Single electron effects and Bloch oscillations in high-TC superconductive tunneling junctions | Zendy

G.A. Alvarez | Zendy; Xiaolin Wang | Zendy; Shi Xue Dou | Zendy; Mingzhong Wu | Zendy

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Single electron effects and Bloch oscillations in high-TC superconductive tunneling junctions

Author(s) -

G.A. Alvarez,

Xiaolin Wang,

Shi Xue Dou,

Mingzhong Wu

Publication year - 2007

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.2712828

Subject(s) - coulomb blockade , condensed matter physics , quantum tunnelling , supercurrent , josephson effect , cooper pair , physics , superconductivity , electron , semiclassical physics , coulomb , voltage , quantum mechanics , transistor , quantum

We investigated the effects of single electron charging energy in high-TC superconductors. Various phenomena originated from Coulomb blockade were observable in c-axis NdBa2Cu3O7−δ∕PrBa2Cu3O7−δ∕NdBa2Cu3O7−δ superconducting tunnel junctions. The current-voltage characteristics show a Coulomb gap for Cooper pair tunneling when the charging energy exceeds the Josephson coupling energy. A crossover from Coulomb blockade of Cooper pair tunneling to a supercurrent is observed when the ratio of Josephson coupling energy to charging energy is increased. We found a regime in which aspects of the Coulomb blockade of tunneling coexist with features typical of Josephson tunneling. Under microwave irradiation of frequency f, the dynamic resistance dV∕dI as a function of the current I showed sharp singularities at I=2nef, n=±1,±2,…. This behavior appears to be very similar to the one predicted by the semiclassical theory of Bloch oscillations.

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