Spin–spin interaction of Ni[sup 2+] ions in ZnSiF[sub 6]·6H[sub 2]O

Krygin, I. M.; Prokhorov, A. D.
September 1999
Physics of the Solid State;Sep99, Vol. 41 Issue 9, p1469
Academic Journal
The angular dependences of the electron spin resonance spectrum of 1% Ni[sup 2+] ions in a ZnSiF[sub 6] · 6H[sub 2]O matrix are investigated experimentally at 36 GHz and 4.2 K. Besides the main spectrum of the isolated ion, we observed a spectrum due to interacting pairs of Ni[sup 2+] ions, located in the first (nn) and second (2n) coordination spheres and coupled by, besides the magnetic dipole-dipole interaction, isotropic exchange: J[sub nn] = (-197 ± 1) × 10[sup -4], J[sub 2nα] = (-5 ± 1) × 10[sup -4], and J[sub 2nβ] = (3 ± 2) × 10[sup -4] cm[sup -1]. Lines due to other isolated Ni[sup 2+] ions, which have a different initial splitting D, are also present in the spectrum with intensity comparable to the pair spectrum. Low-symmetry distortions of the crystal field are observed, caused by a pair of impurity ions located close to one another. It is shown that the previously proposed interpretation is incorrect.


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