Anomalous diamagnetism of electride electrons in transition metal silicides
Anomalous diamagnetism of electride electrons in transition metal silicides
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过渡金属硅化物中电子的反磁性
DOI：
10.1103/physrevb.103.l241101
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发表时间：
2021
影响因子：
3.7
通讯作者：
Hosono H.
中科院分区：
文献类型：
--
作者：
Hiraishi M.;Kojima K. M.;Okabe H.;Koda A.;Kadono R.;Wu J.;Lu Y.;Hosono H.
金属间硅化化合物lassi和以氢(H)储存材料而闻名，作为阴离子被未束缚电子取代的电子的候选者而引起人们的注意。从一个μ子自旋实验中可以推断出，在外加磁场作用下，这些化合物中μ子位（与H位相同）的局域场表现出较大的负移，且基本与温度无关。这种异常的抗磁性标志着与过渡金属相关的电子的独特性质。抗磁位移随H含量的增加而减小，说明在空心间隙位置上相干存在的电子被H吸附形成氢化物离子。
Intermetallic silicide compounds, LaScSi and, known for being hydrogen (H) storage materials, are drawing attention as candidates for electrides in which anions are substituted by unbound electrons. It is inferred from a muon spin rotation experiment that the local field at the muon site (which is the same site as that for H) in these compounds exhibits a large negative shift under an external magnetic field, which is mostly independent of temperature. Such anomalous diamagnetism signals a unique property of electride electrons associated with transition metals. Moreover, the diamagnetic shift decreases with increasing H content, suggesting that the electride electrons existing coherently in the hollow interstitial positions are adsorbed by H to form hydride ions.