Surface morphology of (Hg,Re)Ba2CaCu2Oy thin films prepared by pulsed laser deposition

J. H. Su, P. V.P.S.S. Sastry, J. Schwartz

Research output: Contribution to journalConference article

Abstract

(Hg,Re)Ba2CaCu2Oy thin films have been fabricated on (100) LaAlO3 by reacting laser deposited Re0.2Ba2CaCu2Oy precursor films with CaHgO2 in sealed quartz tubes at 780°C for times ranging between 0 h -16 h. The films reacted for more than 2 h exhibit high phase purity (Hg,Re)-1212 and good c-axis texture. Scanning electron microscopy and x-ray diffraction studies showed the existence of small amounts of a-axis oriented grains in all the reacted films. The root-mean-square roughness, measured by atomic force microscopy (AFM), increases initially with increase in heat treatment duration and saturates at ∼ 300 nm after 4 h. The evolution of the surface roughness can be partially explained with a high nucleation density and the appearance of a three-dimensional structure during the initial stages of film growth and crystal coalescence at further growth. Two-dimensional planar growth with a one-unit-cell growth unit in the c direction was observed by AFM.

Original languageEnglish (US)
Pages (from-to)2809-2812
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume13
Issue number2 III
DOIs
StatePublished - Jun 1 2003
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: Aug 4 2002Aug 9 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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