Süperiletken Durumda Cıva Bazlı Bakır Oksit Katmanlı Süperiletkenin Özgül Kapasitanslarının Tespiti

Süperiletken-yalıtkan-süperiletken (SYS) katmanlardan oluşan cıva bazlı bakır oksit katmanlı yüksek sıcaklık süperiletkenleri neredeyse ideal, asli Josephson kavşakları dizisi olarak göz önüne alınabilir. Elektrik alanı hapseden bir SYS kavşağı, topolojik olarak paralel plakalı bir kapasitöre benzer. Bilindiği üzere, süperiletkenlerdeki kavşaklar arasındaki kuplaj kapasitiftir. Bundan dolayı, süperiletken durumda özgül kapasitans, Cs’nin tespiti süperiletkenlik mekanizması hakkında bilgi elde etmek için çok büyük bir öneme sahiptir. Bu çalışmada, incelenen örneğin Csdeğerleri kritik geçiş sıcaklığı olan Tc’den daha düşük sıcaklıklarda yapılan manyetik ölçümlerden elde edilen kritik akım yoğunluğu, Jc ve plazma frekansı değerleri aracılığıyla elde edildi. Ayrıca süperiletken sıcaklıkta Cs değerleri normal durumdaki Cs değerleriyle de karşılaştırılmıştır.

The Determination of the Specific Capacitance of Mercury Based Copper Oxide Layered Superconductor at Superconducting State

Mercury based copper oxide layered high temperature superconductor,which consists of superconductor–insulator–superconductor (SIS) layers, can beconsidered as a stack of nearly ideal, intrinsic Josephson junctions (IJJ). TheSIS junction, where the electrical field is confined, topologically resembles aparallel-plate capacitor. As is known, the coupling between junctions in superconductorsis capacitive. Hence, the determination of the specific capacitance (Cs) of the IJJ at thesuperconducting state has a crucial importance in order to give informationabout superconductivity mechanism. In this study, the Cs values of the investigated sample have beencalculated by means of the critical current density, Jcand plasma frequency, that have been obtained frommagnetic measurements taken at the below temperatures than the criticaltransition temperature, Tc.Moreover, Cs values at superconductingtemperature have been compared to that of the normal temperature.

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