Evidence for multi-gap symmetry from grain boundary effects in polycrystalline Ba0.6K0.4Fe2As2 microbridge

Ya Huang; Xian Jing Zhou; Zhao Shun Gao; Hao Wu; Ge He; Jie Yuan; Kui Jin; Paulo J. Pereira; Min Ji; De Yue An; Jun Li; Takeshi Hatano; Biao Bing Jin; Hua Bing Wang; Pei Heng Wu

doi:10.1088/0953-2048/30/1/015006

Evidence for multi-gap symmetry from grain boundary effects in polycrystalline Ba_0.6K_0.4Fe₂As₂ microbridge

Ya Huang
, Xian Jing Zhou
, Zhao Shun Gao
, Hao Wu
, Ge He
, Jie Yuan
, Kui Jin
, Paulo J. Pereira
, Min Ji
, De Yue An
, Jun Li^*
, Takeshi Hatano
, Biao Bing Jin
, Hua Bing Wang
, Pei Heng Wu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We studied the grain boundaries within mechanically formed polycrystalline Ba_0.6K_0.4Fe₂As₂ micro-bridges. By tunneling current across grain boundaries, current-voltage characteristics (IVCs) demonstrated the typical Josephson weak links behavior in micro-bridges. Shapiro steps were observed for the junctions under the microwave radiation at 10 GHz. The temperature dependence of the critical current I_c was observed as a shoulder, corresponding to a multi-gap symmetry but not a single-gap s-wave or d-wave.

Original language	English
Article number	015006
Journal	Superconductor Science and Technology
Volume	30
Issue number	1
DOIs	https://doi.org/10.1088/0953-2048/30/1/015006
Publication status	Published - Jan 2017
Externally published	Yes

Keywords

grain boundary effect
iron-based superconductors
Josephson junction
multi-gap symmetry

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10.1088/0953-2048/30/1/015006

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Huang, Y., Zhou, X. J., Gao, Z. S., Wu, H., He, G., Yuan, J., Jin, K., Pereira, P. J., Ji, M., An, D. Y., Li, J., Hatano, T., Jin, B. B., Wang, H. B., & Wu, P. H. (2017). Evidence for multi-gap symmetry from grain boundary effects in polycrystalline Ba_0.6K_0.4Fe₂As₂ microbridge. Superconductor Science and Technology, 30(1), Article 015006. https://doi.org/10.1088/0953-2048/30/1/015006

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title = "Evidence for multi-gap symmetry from grain boundary effects in polycrystalline Ba0.6K0.4Fe2As2 microbridge",

abstract = "We studied the grain boundaries within mechanically formed polycrystalline Ba0.6K0.4Fe2As2 micro-bridges. By tunneling current across grain boundaries, current-voltage characteristics (IVCs) demonstrated the typical Josephson weak links behavior in micro-bridges. Shapiro steps were observed for the junctions under the microwave radiation at 10 GHz. The temperature dependence of the critical current Ic was observed as a shoulder, corresponding to a multi-gap symmetry but not a single-gap s-wave or d-wave.",

keywords = "grain boundary effect, iron-based superconductors, Josephson junction, multi-gap symmetry",

author = "Ya Huang and Zhou, \{Xian Jing\} and Gao, \{Zhao Shun\} and Hao Wu and Ge He and Jie Yuan and Kui Jin and Pereira, \{Paulo J.\} and Min Ji and An, \{De Yue\} and Jun Li and Takeshi Hatano and Jin, \{Biao Bing\} and Wang, \{Hua Bing\} and Wu, \{Pei Heng\}",

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year = "2017",

month = jan,

doi = "10.1088/0953-2048/30/1/015006",

language = "English",

volume = "30",

journal = "Superconductor Science and Technology",

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T1 - Evidence for multi-gap symmetry from grain boundary effects in polycrystalline Ba0.6K0.4Fe2As2 microbridge

AU - Huang, Ya

AU - Zhou, Xian Jing

AU - Gao, Zhao Shun

AU - Wu, Hao

AU - He, Ge

AU - Yuan, Jie

AU - Jin, Kui

AU - Pereira, Paulo J.

AU - Ji, Min

AU - An, De Yue

AU - Li, Jun

AU - Hatano, Takeshi

AU - Jin, Biao Bing

AU - Wang, Hua Bing

AU - Wu, Pei Heng

PY - 2017/1

Y1 - 2017/1

N2 - We studied the grain boundaries within mechanically formed polycrystalline Ba0.6K0.4Fe2As2 micro-bridges. By tunneling current across grain boundaries, current-voltage characteristics (IVCs) demonstrated the typical Josephson weak links behavior in micro-bridges. Shapiro steps were observed for the junctions under the microwave radiation at 10 GHz. The temperature dependence of the critical current Ic was observed as a shoulder, corresponding to a multi-gap symmetry but not a single-gap s-wave or d-wave.

AB - We studied the grain boundaries within mechanically formed polycrystalline Ba0.6K0.4Fe2As2 micro-bridges. By tunneling current across grain boundaries, current-voltage characteristics (IVCs) demonstrated the typical Josephson weak links behavior in micro-bridges. Shapiro steps were observed for the junctions under the microwave radiation at 10 GHz. The temperature dependence of the critical current Ic was observed as a shoulder, corresponding to a multi-gap symmetry but not a single-gap s-wave or d-wave.

KW - grain boundary effect

KW - iron-based superconductors

KW - Josephson junction

KW - multi-gap symmetry

UR - https://www.scopus.com/pages/publications/84999780252

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DO - 10.1088/0953-2048/30/1/015006

M3 - Article

AN - SCOPUS:84999780252

SN - 0953-2048

VL - 30

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 1

M1 - 015006

ER -

Evidence for multi-gap symmetry from grain boundary effects in polycrystalline Ba_0.6K_0.4Fe₂As₂ microbridge

Abstract

Keywords

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