Marc Scheffler
YOU?
Author Swipe
View article: High-quality superconducting tantalum resonators with beta phase defects
High-quality superconducting tantalum resonators with beta phase defects Open
For practical superconducting quantum processors, orders of magnitude improvement in coherence is required, motivating efforts to optimize hardware design and explore new materials. Among the latter, the coherence of superconducting transm…
View article: THz electrodynamics and superconducting energy scales of ZrN thin films
THz electrodynamics and superconducting energy scales of ZrN thin films Open
The terahertz (THz) properties of ZrN thin films grown with CMOS-techniques on industry-standard 300 mm silicon wafers are investigated in order to explore their superconducting behavior. The films have thicknesses ranging from 18 to 48 nm…
View article: Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope Open
Magnetic dynamics at the nanoscale provide crucial insight into the behavior of superconductors. Using single-spin scanning quantum microscopy, we probe vortex dynamics in the two-dimensional superconductor NbSe_{2}. Our measurements revea…
View article: Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope Open
The visualization of the magnetic responses of a two-dimensional (2D) superconducting material on the nanoscale is a powerful approach to unravel the underlying supercurrent behavior and to investigate critical phenomena in reduced dimensi…
View article: Interplay of coupling, residual, and quasiparticle losses for the frequency- and temperature-dependent quality factor of superconducting resonators
Interplay of coupling, residual, and quasiparticle losses for the frequency- and temperature-dependent quality factor of superconducting resonators Open
The overall, loaded quality factor quantifies the loss of energy stored in a resonator. Here we discuss on general grounds how of a planar microwave resonator made of a conventional superconductor should depend on temperature a…
View article: High quality superconducting tantalum resonators with beta phase defects
High quality superconducting tantalum resonators with beta phase defects Open
For practical superconducting quantum processors, orders of magnitude improvement in coherence is required, motivating efforts to optimize hardware design and explore new materials. Among the latter, the coherence of superconducting transm…
View article: Influence of growth parameters on the superconducting transition temperature in granular aluminum films
Influence of growth parameters on the superconducting transition temperature in granular aluminum films Open
This study investigates the influence of various growth parameters on normal-state resistivity and superconducting transition temperature Tc of granular aluminum films. Specifically, we focus on the effects of oxygen flow and aluminum evap…
View article: Tuning the superconducting dome in granular aluminum thin films
Tuning the superconducting dome in granular aluminum thin films Open
The peculiar superconducting properties of granular aluminum, which consists of nanometer-sized aluminum grains separated by aluminum oxide, are attractive for applications in quantum circuitry, and they are interesting from a fundamental …
View article: Interplay of coupling, residual, and quasiparticle losses for the frequency- and temperature-dependent quality factor of superconducting resonators
Interplay of coupling, residual, and quasiparticle losses for the frequency- and temperature-dependent quality factor of superconducting resonators Open
The overall, loaded quality factor $Q_\mathrm{L}$ quantifies the loss of energy stored in a resonator. Here we discuss on general grounds how $Q_\mathrm{L}$ of a planar microwave resonator made of a conventional superconductor should depen…
View article: Gapped magnetic ground state in the spin-liquid candidate $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$ suggested by magnetic spectroscopy
Gapped magnetic ground state in the spin-liquid candidate $κ$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$ suggested by magnetic spectroscopy Open
The nature of the magnetic ground state of highly frustrated systems remained puzzling to this day. Here, we have performed multifrequency electron spin resonance (ESR) measurements on a putative quantum spin liquid compound $κ$-(BEDT-TTF)…
View article: Tuning the superconducting dome in granular aluminum thin films
Tuning the superconducting dome in granular aluminum thin films Open
Granular aluminum, which consists of nanometer-sized aluminum grains separated by aluminum oxide, is a peculiar superconductor. Its phase diagram as function of normal-state resistivity features a superconducting dome with a maximum critic…
View article: Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators
Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators Open
Planar superconducting microwave transmission line resonators can be operated at multiple harmonic resonance frequencies. This allows covering wide spectral regimes with high sensitivity, as it is desired, e.g., for cryogenic microwave spe…
View article: Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators
Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators Open
Planar superconducting microwave transmission line resonators can be operated at multiple harmonic resonance frequencies. This allows covering wide spectral regimes with high sensitivity, as it is desired e.g. for cryogenic microwave spect…
View article: Nuclear and Electron Spin Resonance Studies on Skyrmion‐Hosting Lacunar Spinels
Nuclear and Electron Spin Resonance Studies on Skyrmion‐Hosting Lacunar Spinels Open
Magnetic resonance techniques at nuclei and electrons are applied to characterize the electronic structure and collective magnetic excitations throughout the magnetic phase diagrams of the lacunar spinels GaV 4 S 8 and GaV 4 Se 8 showing c…
View article: Gapped magnetic ground state in quantum-spin-liquid candidate κ-(BEDT-TTF)_2Cu_2(CN)_3
Gapped magnetic ground state in quantum-spin-liquid candidate κ-(BEDT-TTF)_2Cu_2(CN)_3 Open
Geometrical frustration, quantum entanglement and disorder may prevent long-range ordering of localized spins with strong exchange interactions, resulting in an exotic state of matter. κ-(BEDT-TTF)2Cu2(CN)3 is considered the prime candidat…
View article: Gapped magnetic ground state in quantum-spin-liquid candidate κ-(BEDT-TTF)_2Cu_2(CN)_3
Gapped magnetic ground state in quantum-spin-liquid candidate κ-(BEDT-TTF)_2Cu_2(CN)_3 Open
Geometrical frustration, quantum entanglement and disorder may prevent long-range ordering of localized spins with strong exchange interactions, resulting in an exotic state of matter. κ-(BEDT-TTF)2Cu2(CN)3 is considered the prime candidat…
View article: Indium tin oxide films meet circular Rydberg atoms: Prospects for novel quantum simulation schemes
Indium tin oxide films meet circular Rydberg atoms: Prospects for novel quantum simulation schemes Open
Long-lived circular Rydberg atoms are picking up increasing interest for\nboosting coherence times in Rydberg-based quantum simulation. We elaborate a\nnovel approach to stabilize circular Rydberg states against spontaneous and\nblackbody-…
View article: Planar GHz Resonators on SrTiO3: Suppressed Losses at Temperatures below 1 K
Planar GHz Resonators on SrTiO3: Suppressed Losses at Temperatures below 1 K Open
The complex dielectric constant $\hatε = ε_1 + i ε_2$ of SrTiO$_3$ reaches high values $ε_1 \approx 2*10^{4}$ at cryogenic temperatures, while the dielectric losses ($ε_2$) are much stronger than for other crystalline dielectrics. SrTiO$_3…
View article: Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonators
Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonators Open
We present an experimental approach for cryogenic dielectric measurements on ultrathin insulating films. Based on a coplanar microwave waveguide design, we implement superconducting quarter-wave resonators with inductive coupling, which al…
View article: Role of non-linear effects and standing waves in microwave spectroscopy: Corbino measurements on superconductors and VO2
Role of non-linear effects and standing waves in microwave spectroscopy: Corbino measurements on superconductors and VO2 Open
Broadband microwave spectroscopy can probe material properties in wide spectral and temperature ranges. The quality of such measurements crucially depends on the calibration, which also removes from the obtained spectra signatures of stand…
View article: Superconducting stripline resonators at frequencies up to 50 GHz for microwave spectroscopy applications
Superconducting stripline resonators at frequencies up to 50 GHz for microwave spectroscopy applications Open
Planar superconducting microwave resonators are commonly operated for various cryogenic applications, typically at frequencies between 2 and 15 GHz. But for certain applications, e.g. microwave spectroscopy to study the dynamics of charges…
View article: Optical signatures of the superconducting Goldstone mode in granular aluminum: Experiments and theory
Optical signatures of the superconducting Goldstone mode in granular aluminum: Experiments and theory Open
Recent advances in the experimental growth and control of disordered thin films, heterostructures, and interfaces provide a fertile ground for the observation and characterisation of the collective superconducting excitations emerging belo…
View article: Superconducting Pb stripline resonators in parallel magnetic field and their application for microwave spectroscopy
Superconducting Pb stripline resonators in parallel magnetic field and their application for microwave spectroscopy Open
Planar superconducting microwave resonators are key elements in a variety of technical applications and also act as sensitive probes for microwave spectroscopy of various materials of interest. Here superconducting Pb is a suitable materia…
View article: Superconducting energy scales and anomalous dissipative conductivity in thin films of molybdenum nitride
Superconducting energy scales and anomalous dissipative conductivity in thin films of molybdenum nitride Open
We report investigations of molybdenum nitride (MoN) thin films with\ndifferent thickness and disorder and with superconducting transition\ntemperature 9.89 K $\\ge{T_c}\\ge$ 2.78 K. Using terahertz frequency-domain\nspectroscopy we explor…
View article: Microwave study of superconducting Sn films above and below percolation
Microwave study of superconducting Sn films above and below percolation Open
The electronic properties of superconducting Sn films ($T_c \approx$ 3.8 K) change significantly when reducing the film thickness down to a few nm, in particular close to the percolation threshold. The low-energy electrodynamics of such Sn…
View article: Enhanced Cooper pairing versus suppressed phase coherence shaping the superconducting dome in coupled aluminum nanograins
Enhanced Cooper pairing versus suppressed phase coherence shaping the superconducting dome in coupled aluminum nanograins Open
Deterministic enhancement of the superconducting (SC) critical temperature\n$T_c$ is a long-standing goal in material science. One strategy is engineering\na material at the nanometer scale such that quantum confinement strengthens the\nel…
View article: Microwave study of superconducting Sn films above and below percolation
Microwave study of superconducting Sn films above and below percolation Open
The electronic properties of superconducting Sn films ($T_c \approx$ 3.8 K) change significantly when reducing the film thickness down to a few nm, in particular close to the percolation threshold. The low-energy electrodynamics of such Sn…