Investigation of In-Field Properties of YBCO Film with Artificial Pinning Centers
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0946-HH08-10
Investigation of In-Field Properties of YBCO Film with Artificial Pinning Centers Hiroyoshi Kobayashi1, Satoru Ishida1, Kazuhiro Takahashi1, Masaya Konishi1, Akira Ibi1, Seiki Miyata1, Yutaka Yamada1, Yuh Shiohara2, Takeharu Kato3, and Tsukasa Hirayama3 1 SRL-Nagoya, ISTEC, 4-1,MUTSUNO 2-CHOME,ATSUTA-KU, NAGOYA, AICHI, 456-8587, Japan 2 SRL, ISTEC, 4-1,MUTSUNO 2-CHOME,ATSUTA-KU, TOKYO, 135-0062, Japan 3 SRL-Nagoya, JFCC, 4-1,MUTSUNO 2-CHOME,ATSUTA-KU, NAGOYA, AICHI, 456-8587, Japan ABSTRACT We have investigated the thickness dependence of critical current for YBa2Cu3O7-x (YBCO) film with artificial pinning centers on metallic substrate. Artificial pinning centers were introduced by the pulsed laser deposition (PLD) using YBCO target including YSZ particles. The film over 1 µm in thickness exhibited with high critical current (Ic) of 40.7A in applied magnetic field of 3T parallel to the c-axis at 77K. This value was 5 times as high as the normal YBCO film without artificial pinning centers. The large Ic enabled us to approach to a practical application in the near future. Furthermore, it was clarified that the columnar nano-structure formed in the film, we call the bamboo structure , was a dominant pinning center because each Jc- curve of all thick films formed a universal line by the normalization of Jc. In addition, it was also found that YSZ addition has an optimal concentration for pinning by the study of YSZ concentration in the film.
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INTRODUCTION
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Recently, characteristics of long YBa2Cu3O7-x (YBCO) coated conductor using metallic substrate have been rapidly improved. The Ic L value has exceeded over 50,000Am [1]. However, the YBCO coated conductor exhibited a decrease of critical current density (Jc) in a magnetic field. For a practical use, the improvement of the in-field properties should be required. For this purpose, various attempts have been intensively tried to improve the in-field properties [2]. Among them, the introduction of artificial pinning centers using oxide particles into YBCO coated conductor is one of the effective methods. Until now, many results using single crystal, RABiTS and ion-beam assisted deposition (IBAD)-MgO as substrates are reported [3-5]. In our laboratory we have improved the in-field properties by the introduction of artificial pinning centers into YBCO coated conductor made by the pulsed laser deposition (PLD) method. In this method YBCO target with YSZ particles and PLD-CeO2 / IBAD-GZO / Hastelloy metal tapes were used[6-7]. Moreover, we have also found that the columnar microstructure, which formed BZO/YBCO stacked layers was effective for pinning. We call this structure the bamboo structure from its anisotropic growth and morphology. [8-10] In this study in order to improve Ic value further, we have fabricated thick YBCO films with the artificial pinning centers. Furthermore, we have studied the effect of YSZ particle concentrations to find a optimal density of the bamboo structure for pinning.
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EXPERIMENTAL DETAILS YBCO films with artifi
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