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Dive into the research topics where Takahiko Kawaguchi is active.

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Featured researches published by Takahiko Kawaguchi.


Applied Physics Express | 2010

Systematic Comparison of Eight Substrates in the Growth of FeSe0.5Te0.5 Superconducting Thin Films

Yoshinori Imai; Takanori Akiike; Masafumi Hanawa; Ichiro Tsukada; Ataru Ichinose; Atsutaka Maeda; Tatsuo Hikage; Takahiko Kawaguchi; Hiroshi Ikuta

We have investigated the crystal structures and superconducting properties of thin films of FeSe0.5Te0.5 grown on eight different substrates. Superconductivity is not correlated with the lattice mismatch; rather it is correlated with the degree of in-plane orientation and with the lattice parameter ratio c/a. The best superconducting properties were observed in films on MgO and LaAlO3 (Tczero of 9.4 K). Transmission electron microscopy observation showed that the presence or absence of an amorphous-like layer at the substrate surface plays a key role in determining the structural and superconducting properties of the grown films.


Applied Physics Express | 2011

Epitaxial Growth of FeSe0.5Te0.5 Thin Films on CaF2 Substrates with High Critical Current Density

Ichiro Tsukada; Masafumi Hanawa; Takanori Akiike; Fuyuki Nabeshima; Yoshinori Imai; Ataru Ichinose; Seiki Komiya; Tatsuo Hikage; Takahiko Kawaguchi; Hiroshi Ikuta; Atsutaka Maeda

In-situ epitaxial growth of FeSe


Applied Physics Letters | 2010

In situ growth of superconducting NdFeAs(O,F) thin films by molecular beam epitaxy

Takahiko Kawaguchi; Hiroki Uemura; Toshiya Ohno; Masao Tabuchi; Toru Ujihara; Koshi Takenaka; Yoshikazu Takeda; Hiroshi Ikuta

_{0.5}


Applied Physics Express | 2009

Epitaxial Growth of NdFeAsO Thin Films by Molecular Beam Epitaxy

Takahiko Kawaguchi; Hiroki Uemura; Toshiya Ohno; Ryotaro Watanabe; Masao Tabuchi; Toru Ujihara; Koshi Takenaka; Yoshikazu Takeda; Hiroshi Ikuta

Te


Superconductor Science and Technology | 2014

The strain effect on the superconducting properties of BaFe2(As, P)2 thin films grown by molecular beam epitaxy

Takahiko Kawaguchi; A. Sakagami; Y Mori; Masao Tabuchi; Toru Ujihara; Yoshikazu Takeda; Hiroshi Ikuta

_{0.5}


Japanese Journal of Applied Physics | 2011

Substrate Dependence of Structural and Transport Properties in FeSe0.5Te0.5 Thin Films

Masafumi Hanawa; Ataru Ichinose; Seiki Komiya; Ichiro Tsukada; Takanori Akiike; Yoshinori Imai; Tatsuo Hikage; Takahiko Kawaguchi; Hiroshi Ikuta; Atsutaka Maeda

thin films is demonstrated on a non-oxide substrate CaF


Applied Physics Express | 2011

Molecular Beam Epitaxy Growth of Superconducting NdFeAs(O,F) Thin Films Using a F-Getter and a Novel F-Doping Method

Takahiko Kawaguchi; Hiroki Uemura; Toshiya Ohno; Masao Tabuchi; Toru Ujihara; Yoshikazu Takeda; Hiroshi Ikuta

_2


Applied Physics Letters | 2015

Unusually high critical current of clean P-doped BaFe2As2 single crystalline thin film

F. Kurth; C. Tarantini; V. Grinenko; Jens Hänisch; J. Jaroszynski; E. Reich; Y. Mori; A. Sakagami; Takahiko Kawaguchi; J. Engelmann; L. Schultz; B. Holzapfel; Hiroshi Ikuta; Ruben Hühne; Kazumasa Iida

. Structural analysis reveals that compressive stress is moderately added to 36-nm thick FeSe


Journal of the Physical Society of Japan | 2012

Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2

Shunji Sugai; Yuki Mizuno; Ryoutarou Watanabe; Takahiko Kawaguchi; Koshi Takenaka; Hiroshi Ikuta; Yasumasa Takayanagi; Naoki Hayamizu; Yasuhiro Sone

_{0.5}


Journal of Physics: Conference Series | 2014

Bicrystalline Grain Boundary Junctions of Co-doped and P-doped Ba-122 Thin Films

Stefan Schmidt; Sebastian Döring; F. Schmidl; F. Kurth; Kazumasa Iida; B. Holzapfel; Takahiko Kawaguchi; Y. Mori; Hiroshi Ikuta; P. Seidel

Te

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Yoshikazu Takeda

Synchrotron Radiation Center

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