Observation of vortex patterns and movement in Y-123 and Bi-2212 samples by means of the Bitter technique

Ohshima, Shigetoshi; Kawai, Takashi; Kanno, Shinsuke; Yamada, H.

doi:10.1016/s0921-4534(02)01010-9

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Sample Preparation and Experimental Procedures1

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2003

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“…The final temperature, , was varied between 25 K, 50 K and 75 K. We examined the relationship between the distribution and movement of the vortices and temperature. The detailed observation process was reported in a previous paper [10], [11]. Fig.…”

Section: Sample Preparation and Experimental Proceduresmentioning

confidence: 99%

Observation of vortex distribution in samples of Bi-2223 Ag-sheathed tapes with and without uranium doping by means of the high-resolution bitter method

Ohshima

Ujiie

Kawai

et al. 2003

IEEE Trans. Appl. Supercond.

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Abstract-We examined the distribution of vortices in both Bi-2223 Ag-sheathed tape and U-doped Bi-2223 Ag-sheathed tape applying the high-resolution Bitter method. In the low temperature region ( ), we found that the vortices in the undoped Bi-2223 Ag-sheathed tape developed into either a triangular arrangement or a heterogeneous arrangement along the grain boundaries of the Ag sheath, which form weak pinning centers. The vortex distribution for U-doped Bi-2223 samples was slightly different from the distribution for the undoped material. We observed some movement of the vortices in both the U-doped and the undoped Bi-2223 Ag-sheathed tapes at 50 K. At higher temperatures, 75 K, the vortices in the Bi-2223 tapes moved even faster so that no deposition pattern, indicating the location for vortices, formed.

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Section: Sample Preparation and Experimental Proceduresmentioning

confidence: 99%