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新しい低次元量子スピン系無機化合物の創生とその単結晶の作成

Research Project

Project/Area Number 08640467
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionAoyama Gakuin University

Principal Investigator

秋光 純  青山学院大学, 理工学部, 教授 (80013522)

Project Period (FY) 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1996: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywords一次元磁性体 / 量子スピン系 / 梯子格子 / 超伝導 / キャリア・ド-ピング
Research Abstract

我々は、2本足梯子格子(two-leg ladder)を持つSr_<14>Cu_<24>O_<41>においてSrサイトにCaを置換することにより圧力下で超伝導が出現することを初めて明らかにした。(T_c=12K)これは、いわゆるCuO_2面を持たない系での初めての超伝導の出現である。
更に、この系においてCa濃度の異なる種々の単結晶を作成し梯子格子系超伝導の物性を高温超伝導と対比させて研究した。特に、高温超伝導におけるいわゆる「異常金属相」が梯子格子系でも実現しているかどうかを輸送現象を中心に論じた。例えば梯子方向の電気抵抗率の温度変化が圧力を増加するにつれてT-linearからT^2-で変化することをみいだした。これは高温超伝導体におけるキャリア密度を変化させた時のunder-dope状態からover-dope状態への変化と対応している。しかし、この系においては梯子方向とその垂直方向ではT>T_cより上で異方性が10〜20倍も存在し準一次元性は保たれている。
スピンギャップについてはCa置換とともに小さくなってゆくが、超伝導状態でもスピンギャップが存在するかどうかは技術的な制約もあり今後の課題である。

Report

(1 results)
  • 1996 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] T.Sakaguchi,K.Kakurai,T.Yokoo,J.Akimitsu: "Neutron Scattering Study of Magnetic Excitation in the Spin S=1 One-Dimensional Heisenberg Antiferromagnet Y_2BaNiO_5" J.Phys.Soc.Jpn.65. 3025-3031 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Uehara,T.Nagata,J.Akimitsu,H.Takahashi,N.Mori,K.Kinoshita: "Superconductivity in the S=1/2 Spin Ladder System Sr_<0.4>Ca_<13.6>Cu_<24>O_<41.84>" J.Phys.Soc.Jpn.65. 2764-2767 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 銭谷勇磁、佐保田周治、秋光純、久保田伸彦、綾部統夫: "頂点臭素を含む長伝導体;(Ca,A)_2CuO_2Br_2:A=Na,K" 粉末粉体. 43. 1087-1089 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 秋光純、上原政智: "梯子格子で超伝導" パリティ. 12. 37-40 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 西正和、秋光純: "スピン・パイエルス系CuGeO3の研究-中性子散乱研究を中心として-" 固体物理. 31. 899-907 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Sato,J.Akimitsu,H.Takahashi,N.Mori: "Effect of High Pressure on Tc of a homologous series of oxycarbonate superconductors Sr_2(Ca,Sr)_<n-1>Cu_n(C0_3)_<1-x>(BO_3)_xO_y(n=1,2)and Ba_2Ca_2Cu_3(CO_3)_<1-x>BO_3)_xO_y" Physica C. 271. 79-82 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Arai,M.Fujita,M.Motokawa,J.Akimitsu,S.M.Bennington: "Quantum Spin Excitations in the Spin-Peierls CuGeO_3" Phys.Rev.Lett.77. 3649-3652 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.Kadono,H.Okajima,A.Yamashita,K.Ishii,T.Yokoo,J.Akimitsu,N.Kobayashi,Z.Hiroi,M.Takano,K.Nagamine: "Long-Range Magnetic Ordering in the Spin-Ladder Compound LaCuO_<2.5> Probed by Muon-Spin Relaxation" Phys.Rev.B. 54. R9628-R9630 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Ogita,Y.Tsunezumi,H.Aoki,M.Udagawa,O.Fujita,A.Ogiwara,J.Akimitsu: "Raman Scattering of CuGeO_3" Physica B. 219-220. 107-109 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Tsunezuma,N.Ogita,J.Akimitsu,E.Nakamura,M.Udagawa: "Absence of the Dielectric Anormaly at Tsp of CuGeO_3" J.Phys.Soc.Jpn.65. 3403-3404 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Steiner,K.Kakurai,B.Dorner,R.Pynn,J.Akimitsu: "The Change of Symmetry of the Soft-Mode Spin-Flop Transition as Observed in MnTiO_3 using Inelastic Polarized Neutron Scattering" J.Phys : Condens. Matter. 8. 5905-5914 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Mizokawa,A.Fujimori,T.Arima,Y.Tokura,N.Mori,J.Akimitsu: "Photoemission and X-Ray Absorption Spectroscopy of PrNiO_3" J.Electron Spectroscopy and Related Phenomena. 78. 191-194 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Ekino,H.Fujii,M.Kosugi,Y.Zenitani,J.Akimitsu: "Tunneling Spectroscopy of Superconducting Energy Gap in RNi_2B_2C(R=Y and Lu)" Phys.Rev.B. 53. 5640-5649 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] J.Akimitsu,M.Uehara,T.Nagata,S.Matsumoto,Y.Kinoshita,H.Takahashi,N.Mori: "Metal-Insurator Transition in the S=1/2 Spin-Ladder System(Sr_<0.4>Ca_<0.6>)_<14>Cu_<24-x>CoxO_<41-δ>" Physica C. 263. 475-481 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Nakata,H.Okajima,T.Yokoo,A.Yamashita,J.Akimitsu: "The Phase Diagram of the New Superconductor Sr_2CuO_2(CO_3)_<1-x>(BO_3)_x" Physica C. 263. 344-348 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] I.Tamada,M.Nishi,J.Akimitsu: "Electron Paramagnetic Resonance Governed by the Dzyaloshinsky-Moriya Antisymmetric Exchange Interaction in CuGeO_3" J.Phys : Condens. Matter. 8. 2625-2640 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 上原政智、秋光純: "梯子格子構造を有する銅酸化物へのキャリアド-ピング" 応用物理学会誌. 65. 394-400 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.C.Martin,G.Shirane,Y.Fujii,M.Nishi,O.Fujita,J.Akimitsu,M.Hase,K.Uchinokura: "Temperature Dependence of the Spin-Peierls Energy Gap and Anomalous Line Shapes in CuGeO_3" phys.Rev.B. 53. R14713-R14716 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2020-05-15  

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