The magnetic field created by a vortex line located near a macroscopic spherical cavity as well as the ma.gnetic field within the superconductor are calculated by solving London equations using the generalized spherical function technique. The interaction energy between the flux line and the cavity and consequently the pinning force are also calculated. It is shown that one possible cause of the pinning is that an attractive image force exists a t the superconductor sphere boundary.Sowohl das durch eine in der NLhe eines makroskopischen spharischen Hohlraums lokalisierte Wirbellinie hervorgerufene magnetische Feld als auch daa magnetische Feld innerhalb des Supraleiters werden durch Losung der Londongleichungen mit der Technik der verallgemeinerten spharischen Funktion berechnet. Die Wechselwirkungsenergie zwischen der FluBlinie und dem Hohlraum und folglich die Anhaftkraft werden ebenfalls berechnet. Es wird gezeigt, daB ein moglicher Grund fur das Anhaften die Existenz einer anziehenden Bildkraft an der SupraleiterKugelgrenze ist.
A phenomenological study in d-spatial dimensions is presented for the coexistence of planar antiferromagnetism and type H superconductivity. In this approach critical temperatures in the range 30-1 O0 K arise due to the proposed coupling of magnons and conduction electron pairs. We discuss some remarkable features of oxide ceramics, including a longer London penetration depth, shorter coherence length, lower Hol, higher He2, large current densities, and large pinning force.
Using the critical state model, the structure of surface flux pinning in a type II superconducting slab of finite thickness is studied. The surface barrier disappears when the external field approaches a superheating field. The flux lines (FLs) metastable state appears when the external field reaches a supercooling field. The critical superheating and the supercooling fields depend on the applied field orientation and the self field generated by a transport current flowing through the slab.
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