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首页> 外文期刊>International Journal of Modern Physics, B. Condensed Matter Physics, Statistical Physics, Applied Physics >c-axis twist Bi_2Sr_2CaCu_2O_(8 + #delta#) josephson junctions: a new phase-sensitive test of order parameter symmetry
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c-axis twist Bi_2Sr_2CaCu_2O_(8 + #delta#) josephson junctions: a new phase-sensitive test of order parameter symmetry

机译:c轴扭曲Bi_2Sr_2CaCu_2O_(8 +#delta#)josephson结:一种新的阶跃参数对称性的相敏测试

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Li et al. found that the critical current density J_C~J across atomically clean c-axis twist junctions of Bi_2Sr_2CaCu_2O_(8 + #delta#) is the same as that of the consituent single crystal, J_C~S, independent of the twist angle #phi#_0, even at and below T_c. We investigated theoretically if a d_(x~2-y~(2-)) wave order parameter might twist by mixing in d_(xy)-wave components, but found that such mixing cannot possibly explain the data near to T_c. Combined with group theoretical arguments, we then conclude that the order parameter contains at least a substantial s- wave component, but does not contain any purported d_(x~2-y~(2-)) wave component, except possibly below a second, unobserved phase transition. By studying tunneling models, we further conclude that the intrinsic c-axis Josephson tunneling in Bi_2Sr_2CaCu_2O_(8 + #delta#) is likely to be mostly incoherent. We also propose a c-axis junction version of a tricrystal experiment, which does not rely upon expensive substrates.
机译:Li等。发现Bi_2Sr_2CaCu_2O_(8 +#delta#)的原子清洁c轴扭曲结上的临界电流密度J_C〜J与组成单晶J_C〜S相同,不受扭曲角#phi#_0的影响,即使在T_c及以下。我们在理论上研究了d_(x〜2-y〜(2-))波次参数是否可能因混入d_(xy)波分量而扭曲,但发现这种混合可能无法解释T_c附近的数据。结合群理论论证,我们得出的结论是,阶参数至少包含实质性的s波成分,但不包含任何声称的d_(x〜2-y〜(2-))波成分,除非可能低于一秒。 ,未观察到相变。通过研究隧道模型,我们进一步得出结论,Bi_2Sr_2CaCu_2O_(8 +#delta#)中的固有c轴约瑟夫森隧道可能大部分是不连贯的。我们还提出了三晶体实验的c轴连接版本,该版本不依赖于昂贵的基板。

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