MnTaO2N: Polar LiNbO3-type oxynitride with a helical spin order

Cédric Tassel; Yoshinori Kuno; Yoshihiro Goto; Takafumi Yamamoto; Craig M. Brown; James Hester; Koji Fujita; Masanobu Higashi; Ryu Abe; Katsuhisa Tanaka; Yoji Kobayashi; Hiroshi Kageyama

doi:10.1002/anie.201408483

MnTaO2N: Polar LiNbO3-type oxynitride with a helical spin order

Cédric Tassel, Yoshinori Kuno, Yoshihiro Goto, Takafumi Yamamoto, Craig M. Brown, James Hester, Koji Fujita, Masanobu Higashi, Ryu Abe, Katsuhisa Tanaka, Yoji Kobayashi, Hiroshi Kageyama

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Abstract

The synthesis, structure, and magnetic properties of a polar and magnetic oxynitride MnTaO2N are reported. High-pressure synthesis at 6 GPa and 1400°C allows for the stabilization of a high-density structure containing middle-to-late transition metals. Synchrotron X-ray and neutron diffraction studies revealed that MnTaO2N adopts the LiNbO3-type structure, with a random distribution of O2- and N3- anions. MnTaO2N with an "orbital-inactive" Mn2+ ion (d5; S = 5/2) exhibits a nontrivial helical spin order at 25 K with a propagation vector of [0,0,δ] (δ ≈ 0.3), which is different from the conventional G-type order observed in other orbital-inactive perovskite oxides and LiNbO3-type oxides. This result suggests the presence of strong frustration because of the heavily tilted MnO4N2 octahedral network combined with the mixed O2-/N3- species that results in a distribution of (super)-super-exchange interactions.

Original language	English (US)
Pages (from-to)	516-521
Number of pages	6
Journal	Angewandte Chemie - International Edition
Volume	54
Issue number	2
DOIs	https://doi.org/10.1002/anie.201408483
State	Published - Jan 7 2015
Externally published	Yes

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Generated from Scopus record by KAUST IRTS on 2022-09-13

ASJC Scopus subject areas

General Chemistry
Catalysis

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title = "MnTaO2N: Polar LiNbO3-type oxynitride with a helical spin order",

abstract = "The synthesis, structure, and magnetic properties of a polar and magnetic oxynitride MnTaO2N are reported. High-pressure synthesis at 6 GPa and 1400°C allows for the stabilization of a high-density structure containing middle-to-late transition metals. Synchrotron X-ray and neutron diffraction studies revealed that MnTaO2N adopts the LiNbO3-type structure, with a random distribution of O2- and N3- anions. MnTaO2N with an {"}orbital-inactive{"} Mn2+ ion (d5; S = 5/2) exhibits a nontrivial helical spin order at 25 K with a propagation vector of [0,0,δ] (δ ≈ 0.3), which is different from the conventional G-type order observed in other orbital-inactive perovskite oxides and LiNbO3-type oxides. This result suggests the presence of strong frustration because of the heavily tilted MnO4N2 octahedral network combined with the mixed O2-/N3- species that results in a distribution of (super)-super-exchange interactions.",

author = "C{\'e}dric Tassel and Yoshinori Kuno and Yoshihiro Goto and Takafumi Yamamoto and Brown, {Craig M.} and James Hester and Koji Fujita and Masanobu Higashi and Ryu Abe and Katsuhisa Tanaka and Yoji Kobayashi and Hiroshi Kageyama",

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T1 - MnTaO2N: Polar LiNbO3-type oxynitride with a helical spin order

AU - Tassel, Cédric

AU - Kuno, Yoshinori

AU - Goto, Yoshihiro

AU - Yamamoto, Takafumi

AU - Brown, Craig M.

AU - Hester, James

AU - Fujita, Koji

AU - Higashi, Masanobu

AU - Abe, Ryu

AU - Tanaka, Katsuhisa

AU - Kobayashi, Yoji

AU - Kageyama, Hiroshi

N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13

PY - 2015/1/7

Y1 - 2015/1/7

N2 - The synthesis, structure, and magnetic properties of a polar and magnetic oxynitride MnTaO2N are reported. High-pressure synthesis at 6 GPa and 1400°C allows for the stabilization of a high-density structure containing middle-to-late transition metals. Synchrotron X-ray and neutron diffraction studies revealed that MnTaO2N adopts the LiNbO3-type structure, with a random distribution of O2- and N3- anions. MnTaO2N with an "orbital-inactive" Mn2+ ion (d5; S = 5/2) exhibits a nontrivial helical spin order at 25 K with a propagation vector of [0,0,δ] (δ ≈ 0.3), which is different from the conventional G-type order observed in other orbital-inactive perovskite oxides and LiNbO3-type oxides. This result suggests the presence of strong frustration because of the heavily tilted MnO4N2 octahedral network combined with the mixed O2-/N3- species that results in a distribution of (super)-super-exchange interactions.

AB - The synthesis, structure, and magnetic properties of a polar and magnetic oxynitride MnTaO2N are reported. High-pressure synthesis at 6 GPa and 1400°C allows for the stabilization of a high-density structure containing middle-to-late transition metals. Synchrotron X-ray and neutron diffraction studies revealed that MnTaO2N adopts the LiNbO3-type structure, with a random distribution of O2- and N3- anions. MnTaO2N with an "orbital-inactive" Mn2+ ion (d5; S = 5/2) exhibits a nontrivial helical spin order at 25 K with a propagation vector of [0,0,δ] (δ ≈ 0.3), which is different from the conventional G-type order observed in other orbital-inactive perovskite oxides and LiNbO3-type oxides. This result suggests the presence of strong frustration because of the heavily tilted MnO4N2 octahedral network combined with the mixed O2-/N3- species that results in a distribution of (super)-super-exchange interactions.

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DO - 10.1002/anie.201408483

M3 - Article

SN - 1521-3773

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JO - Angewandte Chemie - International Edition

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MnTaO2N: Polar LiNbO3-type oxynitride with a helical spin order

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