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最高性能超伝導材料の創製-高いTc,Jc,Hirrを持つCu-1234を基に-

研究報告コード R013000278
掲載日 2003年10月1日
研究者
  • 田中 康資
研究者所属機関
  • 独立行政法人 産業技術総合研究所
研究機関
  • 独立行政法人 産業技術総合研究所
報告名称 最高性能超伝導材料の創製-高いTc,Jc,Hirrを持つCu-1234を基に-
報告概要 最高性能超伝導材料は77Kにて最高のJc(臨界電流密度)とHirr(不可逆磁場)および最低のRs(表面抵抗)を持たなくてはならない。Cu-1234(CuBa2Ca3Cu4O12-y)は四つのCuO2超伝導層,一つの導電性CuO2+y電荷供給層,それにユニークな電子構造を持っている(図1)。最高性能の超伝導性はそのユニークな組成,格子構造および電子構造に由来している。Cu-1234は過剰ドーピング領域で高い臨界温度Tc(>117K)を持ち,低い超伝導異方性(γ=1.6),c軸に沿った長いコヒーレンス長(ξc=1nm)および小さな侵入距離(λc=220nm)を示した。それゆえ,高いJc{30MA/cm2(77K,0T),0.5MA/cm2(77K,10T)},高いHirr{30T(77K)},低いRs{30μΩ(77K,10GHz)}を持つ最高性能超伝導材料となる可能性がある。その予測はそれらの実測値と,ホール濃度,NMR,比熱,XPSの測定およびバンド計算で検証された。高いTc(>117K)が持続するCu-1234は選択過剰ドーピング効果によって得られた。もっと高いTc(Cu1-xTlx-1223の132KとCu1-xTlx-1234の126K)は一様最適ドーピング効果によって得られた。
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研究分野
  • 超伝導体の物性一般
  • 酸化物系超伝導体の物性
  • 超伝導材料
関連発表論文 (1) H. Ihara, “How to Achieve the Best Performance Superconductor based on Cu-1234”, Physica C, Vol. 364-365, November 2001, p. 289-297
(2) H. Kamimura, “Theory of high temperature superconductivity - from electronic structure to d-wave paring - “, Physica C, Vol. 364-365, November 2001, p. 87-94
(3) A. Crisan, S. Fujiwara, J.C.Nie, A. Sundaresan, H. Ihara, “RF-sputtered nano-dots: a costless method for inducing effective pinning centers in superconducting thin films”, Appl. Phys. Lett., 79, 4547(2001)
(4) Y. Tanaka, A. Iyo, H. Kato, K. Tokiwa, T. Watanabe, H. Ihara, “The role of multiple gaps on the Raman spectrum of (CuxC1-x)Ba2Can-1CunOy ”, Physica C, Vol. 378-381, Part1, 1 October 2002, p. 283-286
(5) A. Iyo, Y. Aizawa, Y. Tanaka, J. Arai, H. Ihara, “Oxygen isotope effect of high-pressure synthesized (Cu,C)Ba2Ca3Cu4Oy”, Physica C, Vol. 378-381, Part1, 1 October 2002, p. 298-302
(6) H. Kit?, A. Iyo, M. Hirai, A. Crisan, M. Tokumoto, S. Okayasu, M.Sasase, H. Ihara, “Superconducting properties of the Heavy-ions and Neutron Irradiated (Cu,C)Ba2Can-1CunO2n+4-δ(n=3,4 and 5)”, Physica C, Vol. 378-381, Part1, 1 October 2002, p. 329-332
(7) A. Sundaresan, J.C. Nie, M. Hirai, P. Baeica, S. Fujiwara, H. Asada, Y. Ishiura, H. Ihara, “Growth of TlxBa2Ca2Cu3Oy superconducting thin film on CeO2 buffered sapphire substrate,”, Physica C, Vol. 378-381, Part2, Octover 2002, p. 1283-1286
(8) J.C. Nie, A. Sundaresan, M. Hirai, Y. Ishiura, P. Badica, A. Crisan, H. Ihara, “Cum-1Bam(Sr,Ca)Cun+1O2m+2n+1 superconducting thin film by self assembly epitaxy method”, Physica C, Vol. 378-381, Part2, October 2002, p. 1278-1282
(9) A. Crisan, A. Iyo, H. Kito, Y. Tanaka, M. Hirai, M. Sasase, S. Okayasu, H. Ihara, “AC Susceptibility and Higher Harmonics Studies of Heavy-Ions Irradiated CuBa2Ca3Cu4Oy Bulk Superconductor with Highest Irreversibility Field above Liquid-nitrogen Temperature”, Physica C, Vol. 378-381, Part1, 1 October 2002, p. 112-117
(10) P. Badica, A. Crisan, H. Ihara, “The influence of Tl and O content from the starting mixture on phase formation in (Cu,Tl)-1234 system”, Physica C, Vol. 378-381, Part1, 1 October 2002, p. 683-687
(11) A. Crisan, S.K.Agarwal, T. Koganezawa, R. Kuroda, K. Tokiwa, T. Watanabe, A. Iyo, Y. Tanaka, H. Ihara, “The effect of pinning centers in Zn-doped CuBa2Ca3Cu4O12-y high-temperature superconductors”, J. Phys. Chem. Solids, Vol. 63, Issues 6-8, June-Aug., 2002, p. 1073-1076
(12) A. Iyo, Y. Tanaka, M. Tokumoto, H. Ihara, “High-pressure synthesis and properties of Ba2Can-1CunO2n(O,F)2 (n=2-5) superconductors”, Physica C, Vol. 366, December, 2001, p. 43-50
(13) Y. Tanaka, “Soliton in Two-Band Superconductor”, Physical Review Letters, Vol. 88, No. 1, 1 Jan., 2002, p. 017002-1
(14) A. Iyo, Y. Ishiura, Y. Tanaka, P. Badica, K. Tokiwa, T. Watanabe, H. Ihara, “Effects of residual carbon on phase formation of TlBa2Can-1CunOy (n=3 and 4) superconductors”, Physica C, Vol. 370, 1 March, 2002, p. 205-209
(15) H. Kotegawa, Y. Tokunaga, K. Ishida, G.-q. Zheng, Y. Kitaoka, A. Iyo, Y. Tanaka, H. Ihara, “Superconducting and magnetic characteristics in the multilayered high-Tc cuprates TlBa2Ca2Cu3O10-y with Tc>130 K probed by Cu and Tl NMR: High value for Tc”, Physical Review B, Vol. 65, 15 April, 2002, p. 184504
(16) A. Crisan, P. Badica, S. Fujiwara, J.C. Nie, A. Sundaresan, Y. Tanaka, H. Ihara, “Strong reduction of thermally activated flux jumps rate in superconducting thin films by nanodot-induced pinning centers”, Applied Physics Letters, Vol. 80, No. 19, p. 13 May, 2002, p. 3566-3568
(17) A. Sundaresan, A Crisan, J C Nie, M Hirai,H Asada, H Kito, Y Tanaka, H Ihara, “TlSr2CaCu2Oy template for the growth of superconducting Tl(Ba, Sr)2Ca2Cu3Oy thin films on CeO2 buffered sapphire, Superconductor Science and Technology, Vol. 15, No. 6, p. June, 2002, p. 960-963
(18) P. Badica, A. Iyo, A. Crisan, Y. Ishiura, A. Sundaresan, H. Ihara, “(Cu,Tl)Ba2Ca3Cu4Ox compositions:I. The influence of synthesis time and temperature on the phase formation and evaporation-condensation mechanism”, Superconductor Science and Technology, Vol. 15, No. 6, June, 2002, p. 964-974
(19) P. Badica, A. Iyo, A. Crisan, H. Ihara, “(Cu,Tl)Ba2Ca3Cu4Ox compositions:II. Heating rate applied to synthesis of superconducting ceramics”, Superconductor Science and Technology, Vol. 15, No. 6, June, 2002, p. 975-982
(20) A. Crisan, P. Badica, M. Hirai, H. Kito, A. Iyo, Y. Tanaka “Third harmonic susceptibility for studying the dissipation in heavyion irradiated (Cu, C)Ba2Ca3Cu4O12-y high temperature superconductor”, Superconductor Science and Technology, Vol. 15, 11 July 2002, p. 1240-1243
研究制度
  • 戦略的創造研究推進事業 CRESTタイプ、電子・光子等の機能制御/研究代表代行者 田中 康資(独立行政法人産業技術総合研究所エレクトロニクス研究部門)/科学技術振興事業団
研究報告資料
  • 伊原 英雄. Creation of the Best Performance Superconductor —based on Cu-1234 with High Tc, Jc and Hirr—. The Second CREST Symposium on ''Function Evolution of Materials and Devices based on Electron/Photon Related Phenomena'',2001. p.30 - 33.

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