Magnetic and Superconductive properties of Uranium Intermetallic Compounds.

铀金属间化合物的磁性和超导性能。

基本信息

批准号：
62460028
负责人：
ADACHI Kengo
金额：
$ 4.42万
依托单位：
Nagoya 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：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

In order to make clear the electronic process magnetic and conduction properties of urenium compounds, an intermetallic compound UAu_3 is investigated. This sample from two crystal structures, Cu_3 Ti and Ag_3 Pu types, the former is obtained by a quenching from liquid state and the latter by an annealing of the former.Electrical resistivity vs. temperature shows a sharp and broad maximum for both phases respectivity, representing the dense Kondo effect. Low temperature specific heat shows an anomaly for both at 10K and 22K respectively, corresponding to the antiferromagnetic transition at T<@D2N@>D2. The coefficient of electronic specific heat estimated from T<T<@D2N@>D2 and T>T<@D2N@>D2, gamma<and gamma> respectively, is given to be gamma<= 100 and gamma>= 280 for Cu<@D23@>D2 Ti phase and gamma<= 105 and gamma>(]sy.simeg[) 800 mJ/K<@D12@>D1. mole for Ag<@D23@>D2Pu, indicating the heavy fermion behavior. The paramagnetic susceptibility above T<@D2N@>D2 for both shows the Curie-Weiss low with the effective moment, mu<@D2eff@>D2 = 3.3 and 3.0 mu<@D2B@>D2 respectively, characterizing a localization of 5f electrons. The magnetization curve up to the field of 60kOe for Cu<@D23@>D2 Ti type shows a metamagnetic behavior below 27K, while that for Ag<@D23@>D2 Pu type accompanies with weak ferromagnetism below T<@D2N@>D2 added to the antiferromagnetic magnetization.Thus, it is clarified that both UAu_3 phases show the dense Kondo and heavy fermion effects with an antiferromagnetic ordering at low temperature. Further experiment on the single crystal is desirable.

为了清除Urenium化合物的电子过程磁和传导性能，研究了金属间化合物UAU_3。该样品来自两个晶体结构，即Cu_3 Ti和Ag_3 PU类型，前者是通过液态淬火获得的，而后者通过退火来获得。电阻率与温度均显示出两个阶段的相应性的敏锐最大值，代表了密集的近kondo效应。低温比热热显示在10K和22K处的异常，对应于T <@d2n@> d2时的抗磁磁过渡。分别从T <T <@d2n@> D2和T> T <@d2n@> D2，Gamma <和Gamma>的T <@d2n@> d2和gamma>的T <@d2n@> d2@> t <@d2n@>> gamma <= 100和gamma> = 280的cu <@d23@@d23@> d2 ti相位和gamma <= 105和gamma <= 105 and stysy.g.sime，gamma> = 280 mj/k <@d12@> d1。 ag <@d23@> d2pu的mole鼠，表明繁重的费用行为。 T <@d2n@> d2上方的顺磁敏感性都以有效的力矩显示了curie-weiss Low，Mu <@d2eff@> d2 = 3.3和3.0 mu <@d2b@> d2分别表征了5F电子的本地化。磁化曲线曲线至60KOE的cu <@d23@> d2 ti类型在27k以下显示属于元磁的行为，而对于Ag <@d23@> d2@> d2 pu类型伴随着弱的铁磁性，低于t <@d2n@> d2 d2添加到抗Ferromagagnetic Magnetization中，并显示了d2 phieptif dyuified。在低温下具有抗磁磁有序的效果。需要对单晶进行进一步的实验。