Structural distortion and incommensurate noncollinear magnetism in EuAg4As2

Bing Shen, Chaowei Hu, Huibo Cao, Xin Gui, Eve Emmanouilidou, Weiwei Xie, Ni Ni

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Layered pnictide materials have provided a fruitful platform to study various emergent phenomena, including superconductivity, magnetism, charge density waves, etc. Here we report the observation of structural distortion and noncollinear magnetism in layered pnictide EuAg4As2 via transport, magnetization, single crystal x-ray, and neutron diffraction data. EuAg4As2 single crystal shows a structural distortion at 120 K, where two sets of superlattice peaks with the propagation vectors of q1=±(0, 0.25, 0.5) and q2=±(0.25, 0, 1) emerge. Between 9-15 K, the hexagonal Eu2+ sublattice enters an unpinned incommensurate magnetic state, with magnetic Bragg reflections pictured as circular sectors. Below 9 K, it orders in an incommensurate noncollinear antiferromagnetic state with a well-defined propagation wavevector of (0, 0.1, 0.12) and a very rare magnetic structure, which is helical along the c axis and cycloidal along the b axis with a moment of 6.4 μB/Eu2+. Furthermore, rich magnetic phases under magnetic fields, large magnetoresistance, and strong coupling between charge carriers and magnetism in EuAg4As2 are revealed.

Original languageEnglish (US)
Article number064419
JournalPhysical Review Materials
Issue number6
StatePublished - Jun 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Structural distortion and incommensurate noncollinear magnetism in EuAg4As2'. Together they form a unique fingerprint.

Cite this