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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/29293621
Record Status
Checked
Record Id
29293621
Title
Spin wave excitations in the tetragonal double perovskite Sr2CuWO6
Contributors
HC Walker (STFC Rutherford Appleton Lab.)
,
O Mustonen
,
S Vasala
,
DJ Voneshen (STFC Rutherford Appleton Lab.)
,
MD Le (STFC Rutherford Appleton Lab.)
,
DT Adroja (STFC Rutherford Appleton Lab., and Johannesburg Univ.)
,
M Karppinen
Abstract
Sr2CuWO6 is a double perovskite proposed to be at the border between two- and three-dimensional magnetism, with a square lattice of S=1/2 Cu2+ ions. We have used inelastic neutron scattering to investigate the spin wave excitations of the system, to find out how they evolve as a function of temperature, as well as to obtain information about the magnetic exchange interactions. We observed well defined dispersive spin wave modes at 6 K, which partially survive above the magnetic ordering temperature TN=24 K. Linear spin wave theory is used to determine the exchange interactions revealing them to be highly two dimensional in nature. Density functional theory calculations are presented supporting this experimental finding, which is in contrast to a previous ab initio study of the magnetic interactions. Our analysis confirms that not the nearest neighbor, but the next nearest neighbor interactions in the tetragonal ab plane are the strongest. Low incident energy measurements reveal the opening of a 0.6(1) meV gap below TN, which suggests the presence of a very weak single ion anisotropy term in the form of an easy axis along (a) over cap.
Organisation
ISIS
,
ISIS-MERLIN
,
ISIS-LET
,
STFC
Keywords
Funding Information
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Language
English (EN)
Type
Details
URI(s)
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Year
Journal Article
Phys Rev B
94, no. 6 (2016): 064411.
doi:10.1103/PhysRevB.94.064411
2016
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