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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:
 [1];  [1];  [2];  [3];  [4];  [5];  [1];  [6]
  1. ORNL
  2. University of St. Andrews, Scotland
  3. University of Tennessee, Knoxville (UTK)
  4. {F E } [ORNL
  5. Los Alamos National Laboratory (LANL)
  6. ISIS Facility, Rutherford Appleton Laboratory
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
978207
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Materials; Journal Volume: 5
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COVALENCE; CUPRATES; DIFFRACTION; FERROMAGNETISM; FLUORIDES; MAGNETISM; NEUTRONS; ORIGIN; SCATTERING; SILVER; VALENCE

Citation Formats

McLain, Sylvia E, Dolgos, Michelle R, Tennant, D. A., Turner, John F. C., Barnes, Ted, Proffen, Th., Sales, Brian C, and Bewley, Robert I. Magnetic Behaviour of Layered Ag(ll) Fluorides. United States: N. p., 2006. Web. doi:10.1038/nmat1670.
McLain, Sylvia E, Dolgos, Michelle R, Tennant, D. A., Turner, John F. C., Barnes, Ted, Proffen, Th., Sales, Brian C, & Bewley, Robert I. Magnetic Behaviour of Layered Ag(ll) Fluorides. United States. doi:10.1038/nmat1670.
McLain, Sylvia E, Dolgos, Michelle R, Tennant, D. A., Turner, John F. C., Barnes, Ted, Proffen, Th., Sales, Brian C, and Bewley, Robert I. Sun . "Magnetic Behaviour of Layered Ag(ll) Fluorides". United States. doi:10.1038/nmat1670.
@article{osti_978207,
title = {Magnetic Behaviour of Layered Ag(ll) Fluorides},
author = {McLain, Sylvia E and Dolgos, Michelle R and Tennant, D. A. and Turner, John F. C. and Barnes, Ted and Proffen, Th. and Sales, Brian C and Bewley, Robert I.},
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 = {Nature Materials},
number = ,
volume = 5,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}