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Title: Magnetic Behaviour of Layered Ag(ll) Fluorides

Abstract

Fluoride phases that contain the spin-1/2 4d{sup 9} Ag(II) ion have recently been predicted to have interesting or unusual magnetochemistry, owing to their structural similarity to the 3d{sup 9} Cu(II) cuprates and the covalence associated with this unusual oxidation state of silver. Here we present a comprehensive study of structure and magnetism in the layered Ag(II) fluoride Cs{sub 2}AgF{sub 4}, using magnetic susceptometry, inelastic neutron scattering techniques and both X-ray and neutron powder diffraction. We find that this material is well described as a two-dimensional ferromagnet, in sharp contrast to the high-T{sub C} cuprates and a previous report in the literature. Analyses of the structural data show that Cs{sub 2}AgF{sub 4} is orbitally ordered at all temperatures of measurement. Therefore, we suggest that orbital ordering may be the origin of the ferromagnetism we observe in this material.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914003
Report Number(s):
BNL-78571-2007-JA
TRN: US0801466
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nat. Mater.; Journal Volume: 5
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COVALENCE; CUPRATES; DIFFRACTION; FERROMAGNETISM; FLUORIDES; MAGNETISM; NEUTRONS; ORIGIN; SCATTERING; SILVER; NSLS; national synchrotron light source

Citation Formats

McLain,S., Dolgos, M., Tennant, D., Turner, J., Barnes, T., Proffen, T., Sales, B., and Bewley, R.. Magnetic Behaviour of Layered Ag(ll) Fluorides. United States: N. p., 2006. Web. doi:10.1038/nmat1670.
McLain,S., Dolgos, M., Tennant, D., Turner, J., Barnes, T., Proffen, T., Sales, B., & Bewley, R.. Magnetic Behaviour of Layered Ag(ll) Fluorides. United States. doi:10.1038/nmat1670.
McLain,S., Dolgos, M., Tennant, D., Turner, J., Barnes, T., Proffen, T., Sales, B., and Bewley, R.. Sun . "Magnetic Behaviour of Layered Ag(ll) Fluorides". United States. doi:10.1038/nmat1670.
@article{osti_914003,
title = {Magnetic Behaviour of Layered Ag(ll) Fluorides},
author = {McLain,S. and Dolgos, M. and Tennant, D. and Turner, J. and Barnes, T. and Proffen, T. and Sales, B. and Bewley, R.},
abstractNote = {Fluoride phases that contain the spin-1/2 4d{sup 9} Ag(II) ion have recently been predicted to have interesting or unusual magnetochemistry, owing to their structural similarity to the 3d{sup 9} Cu(II) cuprates and the covalence associated with this unusual oxidation state of silver. Here we present a comprehensive study of structure and magnetism in the layered Ag(II) fluoride Cs{sub 2}AgF{sub 4}, using magnetic susceptometry, inelastic neutron scattering techniques and both X-ray and neutron powder diffraction. We find that this material is well described as a two-dimensional ferromagnet, in sharp contrast to the high-T{sub C} cuprates and a previous report in the literature. Analyses of the structural data show that Cs{sub 2}AgF{sub 4} is orbitally ordered at all temperatures of measurement. Therefore, we suggest that orbital ordering may be the origin of the ferromagnetism we observe in this material.},
doi = {10.1038/nmat1670},
journal = {Nat. Mater.},
number = ,
volume = 5,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}