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

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Title
Antiperovskite Gd3SnC: Unusual Coexistence of Ferromagnetism and Heavy Fermions in Gd Lattice
Author(s)
Bang, Joonho; Park, Jongho; Lee, Kimoon; Minsoo Kim; Wonshik Kyung; Denlinger, Jonathan D.; Kim, Yeongkwan; Young Hee Lee; Changyoung Kim; Sung Wng Kim
Publication Date
2021-09
Journal
ADVANCED MATERIALS, v.33, no.37
Publisher
WILEY-V C H VERLAG GMBH
Abstract
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.
URI
https://pr.ibs.re.kr/handle/8788114/10401
DOI
10.1002/adma.202102958
ISSN
0935-9648
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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