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Researches on Transport Property and Electronic Structure of Metallic Superlattices, Metal Oxides and Metal Halogenides

金属超晶格、金属氧化物和金属卤化物的输运性质和电子结构研究

基本信息

批准号：
01460036
负责人：
TANUMA Sei-ichi
金额：
$ 3.84万
依托单位：
Iwaki Meisei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

(1)As one of the main research equipments for joint use in the Department of Materials Science, a MBE(molecular beam epitaxy)film growing machine was installed in 1988. The Grant was partially used for activating this MBE work, i. e., a study of metallic superlattice. Europium and strontium were chosen as the superlattice elements, because that Eu has a spin moment and Sr which is very similar to Eu in atomic size and divalency has no spin, so that interesting magnetic behaviors dependent on superlattice periods are expected. By using BaF_2 (111)face as the substrate, Sr was grown epitaxially and Eu followed. The epitaxy was proved by RHEED and X-ray diffraction. Below about 1 OK, a ferromagnetic magnetization was observed as a preliminary measurement.(2) The most important metal oxides at present should be CUO_2-based high Tc superconductors. An effective simple controlling treatment for the oxygen concentration was found in Y_1Ba_2CU_3O_y, which included a heating in the normal-atmos … More phere and a successive quenching.Researches on the conduction property of yttrium- and bismuth- oxides superconductors in the microwave frequency range were done. Different from the DC measurement, the resistance measurement iri microwave frequency range is hardly influenced by grain boundaries. It was found that the measured surface resistance showed an anomaly which related to an uncommomly large effective surface area.(3)The bromine and ICI intercalated graphite compounds were taken up as the metal halogenides, Br_2 or ICl were intercalated into KIKAFILM of Nihon Carbon Co. (an equivalent material to grafoil of the Union Carbide Co.)in the room temperature by hanging above the surface of solution of halogen and CCl_4. During the reaction term, resistance, magnetoresistance and Hall effect were in-situ measured. By analysing the obtained data, the reaction-time dependence of the concentrations of conduction holes and electrons was deduced.GaCl_3 was intercalated by co-sealing with chlorine gas and a NIKAFILM chip into a glass ampule. The first and second stage compounds were obtained at the room temperature. Higher stage compound were made by puming the ampule which included a low stage compound and heating it at the temperature of several tens ﾟC. The stage dependence of the conductivity of GaCl_3-GICs is to be investigated in order to compare to the proposed theory of the head investigator. Less

（1）材料科学系主要联合研究设备之一，于1988年安装了MBE（分子束外延）薄膜生长机。该拨款部分用于启动这项MBE工作，即：例如，金属超晶格的研究。选择铕和锶作为超晶格元素，因为Eu具有自旋矩，而原子尺寸和二价性与Eu非常相似的Sr没有自旋，因此可以预期依赖于超晶格周期的有趣的磁行为。以BaF_2(111)面为衬底，外延生长Sr，随后外延生长Eu。通过RHEED和X射线衍射证明了外延生长。在约1 OK以下，初步测量到了铁磁磁化强度。(2)目前最重要的金属氧化物应该是CUO_2基高温超导体。在Y_1Ba_2CU_3O_y中发现了一种有效的、简单的氧浓度控制处理方法，包括常压加热和连续淬火。对钇氧化物和铋氧化物超导体在微波频率范围内的导电性能进行了研究。与直流测量不同，微波频率范围内的电阻测量几乎不受晶界影响。 (3)将溴和ICI插层石墨化合物作为金属卤化物,在室温下将Br_2或ICl插层到日本碳公司的KIKAFILM(相当于联合碳化物公司的grafoil)中,悬挂在卤素溶液的表面上。 CCl_4。在反应期间，原位测量了电阻、磁阻和霍尔效应。通过分析获得的数据,推导了传导空穴和电子浓度与反应时间的关系。通过与氯气和NIKAFILM芯片共密封将GaCl_3嵌入玻璃安瓿中。在室温下得到第一阶段和第二阶段化合物。高级化合物是通过对含有低级化合物的安瓿进行泵压并在几十℃的温度下加热来制备的。需要研究 GaCl_3-GIC 电导率的阶段依赖性，以便与首席研究员提出的理论进行比较。较少的