Magnetic phase diagrams and lattice structure of Nd1/2Ca 1/2(Mn1-yMy)O3 (M = Ru, Cr and Sc)

Sheng Xu; Yutaka Moritomo; Akihiko Machida; Kenji Ohoyama; Arao Nakamura

doi:10.1143/JPSJ.72.922

Magnetic phase diagrams and lattice structure of Nd_1/2Ca _1/2(Mn_1-yM_y)O₃ (M = Ru, Cr and Sc)

Sheng Xu, Yutaka Moritomo, Akihiko Machida, Kenji Ohoyama, Arao Nakamura

Institute for Materials Research (IMR)

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

8 Citations (Scopus)

Abstract

We have derived the magnetic phase diagram for Nd_1/2Ca _1/2(Mn_1-yM_y)O₃ (M = Ru, Cr and Sc) based on the neutron powder diffraction measurements. We found that the Ru- and Cr-doping induces an antiferromagnetic-to-ferromagnetic transition at y = 0.01-0.02, while the Sc-doping does not induce the transition up to y = 0.10. We have found significant dopant dependent effects on the distortion of the MnO₆ octahedra in the heavily-doped region of the long-c phase: the MnO₆ shape approached to the 2-long/4-short type with Ru-doping, while it does to the 4-long/2-short type with Sc-doping. Absence of the ferromagnetic phase in the Sc-doped system can be ascribed to (1) a strong charge-ordering instability due to the 4-long/2-short type distortion of the MnO₆ octahedra and (2) the reduced effective one-electron bandwidth due to the Sc³⁺ (d⁰) impurities.

Original language	English
Pages (from-to)	922-929
Number of pages	8
Journal	journal of the physical society of japan
Volume	72
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.72.922
Publication status	Published - 2003 Apr 1

Keywords

Neutron powder diffraction
Perovskite manganites
Rietveld structural analysis

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.72.922

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title = "Magnetic phase diagrams and lattice structure of Nd1/2Ca 1/2(Mn1-yMy)O3 (M = Ru, Cr and Sc)",

abstract = "We have derived the magnetic phase diagram for Nd1/2Ca 1/2(Mn1-yMy)O3 (M = Ru, Cr and Sc) based on the neutron powder diffraction measurements. We found that the Ru- and Cr-doping induces an antiferromagnetic-to-ferromagnetic transition at y = 0.01-0.02, while the Sc-doping does not induce the transition up to y = 0.10. We have found significant dopant dependent effects on the distortion of the MnO6 octahedra in the heavily-doped region of the long-c phase: the MnO6 shape approached to the 2-long/4-short type with Ru-doping, while it does to the 4-long/2-short type with Sc-doping. Absence of the ferromagnetic phase in the Sc-doped system can be ascribed to (1) a strong charge-ordering instability due to the 4-long/2-short type distortion of the MnO6 octahedra and (2) the reduced effective one-electron bandwidth due to the Sc3+ (d0) impurities.",

keywords = "Neutron powder diffraction, Perovskite manganites, Rietveld structural analysis",

author = "Sheng Xu and Yutaka Moritomo and Akihiko Machida and Kenji Ohoyama and Arao Nakamura",

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T1 - Magnetic phase diagrams and lattice structure of Nd1/2Ca 1/2(Mn1-yMy)O3 (M = Ru, Cr and Sc)

AU - Xu, Sheng

AU - Moritomo, Yutaka

AU - Machida, Akihiko

AU - Ohoyama, Kenji

AU - Nakamura, Arao

PY - 2003/4/1

Y1 - 2003/4/1

N2 - We have derived the magnetic phase diagram for Nd1/2Ca 1/2(Mn1-yMy)O3 (M = Ru, Cr and Sc) based on the neutron powder diffraction measurements. We found that the Ru- and Cr-doping induces an antiferromagnetic-to-ferromagnetic transition at y = 0.01-0.02, while the Sc-doping does not induce the transition up to y = 0.10. We have found significant dopant dependent effects on the distortion of the MnO6 octahedra in the heavily-doped region of the long-c phase: the MnO6 shape approached to the 2-long/4-short type with Ru-doping, while it does to the 4-long/2-short type with Sc-doping. Absence of the ferromagnetic phase in the Sc-doped system can be ascribed to (1) a strong charge-ordering instability due to the 4-long/2-short type distortion of the MnO6 octahedra and (2) the reduced effective one-electron bandwidth due to the Sc3+ (d0) impurities.

AB - We have derived the magnetic phase diagram for Nd1/2Ca 1/2(Mn1-yMy)O3 (M = Ru, Cr and Sc) based on the neutron powder diffraction measurements. We found that the Ru- and Cr-doping induces an antiferromagnetic-to-ferromagnetic transition at y = 0.01-0.02, while the Sc-doping does not induce the transition up to y = 0.10. We have found significant dopant dependent effects on the distortion of the MnO6 octahedra in the heavily-doped region of the long-c phase: the MnO6 shape approached to the 2-long/4-short type with Ru-doping, while it does to the 4-long/2-short type with Sc-doping. Absence of the ferromagnetic phase in the Sc-doped system can be ascribed to (1) a strong charge-ordering instability due to the 4-long/2-short type distortion of the MnO6 octahedra and (2) the reduced effective one-electron bandwidth due to the Sc3+ (d0) impurities.

KW - Neutron powder diffraction

KW - Perovskite manganites

KW - Rietveld structural analysis

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