Details

Autor(en) / Beteiligte

• Jung, Yong Hwan
• Lim, Sunme
• Yoo, Jaeun
• Lee, Sang Moo
• Jung, Yehyun
• Lee, Jae Young
• Youm, Dojun
• Oh, Sangjun

Titel

Critical Currents at the Grain Boundary of Sm sub(1)Ba sub(2)Cu sub(3)O sub(7- delta ) Film Under Oblique Magnetic Fields

Ist Teil von

• IEEE transactions on applied superconductivity, 2007-01, Vol.17 (2)

Erscheinungsjahr

2007

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• We measured critical current densities (J sub(cb)) at a [001]-tilt grain boundary (GB) of a bicrystalline Sm sub(1)Ba sub(2)Cu sub(3)O sub(7) film under various magnetic fields (Halpha) applied obliquely. The mis-orientation angle, thetas, of the [001] tilt GB was 30deg. Halpha was varied between -0.65 KOe and +0.65 KOe. The angle, phi, between the applied fields and the film surface was varied from 0deg to 90deg. The curves of J sub(cb) vs. H sub(alpha) at the different phi s were qualitatively explained by a simple formula suggested in [8]. The formula was expressed by multiplication of the two factors which include the effects of Hperp and H sub(par). One fitting parameter, alpha, in this formula was large for the sample of thetas = 30deg in our previous paper. On the contrast, alpha for the present sample in this paper is almost zero. The absolute values of J sub(cb) for this sample are larger than those for the previous sample by one order of magnitude. These results indicate that the parameter, alpha, closely related to the quality of GB: alpha gets smaller as the film quality at GB become better.