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Proximity effects and pair currents in cuprate junctions

机译：铜交界处的邻近效应和对电流

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Proximity effects and pair currents were measured in epitaxial trilayer c-axis junctions comprised of a PrBa2Cu3O7-delta barrier sandwiched in between an overdoped Y0.94Ca0.06Ba2Cu3O7-delta d layer and underdoped YBa2Cu2.7Co0.3Oy layer. These junctions had two T-c values of T-c(high) = 84-86 K and T-c(low)= 50-55 K, allowing investigation when both electrodes are superconducting, or when only one is superconducting while the other is in its pseudogap regime. For T below T-c(high) but much above T-c(low), two distinct proximity effect transitions were observed in the resistance at two temperature regimes, between 80 and 84 K, and 76 to 80 K. The first is a conventional proximity effect with the Tc(high) electrode, while the second is a second order proximity effect of this electrode with uncorrelated pairs in the pseudogap regime. Conductance spectra measured between 2 and 86 K showed four different I-c pair currents which were attributed to coherent pairs tunneling through the barrier below 42 K, to a fluctuating pairs current up to similar to 77 K, and to a proximity pairs current between 77 and 84 K. All pair currents were suppressed under magnetic fields, with two distinct decay parameters that originated in the two different electrodes, with a significant suppression observed in the pseudogap regime.
机译：在外延三层C轴联结中测量邻近效应和对电流，其包括夹在过掺杂的Y0.94ca0.06ba2cu3O7-delta D层和下掺杂的YBA2Cu2.7CO0.4oy层之间的PRBA2Cu3O7-Delta屏障中。这些结具有T-C（高）= 84-86 k和T-C（低）= 50-55k的两种T-C值，允许调查两个电极是超导，或者只有一个是超导时，而另一个电极在其伪导管中。对于下面的Tc（高）但高于Tc（低），在两个温度制度的电阻下观察到两个不同的接近效应转变，80至84k，76至80k。首先是常规邻近效应TC（高）电极，而第二个是PseudoGAP制度中具有不相关对的该电极的二阶近效应。在2和86k之间测量的电导光谱显示出四种不同的IC对电流，其归因于通过低于42k的屏障隧穿的相干对对，与77k相似的波动对电流，并且到77和84之间的接近对电流。 K.在磁场下抑制了所有对电流，具有两个不同的衰减参数，该衰减参数源于两个不同的电极，在PseudoGAP制度中观察到显着抑制。

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