T. Tamegai
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View article: Evolution of critical current density in FeSe-based superconductors with two superconducting domes
Evolution of critical current density in FeSe-based superconductors with two superconducting domes Open
View article: Depairing critical current density and the vortex-free state in FeSe nanobridges
Depairing critical current density and the vortex-free state in FeSe nanobridges Open
The depairing limit and the vortex-free state in a superconductor is crucial for both the study of supercurrent related physics and the application eliminating noise linked to vortex motion. In this work, we report the evidence of depairin…
View article: Breakdown of the critical state in the ferromagnetic superconductor EuFe$_2$(As$_{1-x}$P$_x$)$_2$
Breakdown of the critical state in the ferromagnetic superconductor EuFe$_2$(As$_{1-x}$P$_x$)$_2$ Open
There are very few materials in which ferromagnetism coexists with superconductivity due to the destructive effect of the magnetic exchange field on singlet Cooper pairs. The iron-based superconductor EuFe$_2$(As$_{1-x}$P$_x$)$_2$ is there…
View article: Impact of disorder on the superconducting properties and BCS–BEC crossover in FeSe single crystals
Impact of disorder on the superconducting properties and BCS–BEC crossover in FeSe single crystals Open
We investigate the crystal structure, transport properties and specific heat in five selected FeSe single crystals containing different amounts of disorder. Transport measurements show that disorder significantly suppresses the superconduc…
View article: Magnetically controlled vortex dynamics in a ferromagnetic superconductor
Magnetically controlled vortex dynamics in a ferromagnetic superconductor Open
Ferromagnetic superconductors are exceptionally rare because the strong ferromagnetic exchange field usually destroys singlet superconductivity. EuFe 2 (As 1− x P x ) 2 , an iron-based superconductor with a maximum critical temperature of …
View article: Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling
Observation of uniform supercurrent flow in polycrystalline K-doped Ba122 by combined magneto-optical imaging and finite-element modeling Open
Macroscopic current uniformity in a (Ba,K)Fe 2 As 2 bulk sample produced by a process that demonstrated high trapped magnetic fields was evaluated through a comparative experimental and modeling approach. The bulk sample, with a well-defin…
View article: Effects of disorder on quantum transport properties in the topologically nontrivial metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PbTaSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Effects of disorder on quantum transport properties in the topologically nontrivial metal Open
Weak antilocalization (WAL), an increase in the electrical conductivity at\nlow temperatures associated with the suppression of electron localization due\nto quantum interference effects, is often observed in topological materials. In\nthi…
View article: Magnetically-controlled Vortex Dynamics in a Ferromagnetic Superconductor
Magnetically-controlled Vortex Dynamics in a Ferromagnetic Superconductor Open
Ferromagnetic superconductors are exceptionally rare because the strong ferromagnetic exchange field usually destroys singlet superconductivity. EuFe$_2$(As$_{1-x}$P$_x$)$_2$, an iron-based superconductor with a maximum critical temperatur…
View article: Evolution of critical current density in CaKFe<sub>4</sub>As<sub>4</sub> with La-doping
Evolution of critical current density in CaKFe<sub>4</sub>As<sub>4</sub> with La-doping Open
Single crystals of (Ca 1− x La x )KFe 4 As 4 (0 x 0.16) have been grown by using the self-flux method, and the evolution of physical properties including the critical current density ( J c with La-doping has been investigated. T c…
View article: Critical current density and AC magnetic susceptibility of high-quality FeTe0.5Se0.5 superconducting tapes
Critical current density and AC magnetic susceptibility of high-quality FeTe0.5Se0.5 superconducting tapes Open
View article: Multiple magnetic orders discovered in the superconducting state of EuFe<sub>2</sub>(As <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> P <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> )<sub>2</sub>
Multiple magnetic orders discovered in the superconducting state of EuFe<sub>2</sub>(As P )<sub>2</sub> Open
The interplay between superconductivity and magnetism is an important subject in condensed matter physics. EuFe 2 As 2 -based iron pnictides could offer an interesting plateau to study their relationship that has attracted considerable att…
View article: Suppression of the sausaging effect in (Ba,Na)Fe2As2 round wires by using Ag1−Sn /Cu double sheath
Suppression of the sausaging effect in (Ba,Na)Fe2As2 round wires by using Ag1−Sn /Cu double sheath Open
We report the fabrication of (Ba,Na)Fe2As2 round wires that are processed using the hot isostatic pressing (HIP) technique. We employed double sheaths composed of Cu and Ag1−zSnz alloy because they offer superior mechanical strength compar…
View article: Normal-state resistivity and the depairing current density of BaFe$_2$(As,P)$_2$ nanobridges along the $c$ axis
Normal-state resistivity and the depairing current density of BaFe$_2$(As,P)$_2$ nanobridges along the $c$ axis Open
We report precise measurements to obtain the normal-state resistivity and the depairing current density of BaFe$_2$(As$_{1-x}$P$_x$)$_2$($x\sim0.29-0.32$) nanobridges along the $c$ axis, which are fabricated from single crystals near the o…
View article: Superconductivity of Co-Doped CaKFe4As4 Investigated via Point-Contact Spectroscopy and London Penetration Depth Measurements
Superconductivity of Co-Doped CaKFe4As4 Investigated via Point-Contact Spectroscopy and London Penetration Depth Measurements Open
The iron-based superconductors (IBSs) of the recently discovered 1144 class, unlike many other IBSs, display superconductivity in their stoichiometric form and are intrinsically hole doped. The effects of chemical substitutions with electr…
View article: Crossover between Anomalous Peak Effects Induced by Splayed and Tilted Columnar Defects in Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub>
Crossover between Anomalous Peak Effects Induced by Splayed and Tilted Columnar Defects in Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub> Open
We investigated the magnetic field dependence of the critical current density\n(Jc) in Ba0.6K0.4Fe2As2 with various configurations of columnar defects (CDs)\nintroduced by 2.6 GeV U or 320 MeV Au irradiations. Splayed CDs are introduced\nb…
View article: Suppression of the Sausaging Effect in (Ba,Na)Fe2as2 Round Wires by Using Ag1−Zsn Z /Cu Double Sheath
Suppression of the Sausaging Effect in (Ba,Na)Fe2as2 Round Wires by Using Ag1−Zsn Z /Cu Double Sheath Open
View article: Ferromagnetic levitation and harmonic trapping of a milligram-scale yttrium iron garnet sphere
Ferromagnetic levitation and harmonic trapping of a milligram-scale yttrium iron garnet sphere Open
We report passive magnetic levitation and three-dimensional harmonic trapping of a 0.3-milligram, 0.5-millimeter-diameter yttrium iron garnet sphere at 4 K. The gradient of an external magnetic field is used for vertical trapping, while th…
View article: Iron-based superconductors have joined the practical high-field magnet family
Iron-based superconductors have joined the practical high-field magnet family Open
This is a viewpoint on the letter by Hangwei Ding et al . (2023 Supercond. Sci. Technol. 36 11LT01).
View article: Peak effects induced by particle irradiations in 2<i>H</i>-NbSe<sub>2</sub>
Peak effects induced by particle irradiations in 2<i>H</i>-NbSe<sub>2</sub> Open
Various peak effects in 2 H -NbSe 2 single crystals induced by particle irradiations were studied. 3 MeV proton irradiation magnified the peak effect induced by order–disorder (O-DO) transition of vortices, where the peak field shifts from…
View article: Intrinsic pinning of FeSe1−S single crystals probed by torque magnetometry
Intrinsic pinning of FeSe1−S single crystals probed by torque magnetometry Open
View article: Unusual Transport Properties with In-plane Magnetic Field in Sr<sub>x</sub>Bi<sub>2</sub>Se<sub>3</sub> Single Crystals
Unusual Transport Properties with In-plane Magnetic Field in Sr<sub>x</sub>Bi<sub>2</sub>Se<sub>3</sub> Single Crystals Open
A topological insulator Bi 2 Se 3 becomes a topological superconductor by doping Cu or Sr. Due to the nematicity of these A x Bi 2 Se 3 ( A = Cu, Sr) materials, physical quantities show two-fold rotational symmetry as a function of in-plan…
View article: Turbulent Structure and Characterization of ‘11’-type Iron-based Superconductors by Magneto-optical Imaging
Turbulent Structure and Characterization of ‘11’-type Iron-based Superconductors by Magneto-optical Imaging Open
Magneto-optical imaging is employed to investigate the vortex penetration modes in ‘11’-type iron-based superconductors (IBSs) Fe(Te 0.6 Se 0.4 ) and FeSe single crystals. In Fe(Te 0.6 Se 0.4 ), vortices penetrate mostly homogeneously from…
View article: Trapping Magnetic Field in Bulk Iron-based Superconductor Sintered under High Pressure
Trapping Magnetic Field in Bulk Iron-based Superconductor Sintered under High Pressure Open
We fabricated two bulk superconductors of (Ba,Na)Fe 2 As 2 using a cubic press and hot press sintering technique. For bulk #1 sintered by cubic press, despite its small dimensions, with diameter 4.1 mm and height 3.64 mm, a trapped field v…
View article: Two-dimensional Superconductivity in Misfit Layered Compound (BiSe)<sub>1.10</sub>NbSe<sub>2</sub>
Two-dimensional Superconductivity in Misfit Layered Compound (BiSe)<sub>1.10</sub>NbSe<sub>2</sub> Open
Novel two-dimensional superconductivity in a misfit layered compound (BiSe) 1.10 NbSe 2 with a critical temperature T c of 2.7 K is reported. The temperature dependence of H c2 is linear close to T c for both H ∥ c -axis and H ∥ ab -plane,…
View article: X-ray Characterizations of Iron-based Superconductor Round Wires with Large Critical Current Density
X-ray Characterizations of Iron-based Superconductor Round Wires with Large Critical Current Density Open
Characterizations of round wires of iron-based superconductors were performed by using two different X-ray techniques. The core of the round wire turns out to be concentrically textured. The texturing parameter ( r ) defined by r = I (002)…
View article: Peak Effect Induced by Heavy-ion Irradiation in 2H-NbSe<sub>2</sub> Single Crystals
Peak Effect Induced by Heavy-ion Irradiation in 2H-NbSe<sub>2</sub> Single Crystals Open
Peak effect has been studied in 2 H -NbSe 2 single crystals with splayed columnar defects introduced by 320 MeV Au irradiation. Through the magnetic relaxation experiments, correspondence between the peak effect and magnetic relaxation has…
View article: Anomalously small magnetic relaxation rate of Ca<sub>10</sub>(Pt<sub>3</sub>As<sub>8</sub>)(Fe<sub>2−<i>x</i> </sub>Pt<i> <sub>x</sub> </i>As<sub>2</sub>)<sub>5</sub> superconductor
Anomalously small magnetic relaxation rate of Ca<sub>10</sub>(Pt<sub>3</sub>As<sub>8</sub>)(Fe<sub>2−<i>x</i> </sub>Pt<i> <sub>x</sub> </i>As<sub>2</sub>)<sub>5</sub> superconductor Open
Large critical current density and low magnetic relaxation are the main challenges for practical applications of high-temperature superconductors (HTSs). Magnetic relaxation refers to the decay of superconducting current density caused by …
View article: Ferromagnetic levitation and harmonic trapping of a milligram-scale Yttrium Iron Garnet sphere
Ferromagnetic levitation and harmonic trapping of a milligram-scale Yttrium Iron Garnet sphere Open
We report passive magnetic levitation and three-dimensional harmonic trapping of a 0.3 milligram, 0.5 millimeter diameter Yttrium Iron Garnet sphere at 4 K. The gradient of an external magnetic field is used for vertical trapping, while th…
View article: Modulated Relaxation of Critical Current in (Ba<sub>1−</sub><i><sub>x</sub></i>Rb<i><sub>x</sub></i>)Fe<sub>2</sub>As<sub>2</sub>
Modulated Relaxation of Critical Current in (Ba<sub>1−</sub><i><sub>x</sub></i>Rb<i><sub>x</sub></i>)Fe<sub>2</sub>As<sub>2</sub> Open
View article: Particle Irradiation Induced <i>T</i><sub>c</sub> Suppression in NbSe<sub>2</sub> via Lattice Expansion
Particle Irradiation Induced <i>T</i><sub>c</sub> Suppression in NbSe<sub>2</sub> via Lattice Expansion Open