Irreversibility field and superconducting screening currents in EuBa[sub 2]Cu[sub 3]O[sub 7] films

Senapati, K.; Sahoo, Leena K.; Pandey, N. K.; Budhani, R. C.
January 2002
Applied Physics Letters;1/28/2002, Vol. 80 Issue 4, p619
Academic Journal
Measurements of the critical current density (J[sub c]) and irreversibility field [B[sub irr](T)] of epitaxial, c-axis-oriented EuBa[sub 2]Cu[sub 3]O[sub 7] (Eu-123) films are reported. The transition temperature (T[sub c]), J[sub c], and B[sub irr](T) of these pulsed-laser-deposited films depend critically on the growth temperature (T[sub D]), growth rate (G[sub r]), and the oxygen partial pressure (pO[sub 2]) during growth. As compared to YBa[sub 2]Cu[sub 3]O[sub 7], Eu-based films require lower G[sub r], higher pO[sub 2], and higher T[sub D]. These differences are attributed to the lower adatom mobility of Eu and its propensity for a 2+ oxidation state. The lattice mismatch between (100) LaAlO[sub 3] and the ab-plane of Eu-123 leads to an elongated c axis and some randomly oriented islands whose growth is truncated by epitaxial lateral overgrowth as the film thickness increases. © 2002 American Institute of Physics.


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