Angular dependence of critical current density of SmBCO coated conductor fabricated by co-evaporation method was investigated. For comparison, three samples were fabricated by a co-evaporation method and one sample was fabricated by a pulsed laser deposition process. The deposition system, named EDD...
Angular dependence of critical current density of SmBCO coated conductor fabricated by co-evaporation method was investigated. For comparison, three samples were fabricated by a co-evaporation method and one sample was fabricated by a pulsed laser deposition process. The deposition system, named EDDC (Evaporation using Drum in Dual Chambers), is a batch type co-evaporation system, which is composed of reaction chamber and evaporation chamber. The normalized critical current density ratio ($I_c/I_c$(H//ab-plane)) of EDDC-SmBCO samples was found to be higher than that of PLD-YBCO sample in the whole range of angle. While the EDDC-SmBCO samples evidently had a peak at the angle of H//c-axis in the plot of the angular dependence of critical current, the normalized critical current of PLD-YBCO sample decreased monotonically without any peak as angle increased. The field dependence of critical current under the magnetic field parallel to the normal direction of those samples showed similar aspect in the range of $0\;G{\sim}5000\;G$.
Angular dependence of critical current density of SmBCO coated conductor fabricated by co-evaporation method was investigated. For comparison, three samples were fabricated by a co-evaporation method and one sample was fabricated by a pulsed laser deposition process. The deposition system, named EDDC (Evaporation using Drum in Dual Chambers), is a batch type co-evaporation system, which is composed of reaction chamber and evaporation chamber. The normalized critical current density ratio ($I_c/I_c$(H//ab-plane)) of EDDC-SmBCO samples was found to be higher than that of PLD-YBCO sample in the whole range of angle. While the EDDC-SmBCO samples evidently had a peak at the angle of H//c-axis in the plot of the angular dependence of critical current, the normalized critical current of PLD-YBCO sample decreased monotonically without any peak as angle increased. The field dependence of critical current under the magnetic field parallel to the normal direction of those samples showed similar aspect in the range of $0\;G{\sim}5000\;G$.
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가설 설정
If the EDDC system is scaled up, the production rate will be faster in proportion to the size of drum. 2) EDDC system has the possibility of in-situ deposition processing for the superconducting coated conductor of multi layer structure. When the temperature of the drum is raised to the processing temperature, the composing layers can be deposited in series.
제안 방법
In this paper, the detailed structure of EDDC system was described and the angular field dependence of critical current of SmBCO coated conductor was investigated using samples fabricated by EDDC and PLD for comparison, and the field dependences of critical current of those samples with the magnetic field parallel to the normal direction of them were investigated.
성능/효과
We adopted evaporation technique and developed EDDC (Evaporation using Drum in Dual Chambers) system [ 1 -2] that is a batch type co-evaporation system. EDDC system has the following advantages: 1) The production rate is fast. In EDDC system, there is a drum on which a hundred meter long tape can be wound up to deposit superconducting materials.
Therefore, the total time to get a finished product can be reduced by means of omitting the time of pumping for respective layers, transferring tapes from one chamber to the other chamber, increasing temperature and cooling down temperature etc. 3) EDDC system uses metallic sources that are cheaper and more easily transformed into desired shapes than ceramic target and organic metal. They will result in not only reducing the cost ofCC production but also increasing production speed.
The results indicate that EDDC-SmBCO samples have less anisotropic Jc compared with YBCO-PLD sample under the magnetic field of 5000 G, and EDDC fabrication method have a potential of self c-axis corelated pinning center formation without any additional process such as adding impurity in the film, using ISD template, ion irradiation, etc.
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