary: | 碩士 === 國立臺灣師範大學 === 物理學系 === 75 ===
In (Lu1-x Erx)RuB2 reentrant superconducting pseudo-ternary system, it had been reported that the behavior of both magnetic transitions as a function of concentration is identical. The second magnetic transition set has not been found in the other reentrant superconducting system yet. The detailed magnetic study in this system becomes very important. Due to the suitable magnetic transition temperatures, 10 K and 6 K, ErRuB2 was taken to do magne-tization measurements in the low temperature range in order to study the anomalous magnetic properties.
On the other hand, a series of isostructural alloys of Y-Ba-Cu-O system had been synthesized for superconduc-ting study. A comparison of the resistivity data, ac magnetic susceptibility measurements exhibits a time dependence of the superconducting transition temperatures Tc. Causes are discussed.
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