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Gradual development of $$Gamma^{5g}$$ antiferromagnetic moment in the giant negative thermal expansion material Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N ($$xsim$$ 0.5)

巨大負熱膨張物質Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N($$xsim$$ 0.5)における$$Gamma^{5g}$$型反強磁性モーメントの緩やかな増大

樹神 克明   ; 飯久保 智*; 竹中 康司*; 滝川 仁*; 高木 英典*; 社本 真一  

Kodama, Katsuaki; Iikubo, Satoshi*; Takenaka, Koshi*; Takigawa, Masashi*; Takagi, Hidenori*; Shamoto, Shinichi

The anti-perovskite compound Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N with $$x sim 0.5$$ has a giant negative thermal expansion coefficient due to the magneto-volume effect near room temperature. Competition between the $$Gamma^{5g}$$ and $$Gamma^{4g}$$ antiferromagnetic structures around the magnetic ordering temperature could be the driving force for such a phenomenon. In order to examine this possibility, we performed neutron diffraction experiments on Mn$$_3$$Cu$$_{0.5}$$Ge$$_{0.5}$$N and $$^{14}$$N nuclear magnetic resonance (NMR) experiments on Mn$$_3$$Cu$$_{0.6}$$Ge$$_{0.4}$$N. As a reference material, we also investigated Mn$$_3$$NiN, whose spin structure is represented by a linear combination of the $$Gamma^{5g}$$ and $$Gamma^{4g}$$ antiferromagnetic components. We conclude that in Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N ($$x sim 0.5$$), the $$Gamma^{4g}$$ antiferromagnetic component is nearly absent and the competition between the $$Gamma^{5g}$$ and $$Gamma^{4g}$$ antiferromagnetic structures is irelevant to the giant negative thermal expansion coefficient. The $$Gamma^{5g}$$ antiferromagnetic ordered moment gradually develops with decreasing temperature. This provides a thorough justification for the analysis presented in the previous letter.

発表言語

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English

掲載資料名

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Physical Review B

巻

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81

号

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22

ページ数

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p.224419_1 - 224419_8

発行年月

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2010/06

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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no keyword

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/PhysRevB.81.224419

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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広報プレスリリース

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論文解説
(JAEA R&D Navigator)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：81.14

分野：Materials Science, Multidisciplinary

Altmetrics

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