Ground States and Excitation Gaps the Double Spin Chain Systems ACuX_3 and KCrCl_3

双自旋链系统 ACuX_3 和 KCrCl_3 的基态和激发能隙

基本信息

  • 批准号:
    08454103
  • 负责人:
  • 金额:
    $ 4.99万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1996
  • 资助国家:
    日本
  • 起止时间:
    1996 至 1997
  • 项目状态:
    已结题

项目摘要

Recently, magnetic properties of the low-dimensional quantum spin systems with spatial structures have been of great interest. In particular, the quantization of the magnetization in the one-dimensional system is a new important problem. In the present study, we have investigated new quantum effect in KCuCl_3, TlCuCl_3 and NH_4CuCl_3 with the double chain. The exchange interactions in the double chain are described as a Heisenberg spin ladder with the diagonal interaction or an alternating chain with the next-nearest-neighbor interaction. From the recent theories, it is expected that the ground of the present systems is a spin singlet with an excitation gap. We first prepared large single crystals, and measured the magnetic susceptibilities of these three compounds. We found that the ground states of KCuCl_3 and TlCuCl_3 are spin singlets with excitation gaps as expected. We estimated the magnitude of the excitation gap by means of the high-field magnetization measurements. In order to … More investigate the magnetic excitations, we carried out the high-frequency high-field ESR measurements in KCuCl_3 and TlCuCl_3, and observed the excitations from the singlet ground states. We also performed neutron inelastic scattering measurements, and determined the dispersion relations in KCuCl_3 and TlCuCl_3.NH_4CuCl_3 has the same crystal structure as those of KCuCl_3 and TlCuCl_3 at room temperature. However, its zero-field ground state is magnetic in contrast with those of KCuCl_3 and TlCuCl_3. The remarkable feature of the magnetization process in NH_4CuCl_3 is two plateaus at one-quarter and three-quarters of the saturation magnetization. The plateaus appear in every external field direction. Between the magnetization plateaus, there are slopes. Thus, the plateaus cannot be understood in terms of the metamagnetic transitions in the Ising-like spin systems. The origin of the plateaus should be attributed to the quantum effect. It is suggested that the plateaus are accompanied with the excitation gap. We carried out the ESR measurements, and found that there are excitation gaps in the plateau regions. To the best of the authors' knowledge, NH_4CuCl_3 shows the first example of the quantization of the magnetization in a spin-1/2 system. The discovery of the magnetization plateaus in NH_4CuCl_3 is the most important fruit in the present study. However, the microscopic mechanism of the quantum magnetization process in NH_4CuCl_3 has not not clarified. Thus, to clarify the mechanism is one of the most important future problem. Less
近年来,具有空间结构的低维量子自旋系统的磁性研究引起了人们极大的兴趣。特别是一维系统中磁化强度的量子化是一个新的重要问题。本文研究了含双链的KCuCl_3、TlCuCl_3和NH_4CuCl_3体系的新量子效应。双链中的交换相互作用被描述为具有对角相互作用的海森堡自旋梯或具有次近邻相互作用的交替链。从最近的理论,它预计目前的系统的基础是一个自旋单态与激发间隙。我们首先制备了大单晶,并测量了这三种化合物的磁化率。我们发现KCuCl_3和TlCuCl_3的基态都是自旋单态,并有激发能隙。通过高场磁化测量,我们估计了激发间隙的大小。为了 ...更多信息 为了研究磁激发,我们对KCuCl_3和TlCuCl_3进行了高频高场ESR测量,观察到了单重基态的磁激发。NH_4CuCl_3与KCuCl_3和TlCuCl_3在室温下具有相同的晶体结构。与KCuCl_3和TlCuCl_3相比,它的零场基态是磁性的。NH_4CuCl_3的磁化过程的显著特征是在四分之一和四分之三饱和磁化强度处出现两个平台。高原出现在每个外部场方向。在磁化平台之间,存在斜坡。因此,在类伊辛自旋系统中的变磁跃迁不能理解平台。高原的起源应归因于量子效应。这表明,平台是伴随着激发间隙。我们进行了ESR测量,发现在平台区存在激发能隙。据作者所知,NH_4CuCl_3是自旋为1/2的系统中磁化量子化的第一个例子。NH_4CuCl_3磁化平台的发现是本研究中最重要的成果。然而,NH_4CuCl_3量子磁化过程的微观机制尚未阐明。因此,阐明其作用机理是今后研究的重要课题之一。少

项目成果

期刊论文数量(64)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T.Ono: "Phase Transitions and Critical Phenomena of Triangular Antiferromagnetic System : CsMn (Br_xI_<1-x>)_3" J. Magn. & Magn. Mater. 177-181. 735-736 (1998)
T.Ono:“三角反铁磁系统的相变和临界现象:CsMn (Br_xI_<1-x>)_3” J. Magn。
  • DOI:
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    0
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H.Tanaka: "High-Frequency High-Field ESR of Quantum Double Spin Chain Systems KCuCl_3 and TlCuCl_3" Physica B. (印刷中). (1998)
H. Tanaka:“量子双自旋链系统 KCuCl_3 和 TlCuCl_3 的高频高场 ESR”Physica B.(出版中)。
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    0
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  • 通讯作者:
H.Takeuchi: "EPR Study of Gd^<3+> Complexes Formed in Layred and Cubic Perovskite Crystals" Proc.1st Asia-Pacific EPR/ESR Symp.(in press).
H.Takeuchi:“层状和立方钙钛矿晶体中形成的 Gd^<3> 配合物的 EPR 研究”Proc.1st Asia-Pacific EPR/ESR Symp.(印刷中)。
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    0
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T.Kato: "Magnetic Excitation in the Spin Gap System KCuCl_3" J.Phys.Soc.Jpn.No.3 (in press). (1998)
T.Kato:“自旋间隙系统 KCuCl_3 中的磁激发”J.Phys.Soc.Jpn.No.3(印刷中)。
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  • 影响因子:
    0
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T.Mitsui: "Phase Transitions of KNiCl_3-Type Triangular Lattice Antiferromagnets" Proc. 9th Int. Meeting on Ferroelectrics. (印刷中). (1998)
T.Mitsui:“KNiCl_3 型三角晶格反铁磁体的相变”,第 9 届铁电学国际会议(1998 年)。
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    0
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TANAKA Hidekazu其他文献

Development of Methods of Creating and Observing Atomically-ordered Side-surfaces on Three-dimensionally Architected Si Substrates
在三维硅基片上创建和观察原子有序侧面的方法的发展
  • DOI:
    10.1380/vss.62.427
  • 发表时间:
    2019
  • 期刊:
  • 影响因子:
    0
  • 作者:
    HATTORI Azusa N.;TAKEMOTO Shohei;YANG Haoyu;HATTORI Ken;DAIMON Hiroshi;TANAKA Hidekazu
  • 通讯作者:
    TANAKA Hidekazu

TANAKA Hidekazu的其他文献

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{{ truncateString('TANAKA Hidekazu', 18)}}的其他基金

Elucidation of corrosion mechanism of galvanized steels in chloride environment using artificial rust and development of high corrosion resistant steels
利用人工锈蚀阐明氯化物环境中镀锌钢的腐蚀机理及高耐腐蚀钢的开发
  • 批准号:
    20K05156
  • 财政年份:
    2020
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
High-precision measurement of electron-neutrino with a water Cherenkov detector
利用水切伦科夫探测器高精度测量电子中微子
  • 批准号:
    26800128
  • 财政年份:
    2014
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Metabolomics in heart failure
心力衰竭的代谢组学
  • 批准号:
    25860602
  • 财政年份:
    2013
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Study in enhancement mechanism of corrosion resistance of steel using artificial rust particles and development of high corrosion resistant steels
人工锈颗粒增强钢耐蚀性机理研究及高耐蚀钢的开发
  • 批准号:
    23760699
  • 财政年份:
    2011
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Theoretical study on an unified process of planetesimal formation and accumulation
星子形成与积累统一过程的理论研究
  • 批准号:
    22540242
  • 财政年份:
    2010
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Elucidation of Enhancement Mechanism of Resistance to Corrosion of Galvanized Steel by Artificial Zinc Rusts
人工锌锈增强镀锌钢耐蚀性机理的阐明
  • 批准号:
    21760588
  • 财政年份:
    2009
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Novel Nano-electronics based on Strongly Correlated Oxides
基于强相关氧化物的新型纳米电子学
  • 批准号:
    21676001
  • 财政年份:
    2009
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Young Scientists (S)
On the effect of the symmetryviolation of loss function to the admissibility of estimation
损失函数对称性破坏对估计可接受性的影响
  • 批准号:
    21700309
  • 财政年份:
    2009
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Study of New Ground and Excited States in Quantum Spin Systems under Extreme Conditions
极端条件下量子自旋系统新基态和激发态的研究
  • 批准号:
    20244056
  • 财政年份:
    2008
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Nicotine-induced remodeling of synapse in hippocampal neuron.
尼古丁诱导海马神经元突触重塑。
  • 批准号:
    19590247
  • 财政年份:
    2007
  • 资助金额:
    $ 4.99万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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