Direct visualization of local interaction forces in Bi2Sr2CaCu2O8+δ vortex matter

J. ARAGÓN SÁNCHEZ; R. CORTÉS MALDONADO; M. I. DOLZ; N. R. CEJAS BOLECEK; C. J. VAN DER BEEK; M. KONCZYKOWSKI; Y. FASANO

Materials Today: Proceedings

Elsevier

Año: 2019 vol. 14 p. 34 - 37

2214-7853

We study the local vortex-vortex interaction force f i of the structure frozen during a field-cooling process in an electron-irradiatedBi 2 Sr 2 CaCu 2 O 8+ sample. We compute this magnitude from snapshots of the vortex structure obtained via magnetic decorationexperiments at various fields H in the same sample. Since the observed structures correspond to the equilibrium ones frozen atT~T irr (H) [1], at this temperature the local modulus of f i roughly equals the local pinning force at the decorated surface of thesample. We estimate the most probable local pinning force from the mode value of the f i (r) distribution, f pm . We found that f pmgrows algebraically with H and in electron-irradiated samples is 50-20% smaller than for samples with columnar defects.