Electrical and Structural Properties of Ex-situ Annealed Superconducting Bi2Sr2CaCu2O8 Thin Films Obtained by Coevaporation of Components

BAŞTÜRK N.

TURKISH JOURNAL OF PHYSICS, cilt.29, sa.2, ss.115-118, 2005 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 29 Sayı: 2
  • Basım Tarihi: 2005
  • Dergi Adı: TURKISH JOURNAL OF PHYSICS
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.115-118
  • Hacettepe Üniversitesi Adresli: Evet

Özet

Bi2Sr2CaCu2O8 system superconducting thin films were obtained by synchronized deposition of Bi, Cu, CaF2 and SrF2 components onto cleaved MgO (100) single crystal substrates after annealing in the temperature range 600-840 degrees C. The films were annealed in H2O and O-2, then dry O-2 atmosphere for the removal of fluorine from the structure and to attain superconducting properties. X-ray powder diffraction patterns were used to characterize the obtained film structure. The films were observed to grow along c-axis perpendicular to the substrate surface with the identified reflection on the (00l, l = 6, 8, 10 ...) planes. The films having the critical temperature higher than liquid nitrogen were obtained when Bi and the other components were evaporated from separate sources. DC resistance in the films were measured in the temperature range 77-300 K. of those films having good superconducting properties, metallic behaviors were seen in the normal state and zero resistance at 79 K was obtained following a transition in the resistance.