Vortices and Nanostructured Superconductors by Adrian Crisan

Author:Adrian Crisan
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Following on from this work, the same authors and others have used scaling to quantify the effects of nanostructuring on critical currents. Also using metal-organic deposition (MOD) as the fabrication technique, self-assembled nanowires of Ce0.9Gd0.1O2-y (CGO) or nanoislands of (La,Sr)Ox can be prepared on single crystal substrates, [17]. Both surface modifications are shown to induce extended c-axis defects leading to an increase in critical currents for H//c. Using the scaling, the ratio of anisotropic pinning to total current over the (H, T) region is shown in Fig. 4.4 for the sample with LSO nanodots . Of note is the weak field dependence of the pinning. It appears the added c-axis pinning is quite effective to high fields, and is most effective at high temperatures. This is borne out by a direct comparison of the pinning engineered films with a pure YBCO reference film [17].

Fig. 4.4Vortex pinning phase diagram showing the ratio of anisotropic to total critical current for H//c over a range of field and temperature for a YBCO sample prepared on a substrate with a surface preparation of LSO nanoislands.

(Reprinted from Gutiérrez et al. [17] with permission)

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