J.
Phys.: Condens. Matter 13 No 10 (12 March 2001) 2263-2270
PII: S0953-8984(01)17964-6
Muon-spin-rotation and magnetization study of metal-organic magnets based
on the dicyanamide anion
Th Jestädt1,
M Kurmoo2, S J Blundell1,
F L Pratt3, C J Kepert4,6,
K Prassides5, B W Lovett1,
I M Marshall1, A Husmann1,
K H Chow1,7, R M Valladares1,8,
C M Brown5 and A Lappas5
1 Oxford University Department of Physics, Clarendon Laboratory,
Parks Road, Oxford OX1 3PU, UK
2 IPCMS, 23 rue du Loess, BP 20/CR, 67037 Strasbourg Cédex,
France
3 RIKEN-RAL, ISIS, Rutherford Appleton Laboratory, Didcot
OX11 0QX, UK
4 Inorganic Chemistry Laboratory, Oxford University, South
Parks Road, Oxford OX1 3QR, UK
5 School of Chemistry, Physics and Environmental Science,
University of Sussex, Falmer, Brighton BN1 9QJ, UK
6 Present address: School of Chemistry, Building F11, University
of Sydney, NSW 2006, Australia.
7 Present address: Department of Physics, Lehigh University,
16 Memorial Drive East, Bethlehem, PA 18015, USA.
8 Present address: Departamento de Física, Facultad
de Ciencias, UNAM, Apartado Postal 70-542, Mexico DF, 04510, Mexico.
Received 12 October 2000, in final form 7 February 2001
Abstract. We report the results of a study of the metal-organic
magnets MII[N(CN)2]2,
where MII = Ni,
Co and Mn, using bulk magnetization and muon-spin relaxation (µSR).
Implanted muons are sensitive to the onset of long-range magnetic order
in each of these materials and strong muon-spin relaxation is observed
in the paramagnetic state due to low-frequency fluctuations of the electronic
moments in the 109-1010 Hz range. The size of the
muon-spin relaxation in the paramagnetic state can be related to the magnitude
of the transition-metal-ion moment. Very strongly damped oscillations are
observed below the magnetic transition temperature in Co[N(CN)2]2.
Link
to the Journal of Physics page.
Thomas Jestädt, 2001.
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