中价锡化物CeRuSn的~（119）Sn固态NMR和穆斯堡尔谱学研究
119Sn solid state NMR and Mössbauer spectroscopic studies of the intermediate-valent stannide CeRuSn
摘要：
三元锡化物CeRuSn是一种静态的混合价铈化合物，三价铈和中价铈在两个不同的晶位上有序排列。119 Sn穆斯堡尔谱在323 K时显示出两个电子几乎相同的锡原子，而在298 K及以下（77和4.2 K）时，可以清楚地区分出两个锡原子。119 Sn固体核磁共振实验进行探测局部超精细场在两个不同的Sn网站。119 Sn NMR粉末谱很好地拟合了两个具有几乎相同的磁各向异性但具有不同绝对位移值的Sn位点。这两个锡网站的强烈影响交叉之间的100和280 K的过渡。该现场研究证实了在先前调查中发现的上部结构调制。随着温度的降低，粉末光谱变宽，这为反铁磁有序的基态提供了有力的证据。
英文摘要：
The ternary stannide CeRuSn is a static mixed-valent cerium compound with an or-dering of trivalent and intermediate-valent cerium on two distinct crystallographic sites. 119Sn Mössbauer spectra showed two electronically almost identical tin atoms at 323 K, while at 298 K and below (77 and 4.2 K) two tin sites can clearly be distinguished. 119Sn solid state NMR experiments are performed to probe the local hyperfine fields at the two different Sn sites. 119Sn NMR powder spectra are nicely fitted with two Sn sites with nearly the same magnetic anisotropy, but with different absolute shift values. Both Sn sites are strongly affected by crossover-like transitions between 100 and 280 K. This local-site study confirms the superstructure modulations found in previous investiga-tions. Towards lower temperatures the powder spectra are broadened giving strong evidence for the antiferromagnetically ordered ground state.
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