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

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 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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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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