212 citations · 2.6k across the 80 of their papers we have counts for
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Spatial resolution and point spread function of high-resolution scanning SQUID microscopy probes
Jan Ullmann, Katharina Kress, Timur Weber +5
Superconducting quantum interference devices (SQUIDs) show exceptional sensitivity to magnetic flux. In scanning SQUID microscopy (SSM), SQUID size and its distance to the sample a…
Tailoring the properties of YBaCuO thin films by 30 keV He irradiation: An enabling route to superconducting device nanopatterning
Bernd Aichner, Simon Koch, Philipp A. Korner +8
Focused helium ion beam (He-FIB) irradiation with 30 keV ions is a key tool for nanoscale patterning and defect engineering in high transition temperature (Tc) cuprate superconduct…
Structural Changes and Transport Properties of Locally Modified by a He Focused Ion Beam
Ross Carter, Robin Hutt, Paul Zimmermann +9
Irradiation of a material with ions can cause various defects that can lead to structural phase transitions and the modification of the material's properties. Here we study the irr…
YBaCuO nano-constriction Josephson junctions and SQUIDs fabricated by focused helium-ion-beam irradiation
Christoph Schmid, Christopher Buckreus, David Haas +9
By focused He ion beam irradiation, epitaxially grown YBaCuO (YBCO) thin films can be driven from the superconducting to the insulating state with in…
Advanced SQUID-on-lever scanning probe for high-sensitivity magnetic microscopy with sub-100-nm spatial resolution
Timur Weber, Daniel Jetter, Jan Ullmann +13
Superconducting quantum interference devices (SQUIDs) are exceptionally sensitive magnetometers capable of detecting weak magnetic fields. Miniaturizing these devices and integrati…
YBaCuO Josephson diode operating as a high-efficiency ratchet
Christoph Schmid, Alireza Jozani, Reinhold Kleiner +2
Using a focused He beam for nanopatterning and writing of Josephson barriers we fabricated specially shaped Josephson junctions of in-line geometry in YBaCuO thin f…
Temporal Evolution of Defects and Related Electric Properties in He-Irradiated YBaCuO Thin Films
Sandra Keppert, Bernd Aichner, Philip Rohringer +8
Thin films of the superconductor YBaCuO (YBCO) were modified by low-energy light-ion irradiation employing collimated or focused He beams, and the long-term sta…
Vector-substrate-based Josephson junctions
Yu-Jung Wu, Martin Hack, Katja Wurster +5
We present a way to We present a way to fabricate bicrystal Josephson junctions of high-Tc cuprate superconductors that does not require bulk bicrystalline substrates. Based on vec…
Vortex matching at 6 T in YBaCuO thin films by imprinting a 20 nm-periodic pinning array with a focused helium ion beam
Max Karrer, Bernd Aichner, Katja Wurster +9
Controlled engineering of vortex pinning sites in copper-oxide superconductors is a critical issue in manufacturing devices based on magnetic flux quanta. To address this, we emplo…
On the coupling of magnetic moments to superconducting quantum interference devices
J. Linek, M. Wyszynski, B. Müller +4
We investigate the coupling factor that quantifies the magnetic flux per magnetic moment of a point-like magnetic dipole that couples to a superconducting quantum int…
Tunable superconducting two-chip lumped element resonator
Benedikt Ferdinand, Daniel Bothner, Reinhold Kleiner +1
We have fabricated and investigated a stacked two-chip device, consisting of a lumped element resonator on one chip, which is side-coupled to a coplanar waveguide transmission line…
NanoSQUID magnetometry of individual cobalt nanoparticles grown by focused electron beam induced deposition
M. J. Martínez-Pérez, B. Müller, D. Schwebius +4
We demonstrate the operation of low-noise nano superconducting quantum interference devices (SQUIDs) based on the high critical field and high critical temperature superconductor Y…
Effective model for a short Josephson junction with a phase discontinuity
E. Goldobin, S. Mironov, A. Buzdin +3
We consider a short Josephson junction with a phase discontinuity created, e.g., by a pair of tiny current injectors, at some point along the length of the junction. We d…
Thermal and electromagnetic properties of BiSrCaCuO intrinsic Josephson junction stacks studied via one-dimensional coupled sine-Gordon equations
F. Rudau, M. Tsujimoto, B. Gross +17
We used one-dimensional coupled sine-Gordon equations combined with heat diffusion equations to numerically investigate the thermal and electromagnetic properties of a $300\,μ\math…
Optimizing the spin sensitivity of grain boundary junction nanoSQUIDs -- towards detection of small spin systems with single-spin resolution
Roman Wölbing, Tobias Schwarz, Benedikt Müller +4
We present an optimization study of the spin sensitivity of nanoSQUIDs based on resistively shunted grain boundary Josephson junctions. In addition the dc SQUIDs contain a narrow c…
Radiation power and linewidth of a semifluxon-based Josephson oscillator
M. Paramonov, M. Yu. Fominsky, V. P. Koshelets +4
We demonstrate a high-frequency generator operating at ~200GHz based on flipping a semifluxon in a Josephson junction of moderate normalized length. The semifluxon spontaneously ap…
Dendritic flux avalanches in Niobium single crystal near critical temperature
M. Grünzweig, P. Mikheenko, C. Grünzweig +4
We report on the observation of dendritic flux avalanches in a large Niobium single crystal. In contrast to avalanches observed in thin films, they appear only in a very narrow tem…
Phase retrapping in a pointlike Josephson junction: the Butterfly effect
E. Goldobin, R. Kleiner, D. Koelle +1
We consider a Josephson junction, which has a bistable zero-voltage state with the stationary phases . In the non-zero voltage state the phase "moves" viscously along a…
Memory cell based on a Josephson junction
E. Goldobin, H. Sickinger, M. Weides +4
The Josephson junction has a doubly degenerate ground state with the Josephson phases . We demonstrate the use of such a Josephson junction as a memory cell (classica…
Inductively coupled superconducting half wavelength resonators as persistent current traps for ultracold atoms
Daniel Bothner, Martin Knufinke, Helge Hattermann +7
A crucial point in the experimental implementation of hybrid quantum systems consisting of superconducting circuits and atomic ensembles is bringing the two partners close enough t…
Fractional vortex in asymmetric 0- long Josephson junctions
E. Goldobin, R. Kleiner, D. Koelle
We consider an infinitely long 0- Josephson junction consisting of 0 and regions having different critical current densities and . The ground state of suc…
Ferromagnetic planar Josephson junction with transparent interfaces: a ϕ junction proposal
D. M. Heim, N. G. Pugach, M. Yu. Kupriyanov +3
We calculate the current phase relation of a planar Josephson junction with a ferromagnetic weak link located on top of a thin normal metal film. Following experimental observation…
Optimizing the spin sensitivity of grain boundary junction nanoSQUIDs -- towards detection of small spin systems with single-spin resolution
Roman Wölbing, Tobias Schwarz, Benedikt Müller +4
We present an optimization study of the spin sensitivity of nanoSQUIDs based on resistively shunted grain boundary Josephson junctions. In addition the dc SQUIDs contain a narrow c…
Josephson junction with magnetic-field tunable current-phase relation
A. Lipman, R. G. Mints, R. Kleiner +2
We consider a 0- Josephson junction consisting of asymmetric 0 and regions of different lengths and having different critical current densities and $j_…