Tuning frustration in spin liquids by uniaxial pressure

通过单轴压力调节自旋液体中的挫败感

• 批准号: 263806350
• 负责人: Professor Dr. Philipp Gegenwart
• 金额: --
• 依托单位: Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/263806350?language=en
• 关键词: Tuning; frustration; spin; liquids; uniaxial

We explore novel quantum states of matter, in particular quantum spin liquids that arise due to strong geometrical frustration. Geometrical frustration is determined by the location of the atoms in the lattice and can hardly be varied in a controllable way without introducing disorder. Our entirely new experimental concept is to systematically vary geometrical frustration using uniaxial pressure and to detect with highest precision the linear thermal expansion down to very low temperature. This quantity is not only most sensitive to (magnetic) phase transitions but also to low-energy excitations, e.g. related to quantum criticality. Furthermore, as directional dependent probe of the entropy, it is ideally suited to investigate anisotropic properties of geometrically frustrated materials. Implementing the project requires the development of a uniaxial pressure dilatometer at the Max-Planck Institute CPFS in Dresden, as well as its application to single crystals of prototype materials, characterized at Augsburg University. Our main goal is to use uniaxial pressure for modifying geometrical frustration, tuning systems into novel quantum spin liquid states, as well as exploring the sensitivity of quantum spin liquids to symmetry-breaking distortions.

我们探索物质的新量子态，特别是由于强烈的几何挫折而产生的量子自旋液体。几何阻挫是由晶格中原子的位置决定的，并且很难在不引入无序的情况下以可控的方式变化。我们全新的实验概念是使用单轴压力系统地改变几何挫折，并以最高精度检测到非常低的温度下的线性热膨胀。这个量不仅对（磁）相变最敏感，而且对低能激发也最敏感，例如与量子临界性有关。此外，作为熵的方向相关探测，它非常适合研究几何阻挫材料的各向异性性质。实施该项目需要在德累斯顿的Max-Planck研究所CPFS开发单轴压力计，以及将其应用于原型材料的单晶，其特征在于奥格斯堡大学。我们的主要目标是使用单轴压力来修改几何挫折，将系统调谐到新的量子自旋液体状态，以及探索量子自旋液体对破坏扭曲的敏感性。

项目成果

Uniaxial stress tuning of geometrical frustration in a Kondo lattice

• DOI: 10.1103/physrevb.96.241110
• 发表时间: 2017-12
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: R. Kuechler;C. Stingl;Y. Tokiwa;M. Kim;T. Takabatake;P. Gegenwart

Uniaxial-stress tuned large magnetic-shape-memory effect in Ni-Co-Mn-Sb Heusler alloys

• DOI: 10.1063/1.4976212
• 发表时间: 2017-02
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: C. Mejia;R. Küchler;A. Nayak;C. Felser;M. Nicklas