Magnetic impurity effect on charge and magnetic order in doped La 1.5Ca0.5CoO4

K. Horigane; H. Hiraka; K. Tomiyasu; K. Ohoyama; D. Louca; K. Yamada

doi:10.1088/1742-6596/340/1/012061

Magnetic impurity effect on charge and magnetic order in doped La _1.5Ca_0.5CoO₄

K. Horigane, H. Hiraka, K. Tomiyasu, K. Ohoyama, D. Louca, K. Yamada

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Conference article

Abstract

Neutron scattering experiments were performed on single crystals of magnetic impurity doped cobalt oxides La_1.5Ca_0.5CoO ₄ to characterize the charge and spin orders. We newly found contrasting impurity effects. Two types of magnetic peaks are observed at q=(0.5,0,L) with L=half-integer and integer in La_1.5Ca _0.5CoO₄, while magnetic peak at L=half-integer (integer) was only observed in Mn (Fe)-substituted sample. Although Mn and Fe impurities degrade charge and magnetic order, Cr impurity stabilizes the ordering at x=0.5. Based on the crystal structural analysis of Cr doped sample, we found that the excess oxygen and change of octahedron around Co³⁺ were realized in Cr doped sample.

Original language	English
Article number	012061
Journal	Journal of Physics: Conference Series
Volume	340
DOIs	https://doi.org/10.1088/1742-6596/340/1/012061
Publication status	Published - Jan 1 2012
Event	5th European Conference on Neutron Scattering, ECNS 2011 - Prague, Czech Republic Duration: Jul 17 2011 → Jul 21 2011

ASJC Scopus subject areas

Physics and Astronomy(all)

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Horigane, K., Hiraka, H., Tomiyasu, K., Ohoyama, K., Louca, D., & Yamada, K. (2012). Magnetic impurity effect on charge and magnetic order in doped La _1.5Ca_0.5CoO₄. Journal of Physics: Conference Series, 340, [012061]. https://doi.org/10.1088/1742-6596/340/1/012061

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title = "Magnetic impurity effect on charge and magnetic order in doped La 1.5Ca0.5CoO4",

abstract = "Neutron scattering experiments were performed on single crystals of magnetic impurity doped cobalt oxides La1.5Ca0.5CoO 4 to characterize the charge and spin orders. We newly found contrasting impurity effects. Two types of magnetic peaks are observed at q=(0.5,0,L) with L=half-integer and integer in La1.5Ca 0.5CoO4, while magnetic peak at L=half-integer (integer) was only observed in Mn (Fe)-substituted sample. Although Mn and Fe impurities degrade charge and magnetic order, Cr impurity stabilizes the ordering at x=0.5. Based on the crystal structural analysis of Cr doped sample, we found that the excess oxygen and change of octahedron around Co3+ were realized in Cr doped sample.",

author = "K. Horigane and H. Hiraka and K. Tomiyasu and K. Ohoyama and D. Louca and K. Yamada",

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doi = "10.1088/1742-6596/340/1/012061",

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journal = "Journal of Physics: Conference Series",

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T1 - Magnetic impurity effect on charge and magnetic order in doped La 1.5Ca0.5CoO4

AU - Horigane, K.

AU - Hiraka, H.

AU - Tomiyasu, K.

AU - Ohoyama, K.

AU - Louca, D.

AU - Yamada, K.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - Neutron scattering experiments were performed on single crystals of magnetic impurity doped cobalt oxides La1.5Ca0.5CoO 4 to characterize the charge and spin orders. We newly found contrasting impurity effects. Two types of magnetic peaks are observed at q=(0.5,0,L) with L=half-integer and integer in La1.5Ca 0.5CoO4, while magnetic peak at L=half-integer (integer) was only observed in Mn (Fe)-substituted sample. Although Mn and Fe impurities degrade charge and magnetic order, Cr impurity stabilizes the ordering at x=0.5. Based on the crystal structural analysis of Cr doped sample, we found that the excess oxygen and change of octahedron around Co3+ were realized in Cr doped sample.

AB - Neutron scattering experiments were performed on single crystals of magnetic impurity doped cobalt oxides La1.5Ca0.5CoO 4 to characterize the charge and spin orders. We newly found contrasting impurity effects. Two types of magnetic peaks are observed at q=(0.5,0,L) with L=half-integer and integer in La1.5Ca 0.5CoO4, while magnetic peak at L=half-integer (integer) was only observed in Mn (Fe)-substituted sample. Although Mn and Fe impurities degrade charge and magnetic order, Cr impurity stabilizes the ordering at x=0.5. Based on the crystal structural analysis of Cr doped sample, we found that the excess oxygen and change of octahedron around Co3+ were realized in Cr doped sample.

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