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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

这个联合项目的目的是观察和阐明基态和相关的新现象，这些现象发生在当前技术的最低温度附近，主要是在微开尔文区域。该项目的科学产出在数量和质量上都很重要，对凝聚态物理的许多分支学科都有重要贡献。其中包括固体和液体he、固体氢、原子核和电子的磁序、低维自旋的相互作用以及电子的输运性质。许多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，研究了固体中核的有序温度。用扭转振荡器技术观察了bcc固体中位错量子隧穿的证据。亚单层核磁从反铁磁性到铁磁性的变化与第二层的变化相似，可以用多自旋交换模型来解释。液体和固体中每表面积比热的压力无关贡献可归因于非晶表面固体。还研究了嵌入在钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基钛基的磁化率。在所研究的温度范围内，没有发现磁性有序的迹象。利用固体氢的核磁共振研究，确定了六方氮化硼物理吸附的氢分子的二维相图，包括不同类型的取向顺序。在PrPt φ 25 φ D2中，在铁磁Weiss温度= 2.6mK时观察到自发磁化。测定了重费米子化合物CeCu γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。对Haldane-gap材料NINAZ中偶链自旋效应的磁研究证实了端链自旋为S=1/2。偶分母的分数量子霍尔态在n = 5/2朗道能级填充因子下被观察到。少