Charge and spin ordering in La2-xSrxCoO4 (0.4<x<0.6)

Kazumasa Horigane; Toru Uchida; Haruhiro Hiraka; Kazuyoshi Yamada; Jun Akimitsu

doi:10.1016/j.nima.2008.11.141

Charge and spin ordering in La_2-xSr_xCoO₄ (0.4<x<0.6)

Kazumasa Horigane, Toru Uchida, Haruhiro Hiraka, Kazuyoshi Yamada, Jun Akimitsu

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Neutron scattering experiments were performed on the single crystals of layered-perovskite cobaltate La_2-xSr_xCoO₄. For a commensurate value of x=0.5, magnetic reflections due to high-spin (HS) state of Co²⁺ are observed in (H, 0, L) plane. Further, in (H, H, L) plane, we found super-lattice reflections with wave vector q_m=(1/4, 1/4, 1). The latter magnetic peaks cannot be understood by the Co²⁺ spin configurations, indicating that these peaks are originated from Co³⁺ spin ordering. From the hole-doping dependence, short ranged charge and spin orderings were observed below x=0.5, while those of peaks were suppressed at x=0.6. Our results suggest that double exchange interaction between the HS state of Co²⁺ and the intermediate spin (IS) state of Co³⁺ mediate the IS state in this system.

Original language	English
Pages (from-to)	243-245
Number of pages	3
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	600
Issue number	1
DOIs	https://doi.org/10.1016/j.nima.2008.11.141
Publication status	Published - Feb 21 2009
Externally published	Yes

Keywords

Cobaltate
Hole-doping dependence
Intermediate spin state
Neutron diffraction

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Access to Document

10.1016/j.nima.2008.11.141

Cite this

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title = "Charge and spin ordering in La2-xSrxCoO4 (0.4<x<0.6)",

abstract = "Neutron scattering experiments were performed on the single crystals of layered-perovskite cobaltate La2-xSrxCoO4. For a commensurate value of x=0.5, magnetic reflections due to high-spin (HS) state of Co2+ are observed in (H, 0, L) plane. Further, in (H, H, L) plane, we found super-lattice reflections with wave vector qm=(1/4, 1/4, 1). The latter magnetic peaks cannot be understood by the Co2+ spin configurations, indicating that these peaks are originated from Co3+ spin ordering. From the hole-doping dependence, short ranged charge and spin orderings were observed below x=0.5, while those of peaks were suppressed at x=0.6. Our results suggest that double exchange interaction between the HS state of Co2+ and the intermediate spin (IS) state of Co3+ mediate the IS state in this system.",

keywords = "Cobaltate, Hole-doping dependence, Intermediate spin state, Neutron diffraction",

author = "Kazumasa Horigane and Toru Uchida and Haruhiro Hiraka and Kazuyoshi Yamada and Jun Akimitsu",

year = "2009",

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language = "English",

volume = "600",

pages = "243--245",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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T1 - Charge and spin ordering in La2-xSrxCoO4 (0.4<x<0.6)

AU - Horigane, Kazumasa

AU - Uchida, Toru

AU - Hiraka, Haruhiro

AU - Yamada, Kazuyoshi

AU - Akimitsu, Jun

PY - 2009/2/21

Y1 - 2009/2/21

N2 - Neutron scattering experiments were performed on the single crystals of layered-perovskite cobaltate La2-xSrxCoO4. For a commensurate value of x=0.5, magnetic reflections due to high-spin (HS) state of Co2+ are observed in (H, 0, L) plane. Further, in (H, H, L) plane, we found super-lattice reflections with wave vector qm=(1/4, 1/4, 1). The latter magnetic peaks cannot be understood by the Co2+ spin configurations, indicating that these peaks are originated from Co3+ spin ordering. From the hole-doping dependence, short ranged charge and spin orderings were observed below x=0.5, while those of peaks were suppressed at x=0.6. Our results suggest that double exchange interaction between the HS state of Co2+ and the intermediate spin (IS) state of Co3+ mediate the IS state in this system.

AB - Neutron scattering experiments were performed on the single crystals of layered-perovskite cobaltate La2-xSrxCoO4. For a commensurate value of x=0.5, magnetic reflections due to high-spin (HS) state of Co2+ are observed in (H, 0, L) plane. Further, in (H, H, L) plane, we found super-lattice reflections with wave vector qm=(1/4, 1/4, 1). The latter magnetic peaks cannot be understood by the Co2+ spin configurations, indicating that these peaks are originated from Co3+ spin ordering. From the hole-doping dependence, short ranged charge and spin orderings were observed below x=0.5, while those of peaks were suppressed at x=0.6. Our results suggest that double exchange interaction between the HS state of Co2+ and the intermediate spin (IS) state of Co3+ mediate the IS state in this system.

KW - Cobaltate

KW - Hole-doping dependence

KW - Intermediate spin state

KW - Neutron diffraction

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