Tuning superconductivity by carrier injection

Koval, Yuri; Jin, Xiaoyue; Bergmann, Christoph; Simsek, Yilmaz; Özyüzer, Lütfi; Müller, Paul; Wang, Huabing; Behr, Günter; Büchner, Bernd
February 2010
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082507
Academic Journal
We have found that by extensive current injection along the c-axis, the superconducting properties of Bi2Sr2CaCu2O8+δ can be changed effectively. We show that critical temperature, c-axis resistivity, and critical current of intrinsic Josephson junctions can be tuned in a large range from underdoping to extreme overdoping. This effect is reversible and persistent. Our results can be explained by trapping charges in the insulating layers, which induce a change of carrier concentration in superconducting planes. This floating gate concept can be a general property of layered materials where the insulating charge reservoir layers are separated from the conducting planes.


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