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 › peer-review

4 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 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

Access to Document

10.1016/j.jmmm.2006.10.530

Cite this

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title = "Magnetic excitation in La1.5Ca0.5CoO4",

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.",

keywords = "Checkerboard charge order, Cobaltate, Magnetic excitation, Majority and minority stacking",

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

note = "Funding Information: This work was partly supported by the 21st COE program, “High-Tech Research Center” Project for Private Universities: matching fund subsidy from MEXT (Ministry of Education, Culture, Sports, Science and Technology; 2002–2004) and a Grant-in-Aid for Scientific Research on Priority Area from the Ministry of Education, Culture, Sports, Science and Technology of Japan.",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.530",

language = "English",

volume = "310",

pages = "774--776",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "2 SUPPL. PART 1",

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

AU - Horigane, K.

AU - Yamada, K.

AU - Hiraka, H.

AU - Akimitsu, J.

N1 - Funding Information: This work was partly supported by the 21st COE program, “High-Tech Research Center” Project for Private Universities: matching fund subsidy from MEXT (Ministry of Education, Culture, Sports, Science and Technology; 2002–2004) and a Grant-in-Aid for Scientific Research on Priority Area from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

PY - 2007/3

Y1 - 2007/3

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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