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ZhETF, Vol. 119, No. 5, p. 987 (May 2001)
(English translation - JETP, Vol. 92, No. 5, p. 858, May 2001 available online at www.springer.com )

THE INSTABILITY POINT Hs OF THE MEISSNER STATE FOR LARGE-\kappa SUPERCONDUCTORS
Ovchinnikov Yu.N.

Received: January 2, 2001

PACS: 74.40.+k

DJVU (84.5K) PDF (266.7K)

The critical field Hs corresponding to the emergence of vortices in a superconductor without a threshold is found near the transition temperature and in limit as T\to 0 for an arbitrary value of the depairing factor Γ. In superconductors of the second kind, this field value coincides with the absolute instability point of the Meissner state. In large-κ superconductors, the order parameter tends to zero on the surface of the superconductor if the external magnetic field reaches the value Hs. We obtain that Hs=Hcm (where Hcm is the thermodynamic critical field) for an arbitrary value of the depairing factor Γ in the temperature region near Tc and at T=0.

 
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