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Magnetism and electron spin resonance in single crystalline beta-AgNpO2(SeO3)

机译:β-AgNpO2(SeO3)单晶的磁性和电子自旋共振

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We report magnetization, susceptibility, electrical transport, and electron spin resonance (ESR) studies of single crystals of beta-AgNPO2(SeO3). Here the valence of the Np sites is expected to be Np(V). We observe a magnetic transition below 8 K, where the transition temperature is dependent on the effective magnetic moment. Although the transition appears to be ferromagnetic, no hysteresis is seen in the magnetization, and the saturation moment above 0.1 T is found to be about 60% of the free NPO2 ion moment. The decrease in the Np moments determined experimentally is thought to arise from crystal field and spin-orbit effects. We observe temperature dependent ESR spectra at similar to44 GHz (for fields above the saturation field) that show slight shifts in the g-factor and line width at low temperatures. Our results provide evidence that both Np(V) and Np(IV) valences are present, where the latter may be a minority population. The crystals, although dark in appearance, are electrically insulating (p > 10(10) Omegacm) at room temperature. (C) 2004 Elsevier Ltd. All rights reserved.
机译:我们报告了β-AgNPO2(SeO3)单晶的磁化,磁化率,电传输和电子自旋共振(ESR)研究。在此,Np位的价预期为Np(V)。我们观察到低于8 K的磁转变,其中转变温度取决于有效磁矩。尽管过渡似乎是铁磁性的,但在磁化过程中没有看到磁滞现象,并且发现高于0.1 T的饱和力矩约为自由NPO2离子力矩的60%。实验确定的Np矩的减少被认为是由于晶场和自旋轨道效应引起的。我们观察到与温度相关的ESR光谱类似于44 GHz(对于高于饱和磁场的场),在低温下显示g因子和线宽略有变化。我们的结果提供了证据,表明同时存在Np(V)和Np(IV)价,其中后者可能是少数民族。晶体虽然外观较暗,但在室温下是电绝缘的(p> 10(10)Ωcm)。 (C)2004 Elsevier Ltd.保留所有权利。

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