Neutron-scattering study of Fe-substitution effect on the static spin correlation in La 2-xSr xNiO 4

T. Imasato, M. Fujita, M. Matsuura, M. Enoki, K. Yamada

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We have performed elastic neutron scattering measurements on the Fe-doped La 2-xSr xNiO 4 (LSNO) with 0.12 ≤ x ≤ 0.50 to study the magnetic impurity effects on the static spin correlations. In the pristine LSNO system, it is well known that both spin and charge stripe orders are stabilized at low temperatures in the wide hole concentration range from 0.12 to 0.70. The incommensurability (ε) increases upon Sr-doping and tends to saturate with ε max ̃ 0.47 (r.l.u.) for x > 0.5. We found that 4% Fe-substitution for Ni ion reduces ε at the fixed Sr concentration for the all measured samples with 0.12 ≤ x ≤ 0.5. The ε in the Fe-substituted samples with x = 0.25, 0.33, 0.37 and 0.50 was 0.02 ̃ 0.04 (r.l.u.) smaller than that in the pristine samples. Furthermore, we observed commensurate peak in the Fe-doped x = 0.12 sample. No welldefined incommensurate magnetic peaks were detected, unlike to the result for the pristine x = 0.12 sample. The effect of Fe-substitution on the magnetic ordering temperature (T spin) is rather weaker compared with the rapid increase of T spin by Fe-doping in the isostructural La 2-xSr xCuO 4 (LSCO) system. On the other hand, the correlation length shortens by Fe-substitution, similar to the case of LSCO. These results are discussed from the viewpoint of degradation of stripe correlation by the randomly doped Fe ions on NiO 2 plane and the reduction of effective carrier concentration.

Original languageEnglish
Article numberSB027
JournalJournal of the Physical Society of Japan
Issue numberSUPPL. B
Publication statusPublished - 2011 Dec


  • Impurity effect
  • La SrxNiO
  • Neutron-scattering
  • Stripe order


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