We have used scanning SQUID magnetometry to image vortices in ultrathin (Ba(0.9)Nd(0.1)CuO(2+x))(m)/(CaCuO(2))(n) high temperature superconductor samples, with as few as three superconducting CuO(2) planes. The Pearl lengths (Lambda=2lambda(L)(2)/d, lambda(L) 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 lambda(ab) 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.

Magnetic imaging of pearl vortices in artificially layered (Ba(0.9)Nd(0.1)CuO(2+x))(m)/(CaCuO(2))(n) systems

POrgiani;
2004

Abstract

We have used scanning SQUID magnetometry to image vortices in ultrathin (Ba(0.9)Nd(0.1)CuO(2+x))(m)/(CaCuO(2))(n) high temperature superconductor samples, with as few as three superconducting CuO(2) planes. The Pearl lengths (Lambda=2lambda(L)(2)/d, lambda(L) 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 lambda(ab) 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
INFM
INPLANE PENETRATION DEPTH
SQUID MICROSCOPE
SUPERCONDUCTORS
CRYSTALS
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/165126
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