Title :
Magnetic field splitting of the quasiparticle states in Nd-Ba-Cu-O/Pr-Ba-Cu-O/Nd-Ba-Cu-O planar junctions
Author :
Alvarez, G.A. ; Utagawa, T. ; Tanabe, K. ; Enomoto, Y.
Author_Institution :
Supercond. Res. Lab., ISTEC, Tokyo, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
We report on high quality planar junctions fabricated from well characterized c-axis quasi-homoepitaxial NdB/sub 2/Cu/sub 3/O/sub 7-/spl delta///PrB/sub 2/Cu/sub 3/O/sub 7-/spl delta/// NdBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//(NBCO/PBCO/NBCO) multilayers. C-axis axis tunneling spectroscopy investigations provide evidence of quasiparticle tunneling that is commonly observed for superconductor-insulator-superconductor (SIS) junctions. The tunneling conductance dI/dV of the junctions in parallel magnetic field reveals an anomalous splitting of the superconducting quasiparticle density of states. The magnitude of the splitting was found to be proportional to /spl mu//sub B/H and may be related to the magnetic moment of the quasiparticles.
Keywords :
barium compounds; high-temperature superconductors; neodymium compounds; praseodymium compounds; quasiparticles; superconducting epitaxial layers; superconductive tunnelling; Nd-Ba-Cu-O/Pr-Ba-Cu-O/Nd-Ba-Cu-O planar junction; NdBaCuO-PrBaCuO-NdBaCuO; high T/sub c/ superconductor; magnetic field splitting; magnetic moment; quasi-homoepitaxial multilayer; quasiparticle density of states; quasiparticle tunneling; tunneling conductance; tunneling spectroscopy; Atomic force microscopy; High temperature superconductors; Josephson junctions; Magnetic fields; Nonhomogeneous media; Superconducting devices; Superconducting transition temperature; Temperature dependence; Tunneling; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
