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). 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.
Bibliographical noteFunding Information:
J. B. is supported by the State of Louisiana-Board of Regents Research Competitiveness Subprogram (RCS) under Contract Number LEQSF(2017–20)-RD-A-08. W. X. is supported by Beckman Young Investigator (BYI) Program. X. G. is supported by the National Science Foundation under NSF-OIA-1832967. R. J. is supported by the DOE DE-SC0016315. P. S.’s work at Ames Laboratory (electronic structure calculations) was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, and the Interdisciplinary Centre for Mathematical and Computational Modelling (ICM) University of Warsaw under grant no. GB76-4, and at the Wrocław Centre for Networking and Supercomputing under grant no. 359. Ames Laboratory is operated for the US Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.
This journal is © The Royal Society of Chemistry.