Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 2: Focus: High-resolution Lithography and 3D Patterning (Part I) (joint session KFM/CPP/HL)

KFM 2.2: Talk

Monday, March 16, 2020, 10:00–10:20, TOE 317

Fabrication of NbC Josephson-junction arrays by focused-ion-beam-induced deposition — •Fabrizio Porrati, Felix Jungwirth, Sven Barth, and Michael Huth — Goethe-University, Institute of Physics, Frankfurt a. M.

In this work, a Ga focused-ion-beam is used in combination with the precursor Nb(NMe2)3(N-t-Bu) to fabricate 2D Josephson-junction arrays made of NbC nanodots with typical diameter of 40 nm. Square-arrays with lattice constant between 70 nm and 100 nm are characterized by transport measurements. The ratio Ej/Ec between Josephson coupling energy and the charging energy can be varied by tuning either the dot thickness or the inter-dot distance. As a consequence, a superconductor to insulator transition takes place, as shown by temperature-dependent resistivity measurements. In the Josephson regime, the arrays show magnetic frustration. The resistance as function of the magnetic field exhibits an oscillating behavior with a period of 380 mT for the square-array with lattice constant of 70 nm.