Abstract
Paramagnetic resonance methods have been used to investigate Ir-Ir exchange interactions in K
2
IrCl
6
and (NH
4
)
2
IrCl
6
. Measurements are described of the resonance spectrum from nearest-neighbour pairs of Ir ions in semi-dilute mixed crystals where Pt is substituted for Ir. The results show that the isotropic p art of the Ir-Ir exchange,
J
/
k
, is antiferromagnetic and of magnitude 11.5 ± 1°K and 7.5 ± 1°K for the potassium and ammonium salts, respectively. There is also found to be an anisotropic part with rhombic symmetry and with magnitude of order 1 cm
-1
. No lines attributable to next-nearest-neighbour pairs were found, and it is suggested that this interaction is small. The results are com pared briefly with the magnetic susceptibility experiments of Cooke
et al
. (part II) who find that the concentrated salts go antiferromagnetic in the liquid-helium temperature range, and also with the theoretical analysis of the superexchange mechanism given by Judd (part III).
Reference30 articles.
1. constant for n.n. for n.n. for
2. salt a (A)
3. K 2PtC 16 9-725
4. (NH4)21rCl 6 9-87
5. (NH4)2PtC 16 9-834 u (A) (A) a and u
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