Enhancement of critical current by post-annealing of thin YBCO films prepared by laser ablation from a nanocrystalline target



: Huhtinen H, Paturi P, Lahderanta E

Publisher: V S V CO. LTD

: 1999

Physics of Low-Dimensional Structures

PHYSICS OF LOW-DIMENSIONAL STRUCTURES

: PHYS LOW-DIMENS STR

: 9-10

: 25

: 37

: 13

: 0204-3467


Influence of post-annealing oil surface morphology and superconducting properties of thin YBCO films prepared by laser ablation from a. nanocrystalline target is investigated. Annealing of the films in slowly flowing oxygen at the optimum temperature of 900 degrees C increases the superconducting transition temperature T-c at best from 82 K (as-deposited film) to 90 K (annealed film). Also the critical current density rises remarkably during annealing, reaching the value of J(c) approximate to 1.4 x 10(7) A/cm(2) at 77 It in zero magnetic field; A plausible mechanism is discussed for explanation of these observations. The main surface defects found on the annealed films are a few large particles and holes. Between these defects the rms smoothness of the surface is 3.6 nm.



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