26 citations · 99 across the 8 of their papers we have counts for
8 papers
Doping Dependence of Upper Critical Field of High-Tc Cuprate Bi2+xSr2-xCaCu2O8+d Estimated from Irreversibility Field at Zero Temperature
Junichiro Kato, Shigeyuki Ishida, Tatsunori Okada +12
We investigated the temperature (T) dependence of the irreversibility field Hirr(T) in high-critical-temperature cuprate Bi2+xSr2-xCa1-yYyCu2O8+d (Bi-2212) single crystals over a w…
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…
Electronic States and Energy Dissipations of Vortex Core in Pure FeSe Single Crystals Investigated by Microwave Surface Impedance Measurements
Tatsunori Okada, Yoshinori Imai, Takahiro Urata +3
In order to clarify electronic states and energy dissipations due to a motion of a vortex core in pure FeSe, which is a candidate superconductor possessing a super-clean core, we m…
Competition of superconductivity with the structural transition in Mo3Sb7
G. Z. Ye, J. -G. Cheng, J. -Q. Yan +8
Prior to the superconducting transition at Tc = 2.3 K, Mo3Sb7 undergoes a symmetry-lowering, cubic-to-tetragonal structural transition at Ts = 53 K. We have monitored the pressure…
Effects of post-annealing and cobalt co-doping on superconducting properties of (Ca,Pr)Fe2As2 single crystals
Tomoyuki Okada, Hiraku Ogino, Hiroyuki Yakita +3
In order to clarify the origin of anomalous superconductivity in (Ca,RE)Fe2As2 system, Pr doped and Pr,Co co-doped CaFe2As2 single crystals were grown by the FeAs flux method. Thes…
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…