INVESTIGADORES
FASANO Yanina
artículos
Título:
Porous vortex matter
Autor/es:
S. S. BANERJEE; A. SOIBEL; Y. MYASOEDOV; M. RAPPAPORT; E. ZELDOV; M. MENGHINI; YANINA FASANO; F. DE LA CRUZ; C. J. VAN DER BEEK; M. KONCZYKOWSKI; T. TAMEGAI
Revista:
PHYSICA C - SUPERCONDUTIVITY
Referencias:
Año: 2004 vol. 408 p. 495 - 498
ISSN:
0921-4534
Resumen:
Structure, dynamics, and thermodynamic properties of vortex matter in the presence of a low density of columnar defects (CDs) were studied in BSCCO crystals. Magnetic decorations show that when vortices outnumber CDs a heterogeneous vortex matter is formed consisting of two populations of vortices: vortices residing on CDs form a matrix of pinned vortices, whereas the interstitial vortices form ordered crystallites within the pores' of the matrix. Differential magneto-optical studies reveal that at elevated fields this porous phase melts in two stages, a first-order melting of the crystallites at a temperature considerably higher than the pristine melting, and a continuous melting of the matrix at still higher temperature. At low fields the two transitions occur simultaneously, giving rise to a sharp kink in the observed melting line.
