鈦參雜鈷之系統將彰顯其超導性

Abstract

我們製作了一系列純鈦金屬分別參雜不同濃度的鈷元素樣品，其濃度分布介於數個ppm到數仟個ppm之間，首先由樣品的X-ray繞射圖譜了解到熱處理對其結構具有正面的影響，並藉由測量其比熱隨溫度的變化關係發現樣品在超導相變溫度(TC)的比熱沒有產生峰值；此外利用超導量子干涉儀(SQUID)測量樣品的磁化率隨溫度的變化關係，由於超導體的排磁性可以觀察到在高於相變溫度的磁化率呈現定值並沒有逐漸上升的現象，直到溫度低於TC時樣品磁化率便迅速下降到一個固定的負值。最後隨著參雜鈷濃度的增加，我們發現樣品的超導溫度亦隨之上升。

A series of the specimens of pure Ti doped different concentration of Co have been made, and the concentration of Cobalt of specimens were distributed between several ppm and thousands of ppm. First, the inner structure of the samples has been positively affected by the heat treatment (annealing) from the X-ray diffraction spectrums. By measuring the various relation of specific heat-temperature curves, there were found that the pick of the curves of the specimens did not happened near the superconducting transition temperature (TC). Moreover, the relation of susceptibility- temperature curves of the samples can be measured by superconducting quantum interference device (SQUID). When the temperature was higher than TC, the susceptibility was invariable. Because of the diamagnetism (i.e., the Meissner effect), as the temperature was close to the transition temperature, the susceptibility could become a negative invariant. Finally, with the increasing of the concentration of Cobalt, the higher transition temperature (TC) could be found.