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Title: Antiferromagnetic semiconductor Eu3Sn2P4 with Sn–Sn dimer and crown-wrapped Eu

Journal Article · · Journal of Materials Chemistry C
DOI: https://doi.org/10.1039/c9tc03557e · OSTI ID:1668264
 [1];  [2];  [1];  [1]; ORCiD logo [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Ames Lab., and Iowa State Univ., Ames, IA (United States); Polish Academy of Sciences, Wroclaw (Poland). Inst. of Low Temperature and Structure Research

A novel antiferromagnetic semiconductor, Eu3Sn2P4, has been discovered. Single crystals of Eu3Sn2P4 were prepared using the Sn self-flux method. The crystal structure determined by single crystal X-ray diffraction shows that Eu3Sn2P4 crystallizes in the orthorhombic structure with the space group Cmca (Pearson Symbol, oP216). Furthermore, six Sn–Sn dimers connected by P atoms form a Sn12P24 crown-shaped cluster with a Eu atom located in the center. Magnetization measurements indicate that the system orders antiferromagnetically below a TN ~14 K at a low field and undergoes a metamagnetic transition at a high field when T < TN. The effective magnetic moment is 7.41(3) μB per Eu, corresponding to Eu2+. The electric resistivity reveals a non-monotonic temperature dependence with non-metallic behavior below ~60 K, consistent with the band structure calculations. By fitting the data using the thermally activated resistivity formula, we estimate the energy gap to be ~0.14 eV. Below TN, the resistivity tends to saturate, suggesting the reduction of charge-spin scattering.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
National Science Foundation (NSF); State of Louisiana-Board of Regents Research Competitiveness Subprogram (RCS); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-07CH11358; SC0016315
OSTI ID:
1668264
Report Number(s):
IS-J--10,065
Journal Information:
Journal of Materials Chemistry C, Journal Name: Journal of Materials Chemistry C Journal Issue: 40 Vol. 7; ISSN 2050-7526
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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