Measuring station "strain" in a high-field helium cryostat

高场氦低温恒温器中的测量站“应变”

• 批准号: 468546864
• 金额: --
• 依托单位: Ruhr-Universität Bochum
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468546864?language=en
• 关键词: Measuring; station; strain; field; helium

We apply for a measurement station „strain“ that consists of a high-field Helium-cryostat, measurementcell and electronics. The station will enable measurements on diverse materials in a broad andcryogenic temperature environment (1.8K-ca.400K) and in high magnetic fields up to 17T – an environmentthat is decisive to access the unique properties of quantum materials. Strain is a thermodynamicquantity that encodes a variety of interesting and unique properties of a material. By determiningthese quantities in an advanced sample environment, we will achieve decisive contributionsto different projects in the area of quantum materials.The effect of large uniaxial strain on the Co-based antiferromagnets (Sr1-xCax)Co2As2 will be studied.This material exhibits complex magnetism and it is expected that the external strain will case switchingbetween different types of magnetic order. The external symmetry breaking may even inducenew phases that are otherwise not stable. In addition, strain may give access to critical behavior andthus act as a unique “tuning parameter”. Accurate determination of thermal strain (i.e., thermal expansivity)and magnetostriction will complete the project.Furthermore, we will study the strain behavior (thermal expansivity, magnetostriction, elastic moduli,influence of external uniaxial strain) of Fe(Se,S) in proximity to its nematic quantum critical point.Fe(Se,S) has by now the role of a model system for the still-enigmatic nematic phase. Although nematicorder is intrinsically linked to anisotropic strain, little is known about the strain behavior ofFe(Se,S) at low temperature and in high magnetic fields. Our measurements will thus make an importantcontribution to clarify the behavior of superconductivity arising around a nematic quantumcritical point.In addition, we will study the strain behavior of the family of van-der-Waals ferromagnets FeNGeTe2(N=3,4,5) and of the nematic insulator KFe0.8Ag1.2X2, (X=S,Se,Te)].

我们申请了一个测量站“应变”，该测量站由高场氦晶体，测量周和电子设备组成。该站将在广阔而低温的温度环境（1.8k-CA.400K）和高达17T的高磁场中对潜水员材料进行测量，该环境是决定性的，可访问量子材料的独特性能。应变是一种热力学量，它编码材料的各种有趣且独特的特性。通过在先进的样本环境中确定这些数量，我们将对量子材料领域的不同项目产生决定性贡献。将研究大型单轴菌株对基于CO的抗fiferromagnets（SR1-XCAX）CO2AS2的影响。将研究这种材料具有复杂的磁性，并且可以预期外部应变将在不同类型的磁性范围之间进行不同类型的磁性序列。外部对称性破裂甚至可能影响否则不稳定的阶段。此外，应变可能会访问临界行为，从而充当独特的“调整参数”。准确确定热应变（即热膨胀）和磁截图将完成该项目。FURTHERMORE，我们将研究应变行为（热膨胀，磁置，磁性模量，弹性模量，Fe（SE，S）的影响（SE，S）的影响（SE，s）在与Nematim dentum Crigitim Crigital Point的近端相关性。各向异性应变，在低温和高磁场下Fe（SE，S）的应变行为知之甚少。因此，我们的测量将做出重要的贡献，以阐明围绕nematic量子关键点产生的超导性的行为。此外，我们将研究Van-der-Waals Ferromagnets Fengete2（n = 3,4,5）的应变行为，列明kfe0.8ag1.2x2 xx2，x = s，s，s，s，s，s，s，s，se，