Pulse-tube refrigerator physical property measurement system with 9 Tesla magnet

物理性质的研究，如热容量或电输运作为温度和磁场的函数，对于表征和详细研究新材料是必不可少的。我们的小组专注于由部分占据的d壳层或f壳层产生的强电子关联效应。我们对物质的新量子态及其低能激发感兴趣，如重费米子系统中量子临界引起的非费米液体行为、非传统超导、磁阻和量子自旋液体行为。为此，我们利用各种技术来合成单晶和多晶、薄膜和异质结构。我们申请了一个脉冲管制冷机物理性能测量系统(PPMS)，它带有9特斯拉磁铁，在1.8到400K的温度下可以测量热容量和电传输。该系统还将与3-He制冷器和我们的14 T液氦PPMS的其他几个选项(用于热传输、磁化和电容膨胀测量)兼容，该系统已经超额预定。计划中的研究项目包括：·研究Kitaev材料中的奇异基态和激发·研究新的几何受阻稀土氧化物中的量子自旋液体行为和场诱导相·金属Kagome-Layer稀土化合物中的磁性受挫和新相·新型层状铁和重费米子金属的设计和表征

The study of physical properties such as e.g. heat capacity or electrical transport as function of temperature and magnetic field is essential for the characterization and detailed investigation of novel materials. Our group focusses on strong electronic correlation effects, arising from partially occupied d- or f-shells. We are interested in novel quantum states of matter and their low-energy excitations, such as non-Fermi liquid behavior arising from quantum criticality in heavy-fermion systems, unconventional superconductivity, magnetic frustration and quantum spin liquid behavior. To this end, we synthesize single and polycrystals, thin films and heterostructures utilizing various techniques. The applied instrumentation is dedicated to investigate these samples.We apply for a pulse-tube refrigerator physical property measurement system (PPMS) with 9 Tesla magnet and measurement options for heat capacity and electrical transport at temperatures between 1.8 and 400 K. The system will also be compatible with the 3-Helium cooler and several other options (for thermal transport, magnetization and capacitive dilatometry) of our 14 T liquid helium PPMS which is highly overbooked. The requested Major Research Instrumentation will bypass this bottleneck and provide us an important independency from the supply with liquid helium.The planned research projects utilizing the requested PPMS include:• Study of exotic ground states and excitations in Kitaev materials• Investigation of quantum spin liquid behavior and field-induced phases in new geometrically frustrated rare-earth oxides• Magnetic frustration and novel phases in metallic Kagome-layer rare-earth compounds• Design and characterization of novel layered iron-pnictide and heavy-fermion metals