Linking dynamics and kinetics of defect-doped spin chains and ladders

连接缺陷掺杂自旋链和梯子的动力学和动力学

• 批准号: 245897470
• 负责人: Professor Dr. Bernd Büchner
• 金额: --
• 依托单位: Laboratorium für Festkörperphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245897470?language=en
• 关键词: Linking; dynamics; kinetics; defect; doped

The goal of the present DACH Swiss-German proposal is to experimentally investigate the correlation between dynamical and transport properties of one dimensional quantum magnets, by combining neutron spectroscopy and thermal conductivity measurements. The main issue that we wish to address is excitations and transport in gapless spin chains and ladders with defects (spin impurities). We shall contrast defect physics in double-chain structures (where, classically, a propagating magnetic quasiparticle could bypass a defect), to that in single chains (where chain fragmentation makes defects unavoidable). We also plan to investigate the dependence of defect-induced phenomena on the sign and strength of quasiparticle (spinon) interactions. For these tasks we have selected several target compounds that are known to be almost ideal realizations of basic one dimensional S = 1/2 Heisenberg models. S = 0, S = 1, and S = 3/2 and other types of defects will be introduced by means of chemical substitution. Inelastic neutron scattering experiments will probe the effect of spin defects on the spinon excitation spectrum, with a focus on novel localized and bound defect states. Parallel heat transport measurements will investigate the kinetic aspects of spinon propagation and their interactions with lattice phonons. The ultimate goal will be to connect the findings of these dynamical and kinetic studies in a single physical picture. For most planned avenues of research, tantalizing and very promising preliminary results have already been obtained. The main idea of this DACH joint proposal is to take synergetic advantage of the complementary expertise that has been built up ETH Zurich and IFW Dresden. The group at ETHZ has a long standing record in neutron scattering studies of quantum magnets, but also substantial experience in organic spin systems. The team at IFW Dresden is a recognized leader in magnetic transport studies, and has extensive experience with low-dimensional cupric oxides. The two groups will also pool their arsenal of supplementary characterization methods, including NMR and high-resolution Raman spectroscopy (ETHZ).

目前DACH瑞士-德国提案的目标是通过结合中子能谱和热导率测量，实验研究一维量子磁体的动力学和输运性质之间的相关性。我们希望解决的主要问题是激发和输运的无隙自旋链和梯子的缺陷（自旋杂质）。我们将对比双链结构中的缺陷物理学（在经典情况下，传播的磁性准粒子可以绕过缺陷）和单链中的缺陷物理学（在单链中，链断裂使缺陷不可避免）。我们还计划调查的依赖缺陷引起的现象的准粒子（自旋）相互作用的符号和强度。对于这些任务，我们已经选择了几个目标化合物，已知是基本的一维S = 1/2海森堡模型的几乎理想的实现。S = 0、S = 1和S = 3/2以及其他类型的缺陷将通过化学取代引入。非弹性中子散射实验将探测自旋缺陷对自旋子激发谱的影响，重点是新的局域和束缚缺陷态。平行热输运测量将研究自旋传播的动力学方面及其与晶格声子的相互作用。最终的目标是将这些动力学和动力学研究的结果连接到一个单一的物理图像中。就大多数计划中的研究途径而言，已经取得了诱人和非常有希望的初步成果。该DACH联合提案的主要思想是利用ETH苏黎世和IFW德累斯顿已经建立的互补专业知识的协同优势。ETHZ的小组在量子磁体的中子散射研究方面有着长期的记录，但在有机自旋系统方面也有丰富的经验。IFW Dresden的团队是磁输运研究领域公认的领导者，在低维氧化铜方面拥有丰富的经验。这两个小组还将汇集他们的补充表征方法，包括NMR和高分辨率拉曼光谱（ETHZ）。

项目成果

Magnetic ordering in the ultra-pure site-diluted spin chain materials SrCu$_{1-x}$Ni$_x$O$_2$

超纯位点稀释自旋链材料 SrCu$_{1-x}$Ni$_x$O$_2$ 中的磁排序

• DOI: 10.1103/physrevb.93.214430
• 发表时间: 2016
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: G. Simutis;M. Thede;R. Saint-Martin;A. Mohan;C. Baines;Z. Guguchia;R. Khasanov;C. Hess;A. Revcolevschi;B. Büchner;A. Zheludev
• 通讯作者: A. Zheludev

Effect of different in-chain impurities on the magnetic properties of the spin chain compound SrCuO2 probed by NMR

NMR探测不同链内杂质对自旋链化合物SrCuO2磁性能的影响

• DOI: 10.1103/physrevb.96.115135
• 发表时间: 2017
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Y. Utz;F. Hammerath;R. Kraus;T. Ritschel;J. Geck;L. Hozoi;J. van den Brink;A. Mohan;C. Hess;K. Karmakar;S. Singh;D. Bounoua;R. Saint-Martin;L. Pinsard- Gaudart;A. Revcolevschi;B. Büchner;H. Grafe
• 通讯作者: H. Grafe

Spin pseudogap in the S = 1 2 chain material Sr 2 CuO 3 with impurities

S=1 2 链状材料中的自旋赝能隙Sr 2 CuO 3 含有杂质

• DOI: 10.1103/physrevb.95.054409
• 发表时间: 2017
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: G. Simutis;S. Gvasaliya;N. S. Beesetty;T. Yoshida;J. Robert;S. Petit;A. I. Kolesnikov;M. B. Stone;F. Bourdarot;H. C. Walker;D. T. Adroja;O. Sobolev;C. Hess;T. Masuda;A. Revcolevschi;B. Büchner;A. Zheludev
• 通讯作者: A. Zheludev

Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr 2 CuO 3

Ni掺杂Sr 2 CuO 3 中自旋赝能隙的开放抑制杂质引起的局域磁性

• DOI: 10.1103/physrevb.92.060405
• 发表时间: 2015
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Y. Utz;F. Hammerath;S. Nishimoto;C. Hess;N. S. Beesetty;R. Saint-Martin;A. Revcolevschi;B. Büchner;H. Grafe
• 通讯作者: H. Grafe

Pseudospin transport in the Jeff = 1/2 antiferromagnet Sr2IrO4

Jeff = 1/2 反铁磁体 Sr2IrO4 中的赝自旋输运

• DOI: 10.1209/0295-5075/114/57007
• 发表时间: 2016
• 期刊: Europhysics Letters
• 作者: F. Steckel;A. Matsumoto;T. Takayama;H. Takagi;B. Büchner;C. Hess
• 通讯作者: C. Hess