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Monte Carlo Study of a Periodically Pinned 2D Superconductor

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Rezlescu N., Anghelache R., Ciobotaru I.

Acta Physica Polonica A

1997

vol. 91

issue 2

337-340

We show that a natural assumption on the moving mechanism of vortices in a periodically pinned, two-dimensional superconductor in the mixed state is the basis for a n-clock-like model. The pinning points are considered to be centered in each unit cell of the superconducting lattice. This property enables one to use a discrete version of the XY model used in the simulations focusing on the melting of the Abrikosov lattice of vortices in a system of Josephson arrays. A Monte Carlo study performed on the corresponding Hamiltonian in a field given by a filling factor of f=1/2 exhibits two phase transitions, at the temperatures T_{c1}≈0.325 and T_{m}≈0.65. The numerical estimation of the Challa parameters for both transitions indicates their continuous nature. The physical meaning of the lower transition is the expulsion of the magnetic field from the superconducting system, i.e. the Meissner effect. The physical equivalent of the upper transition is the melting of the pinned vortex lattice.

Magnetostatic Energy Associated with Variation of Local Magnetization Direction in Field Annealed Amorphous Ribbons

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Ciobotaru I., Rezlescu N., Anghelache R.

Acta Physica Polonica A

1997

vol. 91

issue 2

427-430

It is shown that in field annealed amorphous ribbons (with oblique intrinsic anisotropy), the magnetostatic energy associated with spatial fluctuations of the local magnetization depends on the magnetization state. The corresponding magnetostatic interactions can play an important part in the magnetic behaviour of the amorphous ribbons with small macroscopic anisotropy.

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2 Acta Physica Polonica A

2 1997

2 Anghelache R.

2 Ciobotaru I.

2 Rezlescu N.

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Monte Carlo Study of a Periodically Pinned 2D Superconductor

Magnetostatic Energy Associated with Variation of Local Magnetization Direction in Field Annealed Amorphous Ribbons