TITLE

The role of a superconducting seed layer in the structural and transport properties of EuBa[sub 2]Cu[sub 3]O[sub 7-x] films

AUTHOR(S)
Jia, Q. X.; Foltyn, S. R.; Arendt, P. N.; H. Wang; MacManus-Driscoll, J. L.; Coulter, Y.; Venkataraman, K.; Maroni, V. A.
PUB. DATE
August 2003
SOURCE
Applied Physics Letters;8/18/2003, Vol. 83 Issue 7, p1388
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the structural and transport properties of EuBa[sub 2]Cu[sub 3]O[sub 7-x] (Eu123) films on SrTiO[sub 3] substrates. A substrate temperature 100 °C higher than that used to deposit YBa[sub 2]Cu[sub 3]O[sub 7-x] (Y123) is needed to grow high-performance Eu123 films directly on SrTiO[sub 3] substrates. However, this high-temperature restriction can be circumvented by inserting a seed layer (∼12 nm) of Y123, Gd123, or Dy123 between the substrate and the Eu123. A structural analysis reveals that a transition region that promotes the growth of the a-axis is first formed on the surface of the substrate if the Eu123 is deposited directly on SrTiO[sub 3] at a temperature of less than 800 °C. On the other hand, the use of a seed layer of another superconducting material restructures the Eu123 to the right phase without forming this transition region. Eu123 films with critical temperatures of 94 K and critical current densities of 5.8×10[sup 6] A/cm[sup 2] at 75.5 K have been deposited under standard deposition conditions using such an approach. © 2003 American Institute of Physics.
ACCESSION #
10543229

 

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