Size, disorder, and charge doping effects in the antiferromagnetic series Eu1-xAxGa4 (A = Ca, Sr, or La)

Macy Stavinoha, C. L. Huang, Kasey P. Devlin, James C. Fettinger, Susan M. Kauzlarich, E. Morosan

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

EuGa4 hosts a magnetic Eu2+ sublattice surrounded by a network of covalently-bound Ga atoms with the BaAl4 structure type (space group I4/mmm). In this study, we present the synthesis and characterization of three new single crystal substitutional series EuAx1−xGa4 with A ​= ​Ca, Sr, or La. X-ray diffraction and resistivity measurements show that Ca substitution induced a structural phase transition from the tetragonal crystal structure at high temperatures to the monoclinic crystal structure (CaGa4 type, space group C2/m) at low temperatures and suppressed the antiferromagnetic ordering temperature to 8.8 ​K for x ​= ​0.45. Comparatively, La or Sr substitution maintained the tetragonal crystal structure and suppressed the antiferromagnetic ordering temperatures to 6.7 ​K and 1.6 ​K for (A, x) = (La, 0.37) and (Sr, 0.91), respectively. In addition to suppressing the magnetic order, magnetization and specific heat measurements indicate the onset of anisotropic metamagnetic transitions in (La, 0.18), (La, 0.37), and (Sr, 0.63), along with an incommensurate-to-commensurate magnetic transition in (Sr, 0.38). By comparing these effects of doping EuGa4, we show how size, disorder, and charge determine the structure-physical property relations in EuGa4.

原文English
文章編號121232
期刊Journal of Solid State Chemistry
285
DOIs
出版狀態Published - 2020 5月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 陶瓷和複合材料
  • 凝聚態物理學
  • 物理與理論化學
  • 無機化學
  • 材料化學

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