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1996•Journal of Experimental and Theoretical Physics LettersRequires access

Coulomb blockade electrometer with a high-T c island

Sergey Kubatkin, Alexander Tzalenchuk, Z. G. Ivanov, Per Delsing, R. I. Shekhter, T. Claeson

Open publisher page 5 citations

Abstract

We report on a successful attempt to fabricate a Coulomb blockade electrometer consisting of an ultrasmall YBa 2 Cu 3 O 7−δ (YBCO) island coupled to two gold electrodes through a high-resistance native surface tunnel barrier. A third electrode placed near the island was used as an electrostatic gate. Spectra typical for tunneling into the YBCO superconductor were reproducibly measured. At temperatures below 0.5 K the low-bias conductance was suppressed by the Coulomb blockade. The blockade could be periodically varied by the gate potential. An external magnetic field of up to 5 T strongly influenced the transport via the island but without any change in the period of the Coulomb oscillations.

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What this paper is about

We report on a successful attempt to fabricate a Coulomb blockade electrometer consisting of an ultrasmall YBa 2 Cu 3 O 7−δ (YBCO) island coupled to two gold electrodes through a high-resistance native surface tunnel barrier. A third electrode placed near the island was used as an electrostatic gate. Spectra typical for tunneling into the YBCO superconductor were reproducibly measured. At temperatures below 0.5 K the low-bias conductance was suppressed by the Coulomb blockade. The blockade could be periodically varied by the gate potential. An external magnetic field of up to 5 T strongly influenced the transport via the island but without any change in the period of the Coulomb oscillations.

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Available abstract

We report on a successful attempt to fabricate a Coulomb blockade electrometer consisting of an ultrasmall YBa 2 Cu 3 O 7−δ (YBCO) island coupled to two gold electrodes through a high-resistance native surface tunnel barrier. A third electrode placed near the island was used as an electrostatic gate. Spectra typical for tunneling into the YBCO superconductor were reproducibly measured. At temperatures below 0.5 K the low-bias conductance was suppressed by the Coulomb blockade. The blockade could be periodically varied by the gate potential. An external magnetic field of up to 5 T strongly influenced the transport via the island but without any change in the period of the Coulomb oscillations.

Key concepts: Electrometer, Coulomb blockade, Condensed matter physics, Quantum tunnelling, Conductance, Blockade, Electrode, Materials science

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