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首页> 外文期刊>Physica status solidi, B. Basic research >Excess currents in planar Ba(Fe1-xCox)(2)As-2/TiOx/Pb Josephson junctions
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Excess currents in planar Ba(Fe1-xCox)(2)As-2/TiOx/Pb Josephson junctions

机译：平面Ba（Fe1-xCox）（2）As-2 / TiOx / Pb Josephson结中的过电流

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We prepared planar hybrid Josephson junctions using Co-doped BaFe2As2 thin films and polished single crystals as base electrode, sputtered, and subsequently oxidized titanium layers as barrier and a counter electrode from evaporated lead. On all junctions, RCSJ-like current-voltage characteristics could be observed. The obtained IeRn products at 4.2K range up to 95 mu V for thin film junctions and up to 1.15mV for junctions on single crystals. For most of the junctions, an excess current with variable contribution to the total current could be observed. Unusual temperature dependencies are discussed for the critical and the excess currents, respectively. Investigations of the junctions under microwave irradiation were performed, therein Shapiro steps up to high orders and very clear modulations of the steps could be observed. Additionally, the origin of the excess current is discussed with respect to the microwave dependence. Furthermore, instead of a single junction, a network-like modulation behavior of the critical current in magnetic fields was observed. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
机译：我们使用钴掺杂的BaFe2As2薄膜和抛光的单晶作为基础电极，溅射并随后氧化钛层作为阻挡层以及与蒸发的铅形成的对电极，制备了平面混合约瑟夫逊结。在所有结点上，都可以观察到类似RCSJ的电流-电压特性。在4.2K下获得的IeRn产物，对于薄膜结，范围高达95μV，对于单晶结，范围高达1.15mV。对于大多数结，可以观察到对总电流有不同贡献的过量电流。分别针对临界电流和过剩电流讨论了异常的温度依赖性。对微波照射下的接合处进行了研究，其中Shapiro台阶达到高阶，并且可以观察到非常清晰的台阶调制。另外，关于微波依赖性讨论了过量电流的起源。此外，代替单个结，还观察到了临界电流在磁场中的类似网络的调制行为。 （C）2015 WILEY-VCH Verlag GmbH＆Co.KGaA，Weinheim

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