2010 Fiscal Year Final Research Report
Development of High Performances and Novel Functions in Low-Growth Temperature (Cu, C) Superconducting Film by Controlling Multi-layer Structure
| Project/Area Number |
20560305
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Kagoshima University |
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Principal Investigator |
TERADA Norio Kagoshima University, 理工学研究科(工学系), 教授 (20322323)
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| Co-Investigator(Kenkyū-buntansha) |
OKUDA Testuji 鹿児島大学, 大学院・理工学研究科, 准教授 (20347082)
OBARA Kozo 鹿児島大学, 大学院・理工学研究科, 教授 (10094129)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 超伝導材料・素子 / 量子エレクトロニクス / 強相関エレクトロニクス / 表面・界面物性 |
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| Research Abstract |
Thin film process and enhancement of properties of (Cu, C)-system [(Cu,C)Ba_2Ca_<n-1>Cu_nO_x:(Cu,C)-12(n-1)n] high temperature superconductors have been studied. Contrary to the necessity of high temperature and high pressure for fabrication of bulk ceramics of this system, thin films of (Cu,C)-1201 phase have successfully synthesized by utilizing pulsed laser deposition on SrTiO_3 substrate under CO_2 mixed atmosphere. The (Cu,C)-1201 films show technological merits of the low growth temperature of 500～600 ℃ and superconducting critical temperature about 50 K which is sufficient to applications of high-speed digital circuits. Though surface roughness of the 1201 films directly on the substrate exceeded c-axis lattice parameter of this phase, it has been improved up to sub-nano meter level by the insertion of SrCuO_2 buffer with infinite layer structure between the 1201 film and the substrate. The (Cu,C)-1201/SrCuO_2 structures exhibit similar superconducting properties. These results mean that it is satisfied the necessary conditions for the investigation of the effect of multi-stacking of 1201 and related layers on superconducting properties of it. In the present study, remarkable enhancements of critical temperature are achieved in [CaCuO_2/(Cu,C)-1201]×N (N : repetition number of fundamental structure) multi-layered structure. T_<c-onset> and T_<c(ρ=0)> reach～100 K and >70 K, respectively. It is also noteworthy that the growth temperature of such high-T_c specimens still stays around 500℃. Structural analysis of the high-T_c specimens has revealed the strain at their hetero-interfaces is the main origin of the enhancement of superconductivity.
The achievements mentioned above shows that the novel superconducting film withtechnological merits : high T_c and low growth temperature, without toxic element has developed by adopting the hetero-interface effect to (Cu,C)-1201 layer, which also means the objective of this research is successfully achieved.
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[Journal Article] Synthesis of Smooth and Superconducting (Cu,C)-Ba-O_2/CaCuO_2/(Cu,C)-Ba-O Films using SrCuO_2 Buffer2010
Author(s)
T.Yamamoto, K.Tanaka, A.Yamanaka, T.Okuda, K.Tokiwa, A.Iyo, Y.Tanaka, A.Sundaresan, N.Terada
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Journal Title
Physica C vol.470
Pages: S71-S72
Peer Reviewed
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[Journal Article] Ferromagnetism and spin-glass transitions in the Heusler compounds Ru_<2-x>Fe_xCrSi2009
Author(s)
M.Hiroi, T.Rokkaku, K.Matsuda, T.Hisamatsu, I.Shigeta, M.Ito, T.Sakon, K.Koyama, K.Watanabe, S.Nakamura, T.Nojima, T.Nakano, L.Chen, T.Fujiwara, Y.Uwatoko, H.Manaka, N.Terada
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Journal Title
Phys.Rev.B vol.79
Pages: "224423-1-"224423-10"
Peer Reviewed
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[Journal Article] Synthesis of suoerconducting (Cu, C)-Ba-O films on SuCuO_2 buffer by pulsed laser deposition2009
Author(s)
T.Yamamoto, K.Kikunaga, M.Mitsunaga, T.Okuda, K.Obara, N.Kikuchi, Y.Tanaka, K.Tokiwa, T.Watanabe, N.Terada
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Journal Title
J.Phys.Conf.Series vol.150
Pages: "52286-1"-"52286-4"
Peer Reviewed
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[Journal Article] Progress in CIGS solar cell technologies2008
Author(s)
S.Niki, S.Ishizuka, K.Matsubara, K.Tampo, H.Komaki, Y.Kamikawa, K.Maejima, T.Yoshiyama, K.Mizukoshi, A.Yamada, H.Nakanishi, N.Terada
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Journal Title
IEEE Laser Electro-Opt.Soc.
Pages: 95-96
Peer Reviewed
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[Journal Article] Pulsed laser deposition synthesis of superconducting (Cu, C)-Ba-O thin film2008
Author(s)
T.Yamamoto, K.Kikunaga, K.Takeshita, K.Obara, T.Okuda, N.Kikuchi, Y.Tanaka, K.Tokiwa, T.Watanabe, N.Terada
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Journal Title
Peer Reviewed
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[Presentation] Characterization of Electronic Structure of Grain Boundaries in CIGS Absorber Layers by Kelvin Probe Force Microscopy2010
Author(s)
T.Fukae, H.Ichiki, H.Kashiwabara, T.Shiota, A.Yamanda, S.Ishizuka, K.Matsubara, S.Niki, Y.Yoshimura, N.Terada
Organizer
25th European Photovoltaic Sci.Engng.Conf.
Place of Presentation
Valencia, Spain
Year and Date
2010-09-07
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[Presentation] Ga Substitution Ratio Dependence of Electronic Structure at Interfaces between CBD-CdS and CIGS Grown by H_2O-Introduced co-Evaporation2008
Author(s)
N.Terada, H.Kashiwabara, S.Teshima, K Funai, T.Okuda, S.Ishizuka, K.Sakurai, A.Yamada, K.Matsubara, S.Niki
Organizer
2008 Spring Meeting of European Materials Research Society[invited].
Place of Presentation
Strasbourg, France
Year and Date
2008-05-30
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