Inelastic neutron scattering study of stripe and overdoped checkerboard ordering in layered nickel oxide Nd2-xSrxNiO4

Yoichi Ikeda, Shota Suzuki, Takuya Nakabayashi, Hideki Yoshizawa, Tetsuya Yokoo, Shinichi Itoh

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4 Citations (Scopus)

Abstract

We have investigated magnetic excitations in both the stripe (x < 0.5) and overdoped checkerboard (CB) (x ≥ 0.5) regions in Nd2-xSrxNiO4 (x = 0.33, 0.60, and 0.70) samples by inelastic neutron scattering. The magnetic excitations of Nd1.67Sr0.33NiO4 in the stripe region can be described by the linear spin wave theory with the same exchange constants as estimated for La5/3Sr1/3NiO4. In strong contrast to the well-defined spin wave excitations in the stripe region, the CBordered x = 0.60 and 0.70 samples show nondispersive broad magnetic excitation spectra. The broad feature of the excitation spectra in the CB region appears to be independent of the hole concentration up to x = 0.7. We discuss the origin of the broad excitation spectra and the robustness of the CB order above x > 0.5.

Original languageEnglish
Article numbere023701
Journaljournal of the physical society of japan
Volume85
Issue number2
DOIs
Publication statusPublished - 2016 Feb 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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