Low-temperature-compatible tunneling-current-assisted scanning microwave microscope utilizing a rigid coaxial resonator

Abstract

We present a design for a tunneling-current-assisted scanning near-field microwave microscope. For stable operation at cryogenic temperatures, making a small and rigid microwave probe is important. Our coaxial resonator probe has a length of approxomately 30 mm and can fit inside the 2-inch bore of a superconducting magnet. The probe design includes an insulating joint, which separates DC and microwave signals without degrading the quality factor. By applying the SMM to the imaging of an electrically inhomogeneous superconductor, we obtain the spatial distribution of the microwave response with a spatial resolution of approximately 200 nm. Furthermore, we present an analysis of our SMM probe based on a simple lumped-element circuit model along with the near-field microwave measurements of silicon wafers having different conductivities.

References in corpus (17)

• Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
• An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Microwave imaging of mesoscopic percolating network in a manganite thin film
• Quantitative Imaging of Sheet Resistance with a Scanning Near-Field Microwave Microscope
• AFM-compatible near-field scanning microwave microscope with separated excitation and sensing probes
• Surface Resistance Imaging with a Scanning Near-Field Microwave Microscope
• Evidence of local structural inhomogeneity in FeSe(1-x)Te(x) from extended x-ray absorption fine structure
• Effect of tip-geometry on contrast and spatial-resolution of the Near-Field Microwave Microscope
• Nanometer-Scale Materials Contrast Imaging with a Near-Field Microwave Microscope
• Atomic resolution imaging at 2.5 GHz using near-field microwave microscopy
• Microstructural analysis of phase separation in iron chalcogenide superconductors
• Anomalous Temperature Dependence of the Superfluid Density Caused by Dirty-to-Clean Crossover in FeSe${}_{0.4}$Te${}_{0.6}$ Single Crystals
• Microwave Surface Impedance Measurements of the Electronic State and Dissipation of Magnetic Vortices in Superconducting Iron-Based LiFeAs Single Crystals
• Investigation of the Superconducting Gap Structure in SrFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$ by Magnetic Penetration Depth and Flux Flow Resistivity Analysis
• Local Measurement of Microwave Response with Local Tunneling Spectra Using Near Field Microwave Microscopy
• Near-field microwave imaging of inhomogeneous K${}_x$Fe${}_y$Se${}_2$: separation of topographic and electric features