We have fabricated Tl 2 Ba 2 CaCu 2 O 8 (Tl-2212) bicrystal Josephson junctions (BJJs) on LaAlO 3 substrates and operated them at bath temperatures close to 100 K. The current-voltage characteristics of BJJs reveal that the critical current I c has a power-law relationship with temperature. In addition, the normal resistance R n has a universal value independent of the bath temperature. The performance of BJJs exhibits a perfect agreement with the Ambegaokar-Halperin model close to 100 K. Under microwave irradiation, Shapiro steps were clearly observed, confirming the genuine Josephson coupling through the grain boundary. We demonstrate that the maximum operating temperature of the proposed junction is up to 100 K, which is fairly close to the T c of the specimen. The results of Tl-2212 bicrystal Josephson junctions may open a new perspective in further...

中文翻译：

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Tl 2 Ba 2 CaCu 2 O 8双晶约瑟夫森结的工作接近100 K

我们在LaAlO 3衬底上制造了Tl 2 Ba 2 CaCu 2 O 8（Tl-2212）双晶约瑟夫森结（BJJs），并在接近100 K的浴温下对其进行了操作。BJJs的电流电压特性表明，临界电流I c与温度具有幂律关系。另外，法向电阻R n具有与浴温无关的通用值。BJJs的性能与接近100 K的Ambegaokar-Halperin模型表现出完美的一致性。在微波辐射下，清晰地观察到Shapiro台阶，证实了通过晶界的真正约瑟夫森耦合。我们证明了所提出的结的最高工作温度高达100 K，这非常接近样品的T c。