40 citations · 190 across the 12 of their papers we have counts for
12 papers
Microwave Hall effect measurement for materials in the skin depth region
Ryo. Ogawa, Tatsunori Okada, Hideyuki Takahashi +2
We developed a new microwave Hall effect measurement method for materials in the skin depth region at low temperatures using a cross-shaped bimodal cavity. We analytically calculat…
Superconducting fluctuation in FeSe investigated by precise torque magnetometry
Hideyuki Takahashi, Fuyuki Nabeshima, Ryo Ogawa +3
We investigated the superconducting fluctuation in FeSe, which is assumed to be located in the BCS--BEC crossover region, via magnetic torque measurements. In our method, the absol…
Force-detected high-frequency electron spin resonance spectroscopy using magnet-mounted nanomembrane: robust detection of thermal magnetization modulation
Hideyuki Takahashi, Tsubasa Okamoto, Kento Ishimura +3
In this study, we report a conceptually novel broadband high-frequency electron spin resonance (HFESR) spectroscopic technique. In contrast to the ordinary force-detected ESR techn…
New method for torque magnetometry using a commercially available membrane-type surface-stress sensor
Hideyuki Takahashi, Kento Ishimura, Tsubasa Okamoto +2
We present a new method for torque magnetometry by using a commercially available membrane-type surface-stress sensor (MSS). This sensor has a silicon membrane supported by four be…
Wide-Dynamic-Range Cantilever Magnetometry Using a Fiber-Optic Interferometer and its Application to High-frequency Electron Spin Resonance Spectroscopy
Hideyuki Takahashi, Tsubasa Okamoto, Eiji Ohmichi +1
We present a method of broadening the dynamic range of optical interferometric detection of cantilever displacement. The key idea of this system is to use a wavelength-tunable lase…
Low-temperature-compatible tunneling-current-assisted scanning microwave microscope utilizing a rigid coaxial resonator
Hideyuki Takahashi, yoshinori imai, Atsutaka Maeda
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 pr…
Near-field microwave imaging of inhomogeneous KFeSe: separation of topographic and electric features
Hideyuki Takahashi, Yoshinori Imai, Atsutaka Maeda
It is important for modern scanning microwave microscopes to overcome the effect of the surface roughness. Here, we report microwave conductivity imaging of the phase-separated iro…
Exceptional Suppression of Flux-Flow Resistivity in FeSeTe by Back-Flow from Excess Fe Atoms and Se/Te Substitutions
Tatsunori Okada, Fuyuki Nabeshima, Hideyuki Takahashi +2
We measured the microwave surface impedance of FeSeTe single crystals with- and without external magnetic fields. The superfluid density exhibited a quadratic tempe…
Investigation of the Superconducting Gap Structure in SrFe(AsP) by Magnetic Penetration Depth and Flux Flow Resistivity Analysis
Hideyuki Takahashi, Tatsunori Okada, Yoshinori Imai +4
We measured the microwave surface impedances and obtained the superfluid density and flux flow resistivity in single crystals of a phosphor-doped iron-based superconductor SrFe…
Microwave Surface Impedance Measurements of the Electronic State and Dissipation of Magnetic Vortices in Superconducting Iron-Based LiFeAs Single Crystals
T. Okada, H. Takahashi, Y. Imai +4
LiFeAs is one of the iron-based superconductors having multiple gaps with the possible sign reversal. To clarify how those novel natures affect the energy dissipation of magnetic v…
Anomalous Temperature Dependence of the Superfluid Density Caused by Dirty-to-Clean Crossover in FeSeTe Single Crystals
Hideyuki Takahashi, Yoshinori Imai, Seiki Komiya +2
We report microwave surface impedances of FeSeTe single crystals measured at 12, 19, and 44 GHz. The penetration depth exhibits a power law behavior, $δλ_L=λ_L (T)-…
Microwave Surface Impedance Measurements of LiFeAs Single Crystals
Yoshinori Imai, Hideyuki Takahashi, Kentaro Kitagawa +6
We report results of microwave surface impedance measurements of LiFeAs single crystals. The in-plane penetration depth depends on temperature exponentially at low temperatures, wh…