NMR Study on AmO2 : Comparison with UO2 and NpO2
NMR Study on AmO2 : Comparison with UO2 and NpO2
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AmO2 的 NMR 研究：与 UO2 和 NpO2 的比较
DOI：
10.1143/jpsjs.80sa.sa110
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
他7名
中科院分区：
文献类型：
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作者：
Y.Tokunaga;S.Kambe;他7名
最近，首次对AmO2进行了17O核磁共振。我们观察到，在t0 =8.5 K以下，核磁共振光谱急剧变宽，同时核磁共振信号强度突然下降。这些数据提供了第一个微观证据，证明在这个温度下相变是该系统的整体特性。在本文中，我们将amo2的NMR结果与uo2和NpO2的结果进行了比较。在有序状态下，我们记录了一个三角形线形的17o核磁共振谱，既不像uo2也不像NpO2。该谱表明，内部局部场hinttis从0到最大值几乎是随机分布的，即Hintmax ~ 7koe。还比较了奈特位移和核弛豫速率的温度依赖性。
Recently,17O NMR has been performed for the first time on AmO2. We have observed a drastic broadening of the NMR spectrum, along with a sudden drop of NMR signal intensity, belowT0=8.5 K. These data provide the first microscopic evidence for a phase transition at this temperature as a bulk property of this system. In this paper, we compare NMR results for AmO2with those from UO2and NpO2. In the ordered state we have recorded an17O NMR spectrum with a triangular line shape, which resembles neither that of UO2nor NpO2. This spectrum indicates that the internal local fieldHintis distributed very nearly randomly from zero to a maximum value, that is,Hintmax∼7 kOe. The temperature dependences of the Knight shift and the nuclear relaxation rate are also compared.