Superconducting thin films of MgB2 on Si by pulsed laser deposition

Brinkman, Alexander; Mijatovic, D.; Rijnders, Guus; Leca, V.; Smilde, H.J.H.; Oomen, I.; Golubov, A. A.; Roesthuis, F.J.G.; Harkema, Sybolt; Hilgenkamp, H.; Blank, Dave H.A.; Rogalla, Horst

doi:10.1016/s0921-4534(01)00396-3

Cited by 69 publications

(42 citation statements)

References 6 publications

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“…Regarding the origin of the oxides present in the thin film composition, XPS measurements performed on a piece of target revealed more or less the same quantity of oxide; this is put in evidence also by the green color of the plasma plume during the deposition. As suggested in [5], this color is related to optical emission by MgO, while the color of metallic magnesium is blue. The presence of oxygen in the target could be an obstacle for obtaining the formation of the superconducting phase of MgB 2 .…”

Section: Ex Situ Depositionmentioning

confidence: 67%

“…Actually, thin film deposition of this material is a quite difficult task due to the high volatility of Mg, so that MgB 2 growth seems impossible in vacuum conditions. This necessity imposes severe restrictions on deposition systems and, up to now, superconducting thin films have been produced only via ex-situ annealing in magnesium atmosphere [5,6]. Very recently, an in situ annealing has been proposed [7] to react, after the deposition, stoichiometric or Mg rich mixture of magnesium and…”

Section: Introductionmentioning

confidence: 99%

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As-grown magnesium diboride superconducting thin films deposited by pulsed laser deposition

Grassano

Ramadan

Ferrando

et al. 2001

Supercond. Sci. Technol.

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Superconducting thin films of MgB 2 were deposited by Pulsed Laser Deposition on magnesium oxide and sapphire substrates. Samples grown at 450ºC in an argon buffer pressure of about 10 -2 mbar by using a magnesium enriched target resulted to be superconducting with a transition temperature of about 25 K. Film deposited from a MgB 2 sintered pellet target in ultra high vacuum conditions showed poor metallic or weak semiconducting behavior and they became superconducting only after an ex-situ annealing in Mg vapor atmosphere. Up to now, no difference in the superconducting properties of the films obtained by these two procedures has been evidenced.The recent outstanding discovery of 40K superconductivity in MgB 2 [1, 2] is a breakthrough that stimulated a worldwide excitement in the scientific community renewing the interest on superconductivity. This material exhibits a lot of intriguing properties: it is the compound with the highest T c among non-oxides materials and first reports indicate a phonon mediated mechanism for the superconductivity making MgB 2 also the BCS materials with the highest T C [3]. Furthermore, the grains boundaries have not dramatic effects on the critical current densities, being of its coherence length longer than those of HTSC. The reported properties, the very simple structure and the commercial availability of this material make MgB 2 a favorite candidate for large scale and electronic applications and suggest the possibility of further progress in technology based on superconducting materials. The main limitation for the application seems to be related to the considerable small value of the irreversibility field (about 7 Tesla at liquid helium temperature) [4]. High quality epitaxial thin film are needed to implement a new class of electronic devices. Actually, thin film deposition of this material is a quite difficult task due to the high volatility of Mg, so that MgB 2 growth seems impossible in vacuum conditions. This necessity imposes severe restrictions on deposition systems and, up to now, superconducting thin films have been produced only via ex-situ annealing in magnesium atmosphere [5,6]. Very recently, an in situ annealing has been proposed [7] to react, after the deposition, stoichiometric or Mg rich mixture of magnesium and

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Section: Ex Situ Depositionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

As-grown magnesium diboride superconducting thin films deposited by pulsed laser deposition

Grassano

Ramadan

Ferrando

et al. 2001

Supercond. Sci. Technol.

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“…The film growth of MgB 2 superconductors has been achieved using molecular beam epitaxy (MBE) [50][51][52], pulsed laser deposition (PLD) [2,[53][54][55], hybrid physical-chemical vapor deposition (HPCVD) [56][57][58], electron beam evaporation (EBE) [59][60][61], and the modified reactive method [62,63] etc. Among all these techniques, HPCVD has been proved to be the most effective one for the fabrication of highquality MgB 2 films with superior superconducting properties [58,64].…”

Section: Hpcvd For Mgb 2 Coated Conductorsmentioning

confidence: 99%

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

Ranot

Kang

2012

Current Applied Physics

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The MgB 2 coated superconducting tapes have been fabricated on textured Cu (0 0 1) and polycrystalline Hastelloy tapes using coated conductor technique, which has been developed for the second generation high temperature superconducting wires. The MgB 2 /Cu tapes were fabricated over a wide temperature range of 460-520 °C by using hybrid physical-chemical vapor deposition (HPCVD) technique. The tapes exhibited the critical temperatures (T c ) ranging between 36 and 38 K with superconducting transition width (∆T c ) of about 0.3-0.6 K. The highest critical current density (J c ) of 1.34 × 10 5 A/cm 2 at 5 K under 3 T is obtained for the MgB 2 /Cu tape grown at 460 ºC. To further improve the flux pinning property of MgB 2 tapes, SiC is coated as an impurity layer on the Cu tape. In contrast to pure MgB 2 /Cu tapes, the MgB 2 on SiC-coated Cu tapes exhibited opposite trend in the dependence of J c with growth temperature. The improved flux pinning by the additional defects created by SiC-impurity layer along with the MgB 2 grain boundaries lead to strong improvement in J c for the MgB 2 /SiC/Cu tapes. The MgB 2 /Hastelloy superconducting tapes fabricated at a temperature of 520 °C showed the critical temperatures ranging between 38.5 and 39.6 K. We obtained much higher J c values over the wide field range for MgB 2 /Hastelloy tapes than the previously reported data on other metallic substrates, such as Cu, SS, and Nb. The J c values of J c (20 K, 0 T) ~5.8 × 10 6 A/cm 2 and J c (20 K, 1.5 T) ~2.4 × 10 5 A/cm 2 is obtained for the 2-µm-thick MgB 2 /Hastelloy tape. This paper will review the merits of coated conductor approach along with the HPCVD technique to fabricate MgB 2 conductors with high T c and J c values which are useful for large scale applications.

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“…This behavior will restrict approaches to single crystal growth. Pulsed laser deposition techniques have already been used to grow MgB 2 films on various substrates followed by an ex-situ [8][9][10] or in-situ 11 anneal. The T c varies from 12…”

mentioning

confidence: 99%

Superconducting MgB2 films via precursor postprocessing approach

Paranthaman

Cantoni

Zhai

et al. 2001

Applied Physics Letters

134

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to 39 K in these reports. Here, we report our successful demonstration of the growth of 3 superconducting MgB 2 films using electron beam evaporated B precursor films followed by appropriate post-annealing. We also report results of transport property measurements on these ex-situ grown MgB 2 films. The MgB 2 films had a sharp T c (zero resistance) of 38.0 K with a ∆T c of 0.3 K and a ratio of the room temperature resistivity to the residual resistivity above T c of about 2. The resistivity decreased linearly with temperature indicating that the MgB 2 film is metallic.

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Superconducting thin films of MgB2 on Si by pulsed laser deposition

Cited by 69 publications

References 6 publications

As-grown magnesium diboride superconducting thin films deposited by pulsed laser deposition

As-grown magnesium diboride superconducting thin films deposited by pulsed laser deposition

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

Superconducting MgB2 films via precursor postprocessing approach

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