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Please use this identifier to cite or link to this item: https://elib.bsu.by/handle/123456789/206562
Title: Повышение критического тока сверхпроводника легированием элементами в плазме низкого давления
Other Titles: Enhancement of critical current in superconductor by element implantation in low-pressurized plasma / A.Zh.Tuleushev, Yu.ZhTuIeushev, V.N.Lisitsyn, S.N.Kim, V.N.Volodin, A.B.Asanov
Authors: Тулеушев, А. Ж.
Тулеушев, Ю. Ж.
Лисицын, В. Н.
Ким, С. Н.
Володин, В. Н.
Асанов, А. Б.
Issue Date: 1999
Publisher: Минск : БГУ
Citation: Взаимодействие излучений с твердым телом: Материалы III междунар. науч. конф., 6-8 окт. 1999 г., Минск: В 2 ч. Ч.2. — Мн.: БГУ, 1999. — С. 96-98.
Abstract: Предложен и реализован метод легирования сверхпроводника элементами, несмешивающимися и не образующими промежуточных соединений, на примере систем Pb-Be и Pb-Al. Имплантацией элементов в матрицу свинца при распылении соответствующих мишеней в плазме низкого давления и последующем формировании композиции получены образцы сверхпроводящих пленочных покрытий, сохраняющих температуру критического перехода свинца при повышении на несколько порядков величины критического тока, составившей в присутствии бериллия (3,1- 3,6)- 1041 алюминия - (2,3-2,5)- 105АУ см2.
Abstract (in another language): The processes of superconductor formation and doping have been implemented by means of synchronous sputtering the cooled target-cathodes made of appropriate high-purity metals (99.99 mass %) at the planar direct-current magnetrons accompanied by deposition of the superconductor film onto the copper foil that moves with respect to plasma flow. The superconductor has been formed by alternating deposition of the layers of lead and a doping element of the thickness 0.3 to 0.6 nm each up to the total value of 0.3 to 1.2 microns. The speed of motion of the belt having the thickness pointed above comprises 3.6 to 4 m/hour. The X-ray studies of the superconductor sample have shown that the deposited lead-aluminum coating is represnted by two phases lead and aluminum with undistorted crystalline lattices which correspond to the table values. Leads in the deposited layer represents the well crystallized phase with the grain size greater than 1000 Л; texture hasn't been revealed. Also the line series of copper - the foil material - presents; its microcrystals are oriented in the (220) plane Due to low intensity of the beryllium lines against the lead background caused by large difference in the atomic weights, the X-ray analysis of the lead­beryllium film has turned out impossible. The thickness and the composition of the superconductor film formed on the belt copper substrate of the thickness 20 microns and the width up to 20 mm have been determined by the technique of Rutherford backscattering at the proton beam energy comprising 500 keV - for lead doped by beryllium and 1 MeV1 at the electrostatic accelerator UKP-2-1. The samples of the film superconductor doped by beryllium (5.45 mass %) having the width 0.5 mm and the film thickness 280 nm and those doped by aluminum (12.8 mass %) having the width 1 mm and the thickness 1.2 microns have been subject to cryogenic tests. The critical temperature of the transition to a superconductivity state is the same for both systems and, practically, doesn’t differ from that for pure lead. Considerable multiple increase of the critical current in both samples and, especially, in the case of lead doping by aluminum, attracts attention. The value of Ic for the Pb-Be conductor comprises (3.1-3.6)-104 А/cm2, and for the Pb-Al one - (2.3-2.5)- 10s А/cm2, being compared with similar characteristics of the industrial technical semiconductors: NbTi -(3-8) 104 and Nb3S n-(1-8)- 105A/cm2. Usage of the material sputtering in low-pressurized plasma with implantation of the doping element particles into superconductor matrix being in relatively ordered state witnesses on wide capabilities of magnetron processes in the technologies for formation of superconductor, compared to others, and can be used for variation of the critical characteristics of other superconductors.
URI: http://elib.bsu.by/handle/123456789/206562
ISBN: 985-445-237-9
Appears in Collections:1999. Взаимодействие излучений с твердым телом

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