Transmission electron microscopy study of as-grown MgB2 films

Takahashi, Toshio; Harada, Y.; Iriuda, H.; Kuroha, Masatake; Oba, T.; Seki, Masanori; Nakanishi, Y.; Echigoya, J.; Yoshizawa, Michito

doi:10.1016/j.physc.2006.05.065

Cited by 8 publications

(9 citation statements)

References 15 publications

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“…Thus we can conclude that the MgO plates are oriented with (0 0 1) MgO planes parallel to (0 0 1) MgB2 MgB 2 planes. This mutual orientation of cubic MgO and hexagonal MgB 2 phases has already been observed and discussed [25][26][27][28][29][30][31]. 1 0 MgO [29].…”

Section: Grains and Inter-grain Secondary Phase Layerssupporting

confidence: 65%

Microstructure of MgB 2 superconducting wire prepared by internal magnesium diffusion and in-situ powder-in-tube processes – Secondary phase intergrain nanolayers as an oxygen content indicator

Rosová

Kòváč

Hušek

et al. 2015

Physica C: Superconductivity and its Applications

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Section: Grains and Inter-grain Secondary Phase Layerssupporting

confidence: 65%

Microstructure of MgB 2 superconducting wire prepared by internal magnesium diffusion and in-situ powder-in-tube processes – Secondary phase intergrain nanolayers as an oxygen content indicator

Rosová

Kòváč

Hušek

et al. 2015

Physica C: Superconductivity and its Applications

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“…MgB 2 thin films were deposited on MgO(100), Si(111) and ZnO(001) substrates with Ti buffer layer and MgO substrate without Ti buffer layer by MBE [6]. The substrates were set in the deposition chamber, and heated at 200 °C by tantalum heater.…”

Section: Methodsmentioning

confidence: 99%

Flux pinning properties of MgB2 thin films on Ti buffered substrate prepared by molecular beam epitaxy

Yonekura

Kugo

Fujiyoshi

et al. 2010

Physica C: Superconductivity and its Applications

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Transport properties of the MgB 2 thin films on Si, MgO and ZnO substrates with Ti buffer layer prepared by molecular beam epitaxy were investigated to clarify effects of the substrates and the Ti buffer layer on flux pinning. The critical current density J c of each sample shows different dependence on magnetic fields parallel to c-axis. However, the scaling analysis of the macroscopic pinning force for all the measured samples implies that the grain boundaries work as the dominant pinning centers for B//c. The pinning parameter for MgB 2 /Ti/Si estimated from the electric field E vs. the current density J characteristics shows the highest value among all the measured samples. This result is attributed to the high density of grain boundaries caused by the effect of both the Ti buffer and Si substrate in the growth process. Therefore, the selection of substrates and buffer layer strongly affects the flux pining properties of MgB 2 thin films and plays an important role in the determination of performance for superconducting devices and wires.

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“…Four MgB 2 films were prepared by Iwate group using an MBE apparatus with the co-evaporation conditions of low deposition rate in ultrahigh vacuum without post annealing process 18,19,20 . Two of them were deposited on MgO (100) (#1) and Si (111) (#2) substrates at 200…”

Section: Methodsmentioning

confidence: 99%

Systematic characterization of upper critical fields for MgB₂thin films by means of the two-band superconducting theory

Noguchi

Kuribayashi

Oba

et al. 2009

Supercond. Sci. Technol.

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We present experimental results of the upper critical fields Hc2 of various MgB2 thin films prepared by the molecular beam epitaxy, multiple-targets sputtering, and co-evaporation deposition apparatus. Experimental data of the Hc2(T ) are successfully analyzed by applying the Gurevich theory of dirty two-band superconductivity in the case of Dπ/Dσ > 1, where Dπ and Dσ are the intraband electron diffusivities for π and σ bands, respectively. We find that the parameters obtained from the analysis are strongly correlated to the superconducting transition temperature Tc of the films. We also discuss the anormalous narrowing of the transition width at intermediate temperatures confirmed by the magnetoresistance measurements.

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Transmission electron microscopy study of as-grown MgB2 films

Cited by 8 publications

References 15 publications

Microstructure of MgB 2 superconducting wire prepared by internal magnesium diffusion and in-situ powder-in-tube processes – Secondary phase intergrain nanolayers as an oxygen content indicator

Microstructure of MgB 2 superconducting wire prepared by internal magnesium diffusion and in-situ powder-in-tube processes – Secondary phase intergrain nanolayers as an oxygen content indicator

Flux pinning properties of MgB2 thin films on Ti buffered substrate prepared by molecular beam epitaxy

Systematic characterization of upper critical fields for MgB₂thin films by means of the two-band superconducting theory

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Transmission electron microscopy study of as-grown MgB2 films

Cited by 8 publications

References 15 publications

Microstructure of MgB 2 superconducting wire prepared by internal magnesium diffusion and in-situ powder-in-tube processes – Secondary phase intergrain nanolayers as an oxygen content indicator

Microstructure of MgB 2 superconducting wire prepared by internal magnesium diffusion and in-situ powder-in-tube processes – Secondary phase intergrain nanolayers as an oxygen content indicator

Flux pinning properties of MgB2 thin films on Ti buffered substrate prepared by molecular beam epitaxy

Systematic characterization of upper critical fields for MgB2thin films by means of the two-band superconducting theory

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Product

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Systematic characterization of upper critical fields for MgB₂thin films by means of the two-band superconducting theory