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Superconducting weak bonds at grain boundaries in MgB2

Mikhail Tarasov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Evgeni Stepantsov ; Michio Naito ; A. Tsukada ; Dag Winkler (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Alexei Kalaboukhov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; M.Yu. Kupriyanov
JETP Letters (0021-3640). Vol. 105 (2007), 3, p. 636-641.
[Artikel, refereegranskad vetenskaplig]

The possibility of preparing bicrystalline Josephson junctions and bolometers based on superconducting MgB2 on specially prepared bicrystalline MgO substrates is investigated. Microbridges 0.85–6.00 μm in width, intersecting the bicrystalline interface, are formed in epitaxial bicrystalline MgB2 films grown on these substrates. It is found that annealing of bicrystalline samples in oxygen leads to a systematic decrease in the critical current, an increase in the temperature width of the superconducting transition region, and to an improvement of the current-voltage (IV) characteristic, which becomes close in shape to the IV characteristic of a Josephson junction. The response of such a junction to radiation at a frequency of 110 GHz with an amplitude attaining 0.5 mV is measured.

Nyckelord: MgB2, superconductivity, weak links

Denna post skapades 2007-12-18. Senast ändrad 2015-12-17.
CPL Pubid: 63444


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik



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