66 citations · 222 across the 16 of their papers we have counts for
14 papers · 1 filter
Structural analysis and transport properties of [010]-tilt grain boundaries in Fe(Se,Te)
Kazumasa Iida, Yoshihiro Yamauchi, Takafumi Hatano +10
Understanding the nature of grain boundaries is a prerequisite for fabricating high-performance superconducting bulks and wires. For iron-based superconductors [e.g. Ba(Fe,Co)A…
Theory of Josephson current on a lattice model of grain boundary in -wave superconductors
Takashi Sakamori, Satoshi Kashiwaya, Rikizo Yano +3
Identifying the origins of suppression of the critical current at grain boundaries of high-critical-temperature superconductors, such as cuprates and iron-based superconductors, is…
Nanoscale Texture and Microstructure in NdFeAs(O,F)/IBAD-MgO Superconducting Thin Film with Superior Critical Current Properties
Zimeng Guo, Hongye Gao, Keisuke Kondo +5
This paper reports the nanoscale texture and microstructure of a high-performance NdFeAs(O,F) superconducting thin film grown by molecular beam epitaxy on a textured MgO/YO…
Approaching the ultimate superconducting properties of (Ba,K)Fe2As2 by naturally formed low-angle grain boundary networks
Kazumasa Iida, Dongyi Qin, Chiara Tarantini +8
The most effective way to enhance the dissipation-free supercurrent in presence of magnetic field for type II superconductors is the introduction of defects that acts as artificial…
High and low anisotropy of hydrogen doped NdFeAsO superconducting thin film
Kazumasa Iida, Jens Hänisch, Keisuke Kondo +6
The recent realisations of hydrogen doped FeAsO (=Nd and Sm) superconducting epitaxial thin films call for further investigation of their structural and electrical transpor…
Realization of epitaxial thin films of the superconductor K-doped BaFeAs
Dongyi Qin, Kazumasa Iida, Takafumi Hatano +6
The iron-based superconductor BaKFeAs is emerging as a key material for high magnetic field applications owing to the recent developments in super…
Anisotropy of the transport properties of NdFeAs(O,F) thin films grown on vicinal substrates
Kazumasa Iida, Takuya Matsumoto, Keisuke Kondo +2
NdFeAs(O,F) thin films having different fluorine contents were grown on 5 deg. or 10 deg. vicinal cut MgO and CaF2 single crystalline substrates by molecular beam epitaxy. Structur…
Grain boundary characteristics of oxypnictide NdFeAs(O,F) superconductors
Kazumasa Iida, Taito Omura, Takuya Matsumoto +2
We have systematically investigated the grain boundary (GB) angle dependence of transport properties for NdFeAs(O,F) fabricated on [001]-tilt symmetric MgO bicrystal substrates. In…
Vortex glass-liquid transition and activated flux motion in an epitaxial, super-conducting NdFeAs(O,F) thin film
J. Hänisch, K. Iida, T. Ohmura +6
An epitaxial NdFeAs(O,F) thin film of 90 nm thickness grown by molecular beam epitaxy on MgO single crystal with Tc = 44.2 K has been investigated regarding a possible vortex glass…
Novel method to study strain effect of thin films using a piezoelectric-based device and a flexible metallic substrate
Kazumasa Iida, Yuwa Sugimoto, Takafumi Hatano +5
For applying tensile or compressive uniaxial strain to functional thin films, we propose a novel approach in combining a piezoelectric-based device and a technical metallic substra…
Ambipolar suppression of superconductivity by ionic gating in optimally-doped BaFe2(As,P)2 ultrathin films
Erik Piatti, Takafumi Hatano, Dario Daghero +9
Superconductivity (SC) in the Ba-122 family of iron-based compounds can be controlled by aliovalent or isovalent substitutions, applied external pressure, and strain, the combined…
Fabrication of grain boundary junctions using NdFeAs(O,F) superconducting thin films
Taito Omura, Takuya Matsumoto, Takafumi Hatano +2
We report on the growth of NdFeAs(O,F) thin films on [001]-tilt MgO bicrystal substrates with misorientation angle theta_GB=6°, 12°, 24° and 45°, and their inter- and intra-grain t…
Selective mass enhancement close to the quantum critical point in BaFe(AsP)
V. Grinenko, K. Iida, F. Kurth +16
A quantum critical point (QCP) is currently being conjectured for the BaFe(AsP) system at the critical value 0.3. In the proximity of a QCP,…
Highly textured oxypnictide superconducting thin films on metal substrates
Kazumasa Iida, Fritz Kurth, Masashi Chihara +9
Highly textured NdFeAs(O,F) thin films have been grown on ion beam assisted deposition (IBAD)-MgO/Y2O3/Hastelloy substrates by molecular beam epitaxy. The oxypnictide coated conduc…