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Spin excitations in 3D molecular magnets probed by neutron scattering

Spin excitations in 3D molecular magnets probed by neutron scattering
Spin excitations in 3D molecular magnets probed by neutron scattering
The emerging field of molecular magnetism constitutes a new branch of materials science that deals with the magnetic properties of molecules, or assemblies of molecules, that contain magnetic centers. The growing interest in understanding the origin of the magnetic ordering in these materials is to obtain novel multiproperty molecular magnetic materials with high transition temperatures. Molecules based on the dicyanamide ion [NLC-N-CLN], abbreviated (dca), such as M(dca)2 [M=Mn, Ni], have shown interesting bulk properties that prompted our inelastic neutron scattering (INS) studies. While the Mn2+ ion is isotropic because of its L=0 configuration, the isostructural Ni analog has S=1 and demonstrates marked single-ion anisotropy. Mn(dca)2 is a canted antiferromagnet below 16 K, while Ni(dca)2 is a ferromagnet below 21 K. INS has been used to investigate the magnetic excitations in Mn(dca)2 and Ni(dca)2. For Mn(dca)2, a Heisenberg model gives good correspondence with the experimental results.
0947-8396
S634-S636
Bordallo, H.N.
567b6f35-fa1c-4d30-990c-5717b5ae0222
Chapon, L.C.
c07fa1c9-cab1-4bd8-832e-0eb2d050cfa7
Cook, J.C.
ec60255d-f210-4427-ba71-12811a21481b
Copley, J.R.D.
d792ac5f-b7b6-42ca-9bef-bb64cdbc40e8
Goremychkin, E.
7eff4a1f-8f7d-43b1-a419-90b7823fc679
Kern, S.
6b96426b-850e-45ee-9af9-d446c927a182
Lee, S.-H.
f54130b8-3e0d-4301-a586-7c826e1de503
Yildirim, T.
43a0ae10-e002-4c05-b80c-6fa361911c7f
Manson, J.L.
9f03bc8b-ce8d-4a02-9614-8064e9833237
Bordallo, H.N.
567b6f35-fa1c-4d30-990c-5717b5ae0222
Chapon, L.C.
c07fa1c9-cab1-4bd8-832e-0eb2d050cfa7
Cook, J.C.
ec60255d-f210-4427-ba71-12811a21481b
Copley, J.R.D.
d792ac5f-b7b6-42ca-9bef-bb64cdbc40e8
Goremychkin, E.
7eff4a1f-8f7d-43b1-a419-90b7823fc679
Kern, S.
6b96426b-850e-45ee-9af9-d446c927a182
Lee, S.-H.
f54130b8-3e0d-4301-a586-7c826e1de503
Yildirim, T.
43a0ae10-e002-4c05-b80c-6fa361911c7f
Manson, J.L.
9f03bc8b-ce8d-4a02-9614-8064e9833237

Bordallo, H.N., Chapon, L.C., Cook, J.C., Copley, J.R.D., Goremychkin, E., Kern, S., Lee, S.-H., Yildirim, T. and Manson, J.L. (2002) Spin excitations in 3D molecular magnets probed by neutron scattering. Applied Physics A: Materials Science & Processing, 74 (Supplement 1), S634-S636. (doi:10.1007/s003390201350).

Record type: Article

Abstract

The emerging field of molecular magnetism constitutes a new branch of materials science that deals with the magnetic properties of molecules, or assemblies of molecules, that contain magnetic centers. The growing interest in understanding the origin of the magnetic ordering in these materials is to obtain novel multiproperty molecular magnetic materials with high transition temperatures. Molecules based on the dicyanamide ion [NLC-N-CLN], abbreviated (dca), such as M(dca)2 [M=Mn, Ni], have shown interesting bulk properties that prompted our inelastic neutron scattering (INS) studies. While the Mn2+ ion is isotropic because of its L=0 configuration, the isostructural Ni analog has S=1 and demonstrates marked single-ion anisotropy. Mn(dca)2 is a canted antiferromagnet below 16 K, while Ni(dca)2 is a ferromagnet below 21 K. INS has been used to investigate the magnetic excitations in Mn(dca)2 and Ni(dca)2. For Mn(dca)2, a Heisenberg model gives good correspondence with the experimental results.

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Published date: December 2002

Identifiers

Local EPrints ID: 57100
URI: http://eprints.soton.ac.uk/id/eprint/57100
ISSN: 0947-8396
PURE UUID: 936e86f8-7695-4bbc-86eb-6ee08a43322b

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Date deposited: 07 Aug 2008
Last modified: 06 Oct 2020 23:46

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