Magnetic excitation in La1.5Ca0.5CoO4

K. Horigane; K. Yamada; H. Hiraka; J. Akimitsu

doi:10.1016/j.jmmm.2006.10.530

Magnetic excitation in La_1.5Ca_0.5CoO₄

K. Horigane, K. Yamada, H. Hiraka, J. Akimitsu

Research output: Contribution to journal › Article

6 Citations (Scopus)

Abstract

We examined checkerboard charge and spin order in La_1.5Ca_0.5CoO₄ by elastic and inelastic neutron scattering. We discovered the sharp magnetic peaks with l=half-integer and broad magnetic peaks with l=integer in (0.5, 0, l). The origin of magnetic scattering can be explained by the minority and majority stacking arrangement of Co²⁺/Co³⁺ spins along the c-axis since the same magnetic reflections arise from the two stacking vectors in La_0.5Sr_1.5MnO₄. Spin-wave dispersion at majority stacking is seen up to 16 meV, in contrast to 50 meV in La_1.5Sr_0.5NiO₄. This indicates a much weaker exchange interaction in the cobaltates than in nickelates. The dispersion at majority stacking has almost a same one with that of minority stacking.

Original language	English
Pages (from-to)	774-776
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.530
Publication status	Published - Mar 1 2007
Externally published	Yes

Keywords

Checkerboard charge order
Cobaltate
Magnetic excitation
Majority and minority stacking

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Horigane, K., Yamada, K., Hiraka, H., & Akimitsu, J. (2007). Magnetic excitation in La_1.5Ca_0.5CoO₄. Journal of Magnetism and Magnetic Materials, 310(2 SUPPL. PART 1), 774-776. https://doi.org/10.1016/j.jmmm.2006.10.530

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abstract = "We examined checkerboard charge and spin order in La1.5Ca0.5CoO4 by elastic and inelastic neutron scattering. We discovered the sharp magnetic peaks with l=half-integer and broad magnetic peaks with l=integer in (0.5, 0, l). The origin of magnetic scattering can be explained by the minority and majority stacking arrangement of Co2+/Co3+ spins along the c-axis since the same magnetic reflections arise from the two stacking vectors in La0.5Sr1.5MnO4. Spin-wave dispersion at majority stacking is seen up to 16 meV, in contrast to 50 meV in La1.5Sr0.5NiO4. This indicates a much weaker exchange interaction in the cobaltates than in nickelates. The dispersion at majority stacking has almost a same one with that of minority stacking.",

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author = "K. Horigane and K. Yamada and H. Hiraka and J. Akimitsu",

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T1 - Magnetic excitation in La1.5Ca0.5CoO4

AU - Horigane, K.

AU - Yamada, K.

AU - Hiraka, H.

AU - Akimitsu, J.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - We examined checkerboard charge and spin order in La1.5Ca0.5CoO4 by elastic and inelastic neutron scattering. We discovered the sharp magnetic peaks with l=half-integer and broad magnetic peaks with l=integer in (0.5, 0, l). The origin of magnetic scattering can be explained by the minority and majority stacking arrangement of Co2+/Co3+ spins along the c-axis since the same magnetic reflections arise from the two stacking vectors in La0.5Sr1.5MnO4. Spin-wave dispersion at majority stacking is seen up to 16 meV, in contrast to 50 meV in La1.5Sr0.5NiO4. This indicates a much weaker exchange interaction in the cobaltates than in nickelates. The dispersion at majority stacking has almost a same one with that of minority stacking.

AB - We examined checkerboard charge and spin order in La1.5Ca0.5CoO4 by elastic and inelastic neutron scattering. We discovered the sharp magnetic peaks with l=half-integer and broad magnetic peaks with l=integer in (0.5, 0, l). The origin of magnetic scattering can be explained by the minority and majority stacking arrangement of Co2+/Co3+ spins along the c-axis since the same magnetic reflections arise from the two stacking vectors in La0.5Sr1.5MnO4. Spin-wave dispersion at majority stacking is seen up to 16 meV, in contrast to 50 meV in La1.5Sr0.5NiO4. This indicates a much weaker exchange interaction in the cobaltates than in nickelates. The dispersion at majority stacking has almost a same one with that of minority stacking.

KW - Checkerboard charge order

KW - Cobaltate

KW - Magnetic excitation

KW - Majority and minority stacking

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