Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11628
Title: Striped magnetic ground state of the ideal kagomé lattice compound Fe4Si2Sn7O16
Authors: Ling, CD
Allison, MC
Schmid, S
Avdeev, M
Gardner, JS
Ryan, DH
Soehnel, T
Keywords: Neutron diffraction
Antiferromagnetism
Ground states
Crystal lattices
Moessbauer spectrometers
Magnetization
Issue Date: 3-Dec-2017
Publisher: Society of Crystallographers in Australia and New Zealand
Citation: Ling, C. D., Allison, M. C., Schmid, S. A., Avdeev, M., Gardner, J. S., Ryan, D. H., & Soehnel, T. (2017). Striped magnetic ground state of the ideal kagomé lattice compound Fe4Si2Sn7O16. Paper presented at CRYSTAL 31, the 31st Biennial Conference of the Society of Crystallographers in Australia and New Zealand, Pullman Bunker Bay, Western Australia, 3 – 7 December 2017. Retrieved from: https://crystal31.com/wp-content/uploads/2017/11/SCANZ-Crystal-31-2017-Book-of-Abstracts-FINAL.pdf#page=13
Abstract: We have used representational symmetry analysis of neutron powder diffraction data to determine the magnetic ground state of Fe4Si2Sn7O16. We recently reported a long-range antiferromagnetic (AFM) Néel ordering transition in this compound at TN = 3.0 K, based on magnetisation measurements [1]. The only magnetic ions present are layers of high-spin Fe2+ (d6, S = 2) arranged on a perfect kagomé lattice (trigonal space group P-3m1). Below TN = 3.0 K, the spins on 2/3 of these magnetic ions order into canted antiferromagnetic chains, separated by the remaining 1/3 which are geometrically frustrated and show no long-range order down to at least T = 0.1 K [2]. Moessbauer spectroscopy shows that there is no static order on the latter 1/3 of the magnetic ions — i.e., they are in a liquid-like rather than a frozen state – down to at least 1.65 K. A heavily Mn-doped sample Fe1.45Mn2.55Si2Sn7O16 has the same ground state. Although the magnetic propagation vector k = (0, ½, ½) breaks hexagonal symmetry, we see no evidence for magnetostriction in the form of a lattice distortion within the resolution of our data. To the best of our knowledge, this type of magnetic order on a kagomé lattice has no precedent experimentally and has not been explicitly predicted theoretically. We will discuss the relationship between our experimental result and a number of theoretical models that predict symmetry-breaking ground states for perfect kagomé lattices.
URI: https://crystal31.com/wp-content/uploads/2017/11/SCANZ-Crystal-31-2017-Book-of-Abstracts-FINAL.pdf#page=13
https://apo.ansto.gov.au/dspace/handle/10238/11628
Appears in Collections:Conference Publications

Files in This Item:
File Description SizeFormat 
SCANZ-Crystal-31-2017-Book-of-Abstracts-FINAL.pdf3.22 MBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.