TY - JOUR
T1 - Structural analysis and transport properties of [010]-tilt grain boundaries in Fe(Se,Te)
AU - Iida, Kazumasa
AU - Yamauchi, Yoshihiro
AU - Hatano, Takafumi
AU - Walter, Kai
AU - Holzapfel, Bernhard
AU - Hänisch, Jens
AU - Guo, Zimeng
AU - Gao, Hongye
AU - Shi, Haoshan
AU - Tokuta, Shinnosuke
AU - Hata, Satoshi
AU - Yamamoto, Akiyasu
AU - Ikuta, Hiroshi
N1 - © 2024 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.
PY - 2024
Y1 - 2024
N2 - 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)
2
As
2
, Fe(Se,Te), and NdFeAs(O,F)], the dependence of the critical current density
J
c
on misorientation angle (
θ
GB
) has been explored on [001]-tilt grain boundaries, but no data for other types of orientations have been reported. Here, we report on the structural and transport properties of Fe(Se,Te) grown on CeO
2
-buffered symmetric [010]-tilt roof-type SrTiO
3
bicrystal substrates by pulsed laser deposition. X-ray diffraction and transmission electron microscopy revealed that
θ
GB
of Fe(Se,Te) was smaller whereas
θ
GB
of CeO
2
was larger than that of the substrate. The difference in
θ
GB
between the CeO
2
buffer layer and the substrate is getting larger with increasing
θ
GB
. For
θ
GB
≥
24
∘
of the substrates,
θ
GB
of Fe(Se,Te) was zero, whereas
θ
GB
of CeO
2
was continuously increasing. The inclined growth of CeO
2
can be explained by the geometrical coherency model. The
c
-axis growth of Fe(Se,Te) for
θ
GB
≥
24
∘
of the substrates is due to the domain matching epitaxy on (221) planes of CeO
2
. Electrical transport measurements confirmed no reduction of inter-grain
J
c
for
θ
GB
≤
9
∘
, indicative of strong coupling between the grains.
AB - 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)
2
As
2
, Fe(Se,Te), and NdFeAs(O,F)], the dependence of the critical current density
J
c
on misorientation angle (
θ
GB
) has been explored on [001]-tilt grain boundaries, but no data for other types of orientations have been reported. Here, we report on the structural and transport properties of Fe(Se,Te) grown on CeO
2
-buffered symmetric [010]-tilt roof-type SrTiO
3
bicrystal substrates by pulsed laser deposition. X-ray diffraction and transmission electron microscopy revealed that
θ
GB
of Fe(Se,Te) was smaller whereas
θ
GB
of CeO
2
was larger than that of the substrate. The difference in
θ
GB
between the CeO
2
buffer layer and the substrate is getting larger with increasing
θ
GB
. For
θ
GB
≥
24
∘
of the substrates,
θ
GB
of Fe(Se,Te) was zero, whereas
θ
GB
of CeO
2
was continuously increasing. The inclined growth of CeO
2
can be explained by the geometrical coherency model. The
c
-axis growth of Fe(Se,Te) for
θ
GB
≥
24
∘
of the substrates is due to the domain matching epitaxy on (221) planes of CeO
2
. Electrical transport measurements confirmed no reduction of inter-grain
J
c
for
θ
GB
≤
9
∘
, indicative of strong coupling between the grains.
U2 - 10.1080/14686996.2024.2384829
DO - 10.1080/14686996.2024.2384829
M3 - Article
C2 - 39563900
SN - 1468-6996
VL - 25
SP - 2384829
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
IS - 1
ER -