The true pinning force range in Bi2Sr2CaCu2O8 + d single crystals at low temperatures

V. F. CORREA; G. NIEVA; H. PASTORIZA; F. DE LA CRUZ

PHYSICA C - SUPERCONDUTIVITY

ELSEVIER SCIENCE BV

Año: 2004 vol. 408 p. 531 - 532

0921-4534

We study the e.ective pro.le of the pinning potential well in Bi2Sr2CaCu2O8+d single crystals using transverse ac magnetic susceptibility. The results show that the harmonic approximation for the potential well (linear regime) is valid up to vortex displacements r n, where n is the coherence length. In spite of this, it is necessary to induce displacements of the vortex structure much larger than n to depin it from its potential. This is shown to take place even in the single vortex limit. vortex limit. of the vortex structure much larger than n to depin it from its potential. This is shown to take place even in the single vortex limit. vortex limit. magnetic susceptibility. The results show that the harmonic approximation for the potential well (linear regime) is valid up to vortex displacements r n, where n is the coherence length. In spite of this, it is necessary to induce displacements of the vortex structure much larger than n to depin it from its potential. This is shown to take place even in the single vortex limit. vortex limit. of the vortex structure much larger than n to depin it from its potential. This is shown to take place even in the single vortex limit. vortex limit.