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Transport integrals I_n(Θ_D/T) are reviewed with their applications in solid-state physics, molecular dynamics, and electron spin-lattice relaxation. Analytical approximations of I_n for n=2-8 are proposed as applicable for computer fitting procedures in the range of the variable x=Θ_D/T from 0.1 to 40. The results are applied for description of the spin-lattice relaxation data collected for Cu^{2+}...
The K_3H(SO_4)_2 doped with Cu^{2+} ion was studied in detail by X-band CW EPR. Two kinds of Cu^{2+} complexes (magnetically and structurally nonequivalent) denoted as Cu^{2+}(I) and Cu^{2+}(II) were found. Spin-Hamiltonian parameters, direction cosines, and coordination of Cu^{2+} ion were determined at room temperature. The superhyperfine structure was observed below 250 K as a result of interacting...
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