Polaronic quasiparticle injection in organic copper (II) phthalocyanine/Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+δ] tunnel junctions

Kim, Sunmi; E, Jungyoon; Lee, Kiejin; Ishibashi, Takayuki; Sato, Katsuaki; Friedman, Barry
April 2002
Applied Physics Letters;4/8/2002, Vol. 80 Issue 14, p2526
Academic Journal
We report the current transport properties of an organic conductor/superconductor tunnel junction as a high-T[sub c] superconducting three terminal device. The organic copper (II) phthalocyanine (Cu–Pc) layer was used for a polaronic quasiparticle (QP) injector. The junction was investigated in the dark and under ultraviolet radiation. The injection of polaronic QP from the Cu–Pc interlayer into a superconductor Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+δ] (BSCCO) thin film generated a substantially larger nonequilibrium effect as compared to the normal QP injection current. The tunneling spectroscopy of a Cu–Pc/BSCCO junction exhibited a zero bias conductance peak, which may be interpreted as Andreev reflection at a Cu–Pc/d-wave superconductor junction. © 2002 American Institute of Physics.


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