α-粒子束辐照对薄膜mgb2超导体超导性能的影响

IF 0.2 Q4 PHYSICS, APPLIED

Progress in Superconductivity and Cryogenics Pub Date : 2016-06-30 DOI:10.9714/PSAC.2016.18.2.008

Sangbum Kim, P. Duong, D. Ha, Y. Oh, W. Kang, S. Hong, Ranyoung Kim, J. Chai

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引用次数: 3

摘要

研究了45 MeV粒子束辐照MgB2超导体薄膜的超导性能。辐照后，临界电流密度和钉钉力均有增强，尺度接近强钉钉公式。在不可逆磁场作用下，最大钉钉力密度的双对数图显示出与掺杂碳的MgB2薄膜或多晶体相似的幂律行为。归一化钉钉力密度在降磁场下的变化，给出了平面缺陷等强钉钉机制的标度公式。我们还观察到，由于涡旋和磁场之间的强相互作用，随着涡旋晶格常数的减小，临界电流密度迅速衰减。

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Effects of α-particle beam irradiation on superconducting properties of thin film MgB 2 superconductors

Superconducting properties of thin film MgB2 superconductors irradiated with 45 MeV  -particle beam were studied. After the irradiation, enhancement of the critical current density and pinning force was observed, scaling close to strong pinning formula. Double logarithmic plots of the maximum pinning force density with irreversible magnetic field show a power law behavior close to carbon-doped MgB2 film or polycrystals. Variation of normalized pinning force density in the reduced magnetic field suggests scaling formulas for strong pinning mechanism like planar defects. We also observed a rapid decay of critical current density as the vortex lattice constant decreases, due to the strong interaction between vortices and increasing magnetic field.

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来源期刊

Progress in Superconductivity and Cryogenics PHYSICS, APPLIED-

CiteScore

0.40

自引率

33.30%

发文量

期刊介绍： Progress in Superconductivity and Cryogenics is the official publication of The Korea Institute of Applied Superconductivity and Cryogenics and the Korean Superconductivity Society. It was launched in 1999, and accepts original research articles and review papers on research on superconductivity and related fields of physics, electronic devices, materials science, large-scale applications for magnets, power and energy, and cryogenics. The Journal is published quarterly in March, June, September, and December each year. Supplemental issues are published occasionally. The official title of the journal is ''Progress in Superconductivity and Cryogenics'' and the abbreviated title is ''Prog. Supercond. Cryog.'' All submitted manuscripts are peer-reviewed by two reviewers. The text must be written in English. All the articles in this journal are KCI and SCOPUS as of 2015. The URL address of the journal is http://psac.kisac.org where full text is available. This work was supported by the Korean Federation of Science and Technology Societies grant funded by the Korea government.