Impurity Spin Resonance in Antiferromagnetic CoCl22H2O

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Abstract
Electron spin resonance of Mn 2+ ions in antiferromagnetic CoCl 2 2H 2 O was investigated using microwaves and pulsed magnetic fields. The results indicate that the Mn 2+ ion couples with surrounding Co spins by relatively weak exchange interactions and the effective spin Hamiltonian can be written by \begin{aligned} \textbf{\itshape H}{=}g_{0}\mu_{B}(\textbf{\itshape H}_{0}+\textbf{\itshape H}_{E})\textbf{\itshape S}_{0}+DS_{0z}^{2}, \end{aligned} where the first term represents the Zeeman energy of the impurity spin S 0 under an external magnetic field H 0 and the resultant effective field H E coming from the neighboring Co spins. By analyzing the experimental results, three exchange constants J 0 ', J 1 ' and J 2 ' are obtained as J 0 '(F)=0.59±0.04 cm -1 , J 1 '(AF)=0.73±0.02 cm -1 and J 2 '(AF)=0.23±0.03 cm -1 , where F and AF mean the ferromagnetic and antiferromagnetic coupling, respectively. D was determined to be -0.13±0.01 cm -1 .

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