Phys. Rev. Lett. 92, 157006 (2004) [4 pages]Magnetic Imaging of Pearl Vortices in Artificially Layered (Ba0.9Nd0.1CuO2+x)m/(CaCuO2)n SystemsReceived 17 June 2003; published 16 April 2004 We have used scanning SQUID magnetometry to image vortices in ultrathin (Ba0.9Nd0.1CuO2+x)m/ (CaCuO2)n high temperature superconductor samples, with as few as three superconducting CuO2 planes. The Pearl lengths (Λ=2λL2/d, λL the London penetration depth, d the superconducting film thickness) in these samples, as determined by fits to the vortex images, agree with those by local susceptibility measurements, and can be as long as 1 mm. The in-plane penetration depths λab inferred from the Pearl lengths are longer than many bulk cuprates with comparable critical temperatures. We speculate on the causes of the long penetration depths, and on the possibility of exploiting the unique properties of these superconductors for basic experiments. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.157006
DOI:
10.1103/PhysRevLett.92.157006
PACS:
74.72.–h, 73.40.Gk, 73.40.Rw, 74.50.+r
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