Anomalous diamagnetism of electride electrons in transition metal silicides

Intermetallic silicide compounds, LaScSi and Y 5 Si 3 , 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 (...

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Bibliographic Details
Published in:Physical review. B 2021-06, Vol.103 (24), Article L241101
Main Authors: Hiraishi, M., Kojima, K. M., Okabe, H., Koda, A., Kadono, R., Wu, J., Lu, Y., Hosono, H.
Format: Article
Language:English
Subjects:
Diamagnetism
Electrons
Hydrogen storage
Intermetallic compounds
Metal silicides
Muon spin rotation
Silicides
Silicon
Transition metals
Yttrium
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Summary:Intermetallic silicide compounds, LaScSi and Y 5 Si 3 , 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 ( H − ) .
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.L241101