RT Journal Article
T1 Vortex liquid entanglement in irradiated YBa_2Cu_3O_7 thin films
A1 Sefrioui, Zouhair
A1 Arias, D.
A1 González Herrera, Elvira María
A1 León, C.
A1 Santamaría Sánchez-Barriga, Jacobo
A1 Vicent López, José Luis
AB Epitaxial YBa_2Cu_3O_7 thin films, grown by high-pressure de sputtering, an irradiated with He^(+) ions at 80 keV with doses between 10_(14) and 10_(15) cm^(-2). Irradiation reduces the critical temperature but it does not modify the carrier concentration. Angle- dependent resistivity is used to show that the mass anisotropy does not change upon irradiation. The melting transition in magnetic fields applied parallel to the c axis is analyzed by I-V critical scaling, and all irradiated and nonirradiated samples show a three- dimensional vortex glass transition with the same critical exponents. The dissipation in the liquid state is analyzed in terms of the activation energy of the magnetoresistance in a perpendicular magnetic field. While as-grown samples show an activation energy depending as 1/H on the applied magnetic field, irradiated samples show a dependence as 1/H^(0.5), characteristic of plastic deformation of vortices. This is discussed in terms of the point  disorder introduced by ion irradiation.
PB American Physical Society
SN 1098-0121
YR 2001
FD 2001-02-01
LK https://hdl.handle.net/20.500.14352/60176
UL https://hdl.handle.net/20.500.14352/60176
LA eng
NO ©2001 The American Physical Society.Financial support from CICYT Grant Nos. MAT94-0604, MAT97-0675, and MAT99-1706E is acknowledged. Z.S. thanks AECI for financial support.
NO CICYT
NO AECI
DS Docta Complutense
RD 25 dic 2025