Novel Ordered States in Matters as Microkelvin Temperatures

微开尔文温度下物质的新有序状态

基本信息

批准号：
10044075
负责人：
MAMIYA Takayoshi
金额：
$ 3.2万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044075/
关键词：
Microkelvin Ordered State Ground state Electronic Magnetism Nuclear Magnetism Liquid and Solid ィイD13ィエD1He Ultralow Temperature Quantum Liquid and Solid 固体ヘリウム3 空格子波核磁気秩序重い電子系ハルデンギャップ

项目摘要

The objective of this joint project was to observe and elucidate the ground states and related new phenomena which occur near the lowest temperature of the present technology, primarily in the microkelvin region. The scientific output of the project was significant both in quantity and quality, with important contributions to many sub-disciplines of condensed matter physics. These include solid and liquid ィイD13ィエD1He, solid hydrogen, nuclear and electronic magnetic ordering, interactions of spins in low dimensions, and transport properties of electrons. Many of the research results represent breakthroughs in the sub-disciplines.The nuclear ordering temperature in solid ィイD13ィエD1He was studied in the entire molar-volume range of the bcc phase. Evidence for quantum tunneling of the dislocations in bcc solid ィイD13ィエD1He was observed using the torsion oscillator technique. The change in nuclear magnetism from an antiferromagnetic to a ferromagnetic behavior in submonolayer is similar to th … More at of the second layer and can be explained in terms of a multiple spin exchange model. The pressure-independent contribution to the specific heat per surface area in liquid and solid ィイD13ィエD1He can be attributed to an amorphous surface solid. The magnetic susceptibility of ィイD13ィエD1He nano-clusters embedded in matrix of ィイD14ィエD1He was also studied. No indication of magnetic order was found in the investigated temperature range. NMR studies in solid hydrogen were used to determine the phase diagram of molecular hydrogen physisorbed on hexagonal boron nitride involving different types of orientational order in 2D. Spontaneous magnetization was observed at the ferromagnetic Weiss temperature = 2.6mK in PrPtィイD25ィエD2. In a heavy fermion compound CeCuィイD26ィエD2, the magnetic susceptibility and thermal expansion coefficient were measured and an indication of magnetic ordering was found at 2mK. Magnetic studies of even-chain spin effects in the Haldane-gap material NINAZ confirmed that the end-chain spins are S=1/2. The Fractional Quantum Hall State of an even denominator was observed at the n = 5/2 Landau level filling factor. Less

该联合项目的目的是观察和阐明在现有技术的最低温度附近（主要是在微开尔文区域）发生的基态和相关新现象。该项目的科学成果在数量和质量上都很重要。对凝聚态物理学的许多子学科做出了重要贡献，其中包括固体和液体、固体氢、核和电子磁序、低维自旋相互作用以及电子的传输特性。研究成果代表了子学科的突破。在bcc相的整个摩尔体积范围内研究了固体D13He中的核有序温度。使用扭转振荡器技术观察了bcc固体D13D1He中位错的量子隧道效应的证据。亚单层中核磁性从反铁磁行为到铁磁行为的变化类似于。第二层的磁化率可以用多重自旋交换模型来解释，液体和固体中单位表面积的比热的独立贡献可归因于非晶表面固体的磁化率。还研究了嵌入 D14D1He 基质中的 D13D1He 纳米团簇，在研究的 NMR 范围内没有发现磁序的迹象。固体氢研究用于确定六方氮化硼上物理吸附的分子氢的相图，涉及不同类型的二维取向顺序，在 PrPtD25D2（即重费米子化合物 CeCuIID26D2）中观察到了铁磁 Weiss 温度 = 2.6mK 的自发磁化。测量磁化率和热膨胀系数并指示磁化率在 Haldane 带隙材料 NINAZ 中发现了偶数链自旋效应的磁性研究，证实在 n = 时观察到偶数分母的分数量子霍尔态。 5/2 朗道水平填充系数小于。