Title :
Preparation and properties of high T/sub c/ superconducting YBa/sub 2/Cu/sub 3/O/sub 7/ and ferromagnetic oxide La/sub 0.67/Ba/sub 0.33/MnO/sub 3/ multilayers
Author :
Xiong, G.C. ; Li, Q. ; Ju, H. ; Greene, R.L. ; Venkatesan, T.
Author_Institution :
Center for Supercond. Res., Maryland Univ., College Park, MD, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
We have prepared superconducting YBa/sub 2/Cu/sub 3/O/sub 7/ and ferromagnetic oxide La/sub 0.67/Ba/sub 0.33/MnO/sub 3/ hetero-epitaxial multilayer samples by pulsed laser deposition. X-ray diffraction and ion channeling results indicate that epitaxial growth of ferromagnetic La/sub 0.67/Ba/sub 0.33/MnO/sub 3/ films has been achieved on (100) LaAlO/sub 3/ substrates. In situ epitaxial La/sub 0.67/Ba/sub 0.33/MnO/sub 3/ thin films show giant negative magnetoresistance around 150 K and a magnetoresistance ratio, -(R/sub H/-R/sub 0/)/R/sub 0/, of more than 90%. A superconducting transition and the magnetoresistance effect were observed in YBa/sub 2/Cu/sub 3/O/sub 7//La/sub 0.67/Ba/sub 0.33/MnO/sub 3/ multilayers simultaneously. The results suggest the possibility of an interface effect, which affects the resistivity and the superconductivity of the multilayers.<>
Keywords :
X-ray diffraction; barium compounds; channelling; ferromagnetic materials; giant magnetoresistance; high-temperature superconductors; lanthanum compounds; magnetic epitaxial layers; magnetic multilayers; magnetoresistance; pulsed laser deposition; superconducting epitaxial layers; yttrium compounds; (100) LaAlO/sub 3/ substrates; 150 K; LaAlO/sub 3/; X-ray diffraction; YBa/sub 2/Cu/sub 3/O/sub 7/-La/sub 0.67/Ba/sub 0.33/MnO/sub 3/; YBa/sub 2/Cu/sub 3/O/sub 7//La/sub 0.68/Ba/sub 0.33/MnO/sub 3/; ferromagnetic oxide; giant negative magnetoresistance; heteroepitaxial multilayer; high T/sub c/ superconductor; interface effect; ion channeling; preparation; pulsed laser deposition; superconducting transition; Epitaxial growth; Giant magnetoresistance; Nonhomogeneous media; Optical pulses; Pulsed laser deposition; Substrates; Superconducting epitaxial layers; Superconducting thin films; X-ray diffraction; X-ray lasers;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
