Structural distortion and incommensurate noncollinear magnetism in EuAg4As2

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

doi:10.1103/PhysRevMaterials.4.064419

Structural distortion and incommensurate noncollinear magnetism in EuAg4As2

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

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

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 language	English
Article number	064419
Journal	Physical Review Materials
Volume	4
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevMaterials.4.064419
State	Published - Jun 2020

Funding

We thank Prof. Paul. C. Canfield, Dr. Sergey and Prof. D. H. Ryan for useful discussion and encouragement to finish and publish this work. Work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0011978. Work at ORNL's High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE. Work at LSU was supported by NSF-DMR-1944965.

Funders	Funder number
Scientific User Facilities Division	NSF-DMR-1944965
U.S. Department of Energy
Office of Science
Basic Energy Sciences	DE-SC0011978
University of California, Los Angeles

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title = "Structural distortion and incommensurate noncollinear magnetism in EuAg4As2",

abstract = "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.",

author = "Bing Shen and Chaowei Hu and Huibo Cao and Xin Gui and Eve Emmanouilidou and Weiwei Xie and Ni Ni",

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AU - Xie, Weiwei

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AB - 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.

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Structural distortion and incommensurate noncollinear magnetism in EuAg4As2

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