Magnetic relaxation in partly penetrated critical states of type-II superconductors

I. M. Babich; G. P. Mikitik; E. H. Brandt

doi:10.1103/PhysRevB.68.052509

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Magnetic relaxation in partly penetrated critical states of type-II superconductors

I. M. Babich, G. P. Mikitik, E. H. Brandt

DOI 10.1103/PhysRevB.68.052509 · Physical Review B

T1

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Abstract

Magnetic relaxation in a thin flat type-II superconductor of arbitrary shape placed in an external magnetic field perpendicular to its plane is analyzed in the general case when flux penetration is not necessarily complete. We derive an expression for the magnetic relaxation rate that generalizes the well-known formula of Beasley et al. obtained for superconductors in the fully penetrated critical state. Our result allows one to extract the effective height of the activation barrier from experimental data even when the critical state has a complicated structure, in particular when the applied magnetic field is less than the field of full flux penetration into the sample.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown