Laser ablated bismuth cuprate thin films preparation and effect of oxygen nonstoichiometry upon superconductivity

✍ Scribed by T. Brousse; G. Poullain; J.F. Hamet; H. Murray; B. Raveau

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 651 KB
• Volume: 170
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90027-c

✦ Synopsis

Thin films of Bi,Sr,CaCuzOs and (Bi, Pb)2SrZCaZCu3010 have been prepared on monocrystalline ( 100) MgO substrates, using a laser ablation method with post annealing treatment. The influence of substrate temperature and oxygen pressure during deposition were investigated.

SEM observations, EDS analysis, electric and magnetic measurements have been used to characterize the films. Superconducting "2212" films, with T,(R=O) at 80-83 K and J, (50 K) up to 5 x 10' A/cm*, have been currently achieved, while Pb-doped "2223" films exhibit T, as high as I 10 K with J,= 5 x lo4 A/cm* at 77 K. The effect of annealing at low temperature (350°C) in an argon flow has been studied for the 22 12 phase, it shows the influence of the oxygen non-stoichiometry, i.e. of the hole carrier density upon Te's which can be measured up to 89 K (zero resistance).