MOSSBAUER OBSERVATION OF THE QUANTUM LEVELS OF FE3+ IONS DOPED IN 1D ISING FERROMAGNET CA3CO2O6

We have measured the Mossbauer effect of Fe-57(3+) (S = 5/2) ions dope d in a 1D Ising ferromagnet Ca3Co2O6. The spectra with hyperfine field s corresponding to the exchange polarized Fe electron spins with m(z) = +/-5/2, +/-3/2, +/-1/2 are first observed in the magnetically dense system for T less than or equal to 20 K, suggesting slow magnetic rela xation at the Fe3+ sites. The key lies in the large difference between magnetic characters of the host (Ising) and impurity (Heisenberg) spi ns, making the impurity spins extremely isolated in the host 1D Ising spin system.