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Vortex gliding between Cu–O planes in an anisotropic high temperature superconductor (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)

Durán, C. A. ; Gammel, P. L. ; Bishop, D. J.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 6592-6592

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The magnetooptical technique was used to directly observe the magnetic flux penetration in single crystals of the La–Sr–Cu–O superconductor. The large size of the crystals (several millimeters along the three axes) allows for observations to be made along the different crystalline orientations. In a previous study, we reported on direct measurements of critical currents and the dependence of their anisotropy on the amount of Sr doping. When looking at the behavior of vortices which are parallel to the Cu–O planes, we observed that the roughness of the flux fronts was greatly magnified for the highly anisotropic samples. This suggested that the vortices were moving between the planes, as if they were in independent channels. In this communication, we report on observations made when an additional field component is applied along the c axis. Our experiments show that this additional component strongly suppresses the vortex penetration, drastically reducing the apparent anisotropy of the critical currents. We argue that this behavior is consistent with a picture in which the vortices easily move ("glide'') between the Cu–O planes, and only feel the pinning potential when they are tilted by the additional field component, and thus forced to "puncture'' the planes. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.361953

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Real-time imaging of the magnetic flux distribution in superconducting YBa 2 Cu 3 O 7−δ (1992)

Durán, C. A. ; Gammel, P. L. ; Wolfe, R. ; [et al.]

[s.l.] : Nature Publishing Group

Nature 357 (1992), S. 474-477

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] Our apparatus is shown schematically in Fig. 1. We use a bismuth- and gallium-doped yttrium-iron-garnet (YIG) film placed close to the superconductor4'6. The magnetic response of the garnet and hence of the superconductor is probed using polarized light in an optical microscope, whose output is ...