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Syntheses and NMR study on low dimensional system with small spin-gap

Research Project

Project/Area Number 12640360
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 InstitutionSophia University

Principal Investigator

GOTO Takayuki  Sophia Uni., Faculty of Science and Technology, Assoc. Prof., 理工学部, 助教授 (90215492)

Co-Investigator(Kenkyū-buntansha) NAKAJIMA Satoru  Akita National College of Technology, Assoc. Prof., 自然科学系, 助教授 (90261544)
SUZUKI Takao  Sophia Uni., Faculty of Science and Technology, Research Associate, 理工学部, 助手 (40327862)
深瀬 哲郎  東北大学, 金属材料研究所, 教授 (90005900)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsSpin-gap / NMR / High-Tc cuprate / Quantum spin magnet / Magnetization plateau / 高温超伝導体 / 低次元量子スピン系磁性体 / スピンギャップ / 低次元量子スピン系
Research Abstract

The two-legged quantum spin ladder NH_4CuCl_3 has a gapless ground state at zero-field. With increasing field, the gap opens up in the two regions 5〜12.8 and 17.9〜24.7 T, resulting in the two-stepped plateaus in magnetization curve. Recent specific heat experiments propose the existence of the field-induced magnetic order to which the analogy with the Bose-Einstein condensation of magnons has been pointed out. In order to investigate the microscopic spin state of the plateaus and the magnetic order, Cu-NMR study under the field up to 30T has been performed.
In the low field region around the first plateau, all the NMR peaks are assigned to the singlet site with nearly zero internal field and with a large quadrupole interaction of 39.2MHz. This means that there are the two discrete spin states : the singlet site and excited triplet site with a large hyperfine field around -10T. The latter, which **counts for the finite macroscopic magnetization, is invisible by NMR due to the strong spin fluctuation of on site 3d-spins.
In the high field region between the 1st and 2nd plateaus, the Knight shift of the single site decreases with lowering temperature, and shows a kink at 4K, which corresponds the proposed phase boundary of the field-induced magnetic order (Phase II). Below the kink temperature, the shift stays at steady value rather than showing an upturn as observed in the magnon Bose-Einstein condensation in TlCuCl_3. No splitting or broadening in the singlet peaks arise at the kink temperature. Several satellite peaks, which show faster transverse relaxation, are observed around the singlet peak in this high field region. The splitting separation of a few kOe, which is magnetic origin, is already finite at 7K, well above the kink temperature, slightly increases as lowering temperature. The Knight shift of these satellite peaks also shows a kink at 4K.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report

Research Products

(27 results)

All Other

All Publications (27 results)

  • [Publications] T.Suzuki, et al.: "Hall coefficient of La_<1.88-y>Y_ySr_<0.12>CuO_4 (y=0,0.04) at low temperatures under high magnetic fields"Physical Review. B66. 104528-104532 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Suzuki, et al.: "Anomalous broadening of the spin-flop transition in the reentrant spinglass phase of La_<2-x>Sr_rCuO_4 (x=0.018)"Physical Review. B66. 172410-172413 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Suzuki, et al.: "Elastic constant of the vortex lattice in La1.875Ba0.065Sr0.060CuO4"Physica C. (in press). 2

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Hosoya, et al.: "NMR study on the quantum spin ladder NH_4CuCl_3"Physica B. (in press). 2

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Kunii, et al.: "Tl, Cu-NMR study on high-T_C cuprate TlBa_2(Y_<1-x>Ca_x)Cu_2O_7"Physica B. (in press). 2

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Endo, et al.: "Anomalous Splitting of ^1H-NMR Spectra in λ-(BEDT-TSF)_2FeCl_4"Journal of Physical Society of Japan. 71. 732-734 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Goto, S.Nakajima, et al.: "Tl(Ba, Sr)_2(Y, Ca)Cu_2O_7 in wide-range of hole concentration from antiferromagnetic to overdoped region"Advances in Material Research "Materials Science in High Magnetic Fields". 239-260 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Goto, M. Mori, K. Chiba, T. Suzuki and T. Fukase: "High-field Cu/La-NMR sfudy on high-T_c cuprate La_<2-x>Ba_xCuO_4(x=0.125)"Physica. B284-288. 657-658 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Endo, T. Goto, H. Uozaki, T. Fukase, K. Ueda, T. Sugimoto and N. Toyota: "^1H-NMR of an organic π-d metal κ-(BEDT-TSF)_2FeCl_4"Physica. B281-282. 682-683 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Fukase, T. Shinoda, Y. Oshima, T. Suzuki, K. Chiba, T. Goto, K. Yamada: "Elastic anomalies induced by spin-flop in La_<1.88>Sr_<0.12>CuO_4"Physica. B284-288. 483-484 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Kunii, T. Suzuki, A. Kakishima, T. Goto, S. Nakajima and T. Fukase: "NMR study on high-T_c cuprate TlBa_2(Y_<1-x>Ca_x)Cu_2O_7 with the wide-range of hole concentration from antiferromagnetic to overdoped region"J. Phys. and Chem. Solids.. 63. 1085-1087 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Endo, T. Goto, T. Fukase, H. Uozaki, H. Tsuchiya, H. Matsui and N. Toyota: "Anomalous Splitting of ^1H-NMR Spectra in λ-(BEDT-TSF)_2FeCl_4"J. Phys. Soc. Jpn.. 71. 732-734 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Goto, S. Nakajima, Y. Syono and T. Fukase: "NMR study on high-T_c cuprate Tl(Ba,Sr)_2(Y,Ca)Cu_2O_7 in wide-range of hole concentration from antiferromagnetic to overdoped region""Materials Science in High Magnetic Fields", (Springer-Verlag). 239-260 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Hosoya, K. Inokuchi, T. Suzuki, T. Goto, H. Tanaka, S. Awaji, K. Watanabe, T. Sasaki, T. Fukase, T. Shimizu, A. Goto: "NMRstudy on the quantum spin ladder NH_4CuCl_3"Physica B. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Kunii, T. Suzuki, A. Kakishima, T. Goto, S. Nakajima and T. Fukase: "Tl,Cu-NMR study on high-T_c, cuprate TlBa_2(Y_<1-x>Ca_x)Cu_2O_7"Physica B. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Suzuki, T. Goto, H. Goka, M. Fujita, K. Yamada: "Elastic constant of the vortex lattice in La_<1.875>Ba_<0.065>Sr_<0.060>CuO_4"Physica B. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Suzuki, T. Goto, K. Chiba, T. Fukase, M. Fujita, K. Yamada.: "Anomalous broadening of the spin-flop transition in the reentrant spin-glass phase of La_<2-x>Sr_xCu0_4(x=0.018)"Phys. Rev.. B66. 172410(4pages) (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Suzuki and T. Goto, K. Chiba, M. Minami, Y. Oshima and T. Fukase, M. Fujita, K. Yamada.: "Hall coefficient of La_<1.88-y>Y_ySr_<0.12>CuO_4(y=0, 0.04) at low temperatures undel high magnetic fields"Phys. Rev.. B66. 104528(4 pages) (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Endo, T. Goto, et al.: "Anomalous Splitting of ^1H-NMR Spectra in λ-(BEDT-TSF)_2FeCl_4"J. Phys. Soc. Jpn.. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] S. Endo, T. Goto, et al.: "Metal-insulator transitions in magnetic conductor l-(BEDT-TSF)2FeCl4 studied by 1H and 77Se NMR"Synthetic Metals. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Furukawa, T. Goto, et al.: "NMR studies of magnetic superconductor RuSr_2RECu_2O_8(RE=Gd, Eu and Y)"J. Phys. Chem. Solids. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Kunii, T. Goto, et al.: "NMR study on high-T_c cuprate TlBa_2(Y_<1-x>Ca_x)Cu_2O_7 with the wide-range of hole concentration from antiferromagnetic to overdoped region"J. Phys. Chem. Solids. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T. Fukase, T. Goto, et al.: "Elastic anomalies induced by spin-flop in La_<1.88>Sr_<0.12>CuO_4"Physica. B284-288. 483-484 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] S. Endo, T. Goto, et al.: "^1H-NMR of an organic π-d metal κ-(BEDT-TSF)_2FeCl_4"Physica. B281-282. 682-683 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] T. Goto, et al. (Eds. K. Watanabe, M.Motokawa): "Materials Science in High Magnetic Fields(Springer-Verlag)"NMR study on Tl-based high-T_C cuprate Tl(Ba, Sr)_2(Y, Ca)Cu_2O_7 in wide hole concentration range from antiferromagnetic to overdoped region. 325 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Fukase T.Shinoda Y.Ohsima T.Suzuki K.Chiba,T.goto,K.Yanda: "Elastic anomalies induced by spin-flop"Physical. B284. 483-484 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Erdo,T.goto,H.Uozaki T.Fnkase,K.Ueda T.Suginoto,N.Toyote: "H-NMR of organic π-d metals h-(BSDY-TTF)_2 Felly"Physical. B281. 682-683 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-03-31   Modified: 2020-05-15  

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