Construction of tunnel junction and research on Josephson effect in iron-based superconductors

WANG, Teng; YU, AoBo; LI, ChunHong; LIU, YiXin; PENG, Wei; JIANG, Da; MU, Gang

doi:10.1360/sspma-2023-0196

Cited by 1 publication

(1 citation statement)

References 29 publications

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“…[19,20] When it comes to the field of superconducting electronics based on Josephson junctions (JJs), however, the short coherence length and the insensitive nature of iron-based superconductor to grain boundaries makes it difficult to fabricate JJs, which is disadvantageous not only for the exploration of the basic physics of the iron-based superconductors but also for the development of iron pnictides based superconducting electronic devices such as superconducting quantum interference devices (SQUIDs) [21] and terahertz (THz) mixers. [22] Among the iron pnictides, Co doped BaFe 2 As 2 (Ba122:Co) thin film prepared by pulsed laser deposition (PLD) has improved crystallinity and superconducting properties, which is suitable for fabricating high quality junctions and thin-film based devices. Hybrid junction technique [23] and bi-crystal junction technique [21,24] are two main techniques currently used for fabricating pnictide Josephson junctions.…”

Section: Introductionmentioning

confidence: 99%

Co-doped BaFe₂As₂ Josephson junction fabricated with a focused helium ion beam

Chen 陈,

Zhang 张,

Ma 马

et al. 2024

Chinese Phys. B

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Josephson junction plays a key role not only for studying the basic physics of unconventional iron-based superconductors but also for realizing practical application of thin-film based devices, therefore the preparation of high-quality iron pnictide Josephson junctions is of great importance. In this work, we have successfully fabricated Josephson junctions from Co-doped BaFe2As2 thin films using a direct junction fabrication technique which utilizes high energy focused helium ion beam (FHIB). The electrical transport properties were investigated for junctions fabricated with various of He+ irradiation doses. The junctions show sharp superconducting transition around 24 K with a narrow transition width of 2.5 K, and a dose correlated foot-structure resistance which corresponds to the effective tuning of junction properties by He+ irradiation. Significant J c suppression by more than two orders of magnitude can be achieved with increasing the He+ irradiation dose, which is advantageous for the realization of low noise ion pnictide thin film devices. Clear Shapiro steps were observed under 10 GHz microwave irradiation. The above results demonstrate the successful fabrication of high quality and controllable Co-doped BaFe2As2 Josephson junction with high reproducibility using the FHIB technique, laying the foundation for future investigating the mechanism of iron-based superconductors, and also the further implementation of various superconducting electronic devices.

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