Paramagnetic Resonance Spectrum of Mn^<++> in NaCl Single Crystal

概要

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The paramagnetic resonance spectrum of Mn^<++> ions contained in NaCl single crystal with concentrations of 1〜3 × 10^<-4> in mole fraction has been investigated. From the analysis of the spectrum the existence of Mn^<++> -Na^+ vacancy complex, in which a Na^+ vacancy is at one of the nearest neighbor positions with respect to the Mn^<++> ion, has been verified at room temperature in crystals quenched from high temperatures. However, this state of Mn^<++> ion is unstable at room temperature, and such complexes diffuse through the lattice to form aggregates of Mn^<++> ions. The ground level splitting parameters of a Mn^<++> ion accompanying a Na^+ vacancy at one of its nearest neighbor positions have been obtained as follows: D = 137.9±1 gauss, E = 51.4±0.4 gauss, where D and E represent the parameters in the spin Hamiltonian, D[S_x^2-1/3・S(S+1)]+E(S_x^2-S_y^2), in which z axis is in the direction of Mn^++ -Na^+ vacancy and y axis along the cubic axis perpendicular to it.
社団法人日本物理学会の論文
1958-10-05