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Role of CeNiSi2 and BaNiSn3 Structure Types in the Emergent Magnetism of the Homologous Series Lnn+1MnX3n+1:Ce4Fe3Ge10

Journal Article · · Chemistry of Materials
 [1];  [2];  [3];  [4];  [3]
  1. Baylor University, Waco, TX (United States); Baylor University
  2. University of Idaho, Moscow, ID (United States)
  3. Baylor University, Waco, TX (United States)
  4. University of California, Santa Cruz, CA (United States)

The synthesis and characterization of Ce4Fe3Ge10, n =3 member of the homologous series Lnn+1MnX3n+1 (Ln = lanthanides, M = transition metal, X = tetrel), is reported. The structure can be modelled with the Cmcm space group adopting the Eu2Ni2-xSn5 structure type, with lattice parameters of a = 4.3323 (15) Å, b = 35.507 (9) Å, and c = 4.3069 (12) Å. Members of the series for n > 2 consist of stacking of ordered (CeNiSi2 type) and disordered (BaNiSn3/ AuCu3 type) subunits with the acting as a “spacer” between CeNiSi2 subunits. Although neither CeFeGe3 nor CeFe0.63Ge2 order magnetically down to 2 K, Ce4Fe3Ge10 is an antiferromagnet below 3.6 K. To rationalize the emergent magnetism: (i) we established the Kondo and RKKY interaction dominant regions for the Ce analogues adopting the BaNiSn3 and CeNiSi2 by creating an electronic landscape for each, (ii) mapped the strained subunits, due to stacking, within the series. Here, we established the CeFeGe3 subunit within Ce4Fe3Ge10 contracts and is located within the Kondo-interaction dominant region, while the CeFe0.63Ge2 subunit expands and is in the RKKY-interaction dominant region.

Research Organization:
Baylor University, Waco, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0022854
OSTI ID:
2503905
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 17 Vol. 36; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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