MgB2 thin films on Si(111) without a buffer layer prepared by e-beam evaporation

Zhu, Hong; Zhang, Yi Bing; Sun, Xing Lei; Xiong, Wenhui; Zhou, Shi Ping

doi:10.1016/j.physc.2006.11.009

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…The sharp superconductive transition, T c ∼ 0.2 K (from 90% to 10% of the normal state resistance), demonstrates the uniform superconducting property of the films. The ρ-T curve shows the semiconducting behavior (increasing R with the decreasing temperature) above 120 K and weakly metallic characteristics (increasing R with the increasing temperature) below 120 K. This result is similar to some of the ρ-T patterns on Si(111) reported by Zhu et al [6]. It is known that the most important requirement for high quality MgB 2 films is to provide a high Mg vapor pressure or argon gas atmosphere during annealing [2,22].…”

Section: Resultssupporting

confidence: 89%

“…Third, there is thermal decomposition at high temperature in the synthesis of MgB 2 . To fabricate high quality superconducting MgB 2 thin films, several methods have been applied, including two-step in situ annealing techniques [3][4][5][6][7], two-step ex situ annealing techniques [7][8][9][10][11][12][13][14][15][16] and as-grown techniques [2,[17][18][19][20][21][22][23][24] such as hybrid physicalchemical vapor deposition (HPCVD) [2,[17][18][19][20][21][22][23]. In HPCVD B 2 H 6 is flammable, explosive, poisonous and expensive.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of superconducting magnesium diboride thin films by electron beam annealing

Kong

Dai

Han

et al. 2011

Supercond. Sci. Technol.

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The technique of electron beam annealing for fabricating MgB2 thin films has been explored. MgB2 thin films were prepared by e-beam evaporation of M–B precursor films on 6H–SiC (0001) substrates followed by ex situ electron beam annealing without any extra Mg vapor or argon gas protection. The very short annealing duration, about 1 s, effectively prevented volatilization and oxidation of Mg and decomposition of MgB2. In comparison with the MgB2 thin films grown by other techniques, our films show medium qualities including a superconducting transition temperature of Tconset ∼ 35.3 K, a transition width ΔTc ∼ 0.2 K, and a critical current density of Jc(5 K, 0 T) ∼ 3.2 × 106 A cm − 2. Such an electron beam annealing technique has potential for the fabrication of large-scale MgB2 thin films as well as MgB2 wires and tapes.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Fabrication of superconducting magnesium diboride thin films by electron beam annealing

Kong

Dai

Han

et al. 2011

Supercond. Sci. Technol.

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“…MgB 2 has a lot of other advantages, such as simple structure, high critical current density and long coherence length (about 5.2 nm on c axis) [3]. The long coherence length can avoid the problem of grain boundary's weak connection which is common in the high temperature superconductors [4]. Therefore the discovery of MgB 2 's superconductivity inspires researchers to study its preparation methods, physical properties and the application prospect with enormous enthusiasm.…”

Section: Introductionmentioning

confidence: 99%

The Fabrication of MgB<sub>2</sub> Film and Nano-Bridge by EB and FIB

Li¹,

Kong³

et al. 2016

KEM

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100nm thin Mg/B precursor films were prepared on SiC substrates in ZZSX-500 vacuum coating machine. They were annealed by electron-beam(EB) which only took fractions of a second. In this paper the best annealing duration to fabricate the superconducting MgB2 thin films was investigated. Under the optimized annealing condition(accelerating voltage 15kV, electron beam current 5mA, annealing duration 0.7s), the superconducting MgB2 thin film with critical temperature Tconset~35.3 K and transition width ∆Tc~1K was fabricated. Besides that, a nano-bridge (about 100×200nm2) was etched on the superconducting MgB2 thin film by Focused Ion Beam (FIB). It’s a relative simple and efficient method. The nano-bridge exhibited the effect of Josephson junction with RSJ characteristics. At the same time a little loss of superconducting property was detected.

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“…The primary problem to prepare MgB 2 superconducting devices is the preparation of high-quality MgB 2 thin films. Developed for nearly 11 years, several conventional thermal annealing methods, such as ex situ annealing methods [1][2][3][4], in situ annealing methods [5][6] and as-grown techniques [7][8][9][10][11][12][13], have been applied to the fabrication of MgB 2 films. But ex situ and in situ annealing method usually needs more than several minutes or even 10 min to finish the annealing process and their heating and cooling rates are slow.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electron-Beam Annealing Duration on MgB<sub>2</sub> Film Superconductivity

Kong

Dai

Han

et al. 2013

MSF

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A novel method to fabricate Magnesium diboride ( MgB2) film by electron beam annealing was presented. The MgB2 thin films could be prepared in a second or sub-second without any toxic diborane gas, extra Mg vapor or argon gas. The method has the advantages of short formation time and high efficiency. Based on this, the relationship between MgB2 conductivity and electron beam annealing duration was investigated experimentally with an accelerating voltage of 40 × 103 V, a beam current of 3×103 A and different annealing durations of 0.1796s, 1860s, 0.2108s, 0.2200s and 0.2332s. The experimental results showed the MgB2 film with 0.2200s has the highest Tconset , the most dense structure and the strongest diamagnetic signal. Its zero-field Jc at 5 K was 5.0 × 106 A/cm2. Also the variation of the film superconducting properties with the annealing duration was found, it will provide an important reference for the preparation of high-quality MgB2 thin films.

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MgB2 thin films on Si(111) without a buffer layer prepared by e-beam evaporation

Cited by 11 publications

References 20 publications

Fabrication of superconducting magnesium diboride thin films by electron beam annealing

Fabrication of superconducting magnesium diboride thin films by electron beam annealing

The Fabrication of MgB<sub>2</sub> Film and Nano-Bridge by EB and FIB

Influence of Electron-Beam Annealing Duration on MgB<sub>2</sub> Film Superconductivity

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