Structural evolution and magnetic properties of anionic clusters Cr2Gen (n = 3-14): Photoelectron spectroscopy and density functional theory computation

Xiaoqing Liang, Xiangyu Kong, Sheng Jie Lu, Yingying Huang, Jijun Zhao, Hong Guang Xu, Weijun Zheng, Xiao Cheng Zeng

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The structural, electronic and magnetic properties of dual Cr atoms doped germanium anionic clusters, Cr2Ge.n (n = 3.14), have been investigated by using photoelectron spectroscopy in combination with density-functional theory calculations. The low-lying structures of Cr2Ge.n are determined by DFT based genetic algorithm optimization. For Cr2Ge.n with n . 8, the structures are bipyramid-based geometries, while Cr2Ge.9 cluster has an opening cage-like structure, and the half-encapsulated structure is gradually covered by the additional Ge atoms to form closed-cage configuration with one Cr atom interior for n = 10 to 14. Meanwhile, the two Cr atoms in Cr2Ge.n clusters tend to form a Cr.Cr bond rather than be separated. Interestingly, the magnetic moment of all the anionic clusters considered is 1 B. Almost all clusters exhibit antiferromagnetic Cr.Cr coupling, except for two clusters, Cr2Ge.5 and Cr2Ge.6 . To our knowledge, the Cr2Ge.n cluster is the first kind of transition-metal doped semiconductor clusters that exhibit relatively stable antiferromagnetism within a wide size range. The experimental/theoretical results suggest high potential to modify the magnetic behavior of semiconductor clusters through introducing different transition-metal dopant atoms.

Original languageEnglish (US)
Article number335501
JournalJournal of Physics Condensed Matter
Volume30
Issue number33
DOIs
StatePublished - Jul 26 2018

Keywords

  • antiferromagnetic
  • chromium doping
  • ferromagnetic
  • germanium cluster
  • photoelectron spectrum

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Structural evolution and magnetic properties of anionic clusters Cr<sub>2</sub>Ge<sub>n</sub> (n = 3-14): Photoelectron spectroscopy and density functional theory computation'. Together they form a unique fingerprint.

  • Cite this