Antiperovskite Gd3SnC: Unusual Coexistence of Ferromagnetism and Heavy Fermions in Gd Lattice

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Inverted structures of common crystal lattices, referred to as antistructures, are rare in nature due to their thermodynamic constraints imposed by the switched cation and anion positions in reference to the original structure. However, a stable antistructure formed with mixed bonding characters of constituent elements in unusual valence states can provide unexpected material properties. Here, a heavy-fermion behavior of ferromagnetic gadolinium lattice in Gd3SnC antiperovskite is reported, contradicting the common belief that ferromagnetic gadolinium cannot be a heavy-fermion system due to the deep energy level of localized 4f-electrons. The specific heat shows an unusually large Sommerfeld coefficient of approximate to 1114 mJ mol(-1) K-2 with a logarithmic behavior of non-Fermi-liquid state. It is demonstrated that the heavy-fermion behavior in the non-Fermi-liquid state appears to arise from the hybridized electronic states of gadolinium 5d-electrons participating in metallic Gd-Gd and covalent Gd-C bonds. These results accentuate the unusual chemical bonds in CGd6 octahedra with the dual characters of gadolinium 5d-electrons for the emergence of heavy fermions.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2021-09
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS, v.33, no.37, pp.2102958

ISSN
0935-9648
DOI
10.1002/adma.202102958
URI
http://hdl.handle.net/10203/287827
Appears in Collection
PH-Journal Papers(저널논문)
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