Quantum critical behavior of the hyperkagome magnet MnCoSi

ハイパーカゴメ格子磁性体MnCoSiの量子臨界的振る舞い

山内宏樹 ; Sari, D. P.*; 安井幸夫*; 坂倉輝俊*; 木村宏之*; 中尾朗子*; 大原高志 ; 本田孝志*; 樹神克明 ; 井川直樹 ; 池田一貴*; 飯田一樹*; 植田大地*; 横尾哲也*; Frontzek, M. D.*; Chi, S.*; Fernandez-Baca, J. A.*; 小嶋健児*; Arseneau, D.*; Morris, G.*; Hitti, B.*; Cai, Y.*; Berlie, A.*; 渡邊功雄*; Hsu, P.-T.*; Chen, Y.-S.*; Lee, M. K.*; Hall, A. E.*; Balakrishnan, G.*; Chang, L.-J.*; 社本真一

Yamauchi, Hiroki; Sari, D. P.*; Yasui, Yukio*; Sakakura, Terutoshi*; Kimura, Hiroyuki*; Nakao, Akiko*; Ohara, Takashi; Honda, Takashi*; Kodama, Katsuaki; Igawa, Naoki; Ikeda, Kazutaka*; Iida, Kazuki*; Ueta, Daichi*; Yokoo, Tetsuya*; Frontzek, M. D.*; Chi, S.*; Fernandez-Baca, J. A.*; Kojima, Kenji M*; Arseneau, D.*; Morris, G.*; Hitti, B.*; Cai, Y.*; Berlie, A.*; Watanabe, Isao*; Hsu, P.-T.*; Chen, Y.-S.*; Lee, M. K.*; Hall, A. E.*; Balakrishnan, G.*; Chang, L.-J.*; Shamoto, Shinichi

-Mn-type family alloys Mn have three-dimensional antiferromagnetic (AFM) corner-shared triangular network. The antiferromagnet MnRhSi shows magnetic short-range order (SRO) over a wide temperature range of approximately 500 K above the Nel temperature $T_{rm N}$ = 190 K. MnCoSi has the smallest lattice parameter and the lowest $T_{rm N}$ in the family compounds. The quantum critical point (QCP) from AFM to the quantum paramagnetic state is expected near a cubic lattice parameter of 6.15 of MnCoSi is only 140 K, quantum critical behavior is observed in MnCoSi as the enhancement of the electronic specific heat coefficient . We study how the magnetic SRO appears in MnCoSi by using neutron scattering, SR, and physical property measurements. The experimental results show that the neutron scattering intensity of the magnetic SRO does not change much regardless of the suppressed magnetic moment in the long-range magnetic ordered state compared to those of MnRhSi. The initial asymmetry drop ratio of SR above $T_{rm N}$ becomes small, and the magnetic SRO temperature $T_{SRO}$ is suppressed to 240 K. The results suggest that the MnCoSi is close to the QCP in the Mn system.

発表言語	:	English
掲載資料名	:	Physical Review Research (Internet)
巻	:	6
号	:	1
ページ数	:	p.013144_1 - 013144_9
発行年月	:	2024/02
発表会議名	:
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開催国	:
キーワード	:	Neutron Scattering; Muon Spin Relaxation; Specific Heat; Magnetic Susceptibility; Magnetism; Magnetic Structure

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論文URL	:	https://doi.org/10.1103/PhysRevResearch.6.013144
研究データの公開先DOI	:	本成果にかかわる研究データのリンクです。
使用施設	:	J-PARC物質・生命科学実験施設 ;JRR-3M(研究炉3)
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受委託・共同研究相手機関	:	東北大学多元物質科学研究所; University of Warwick; National Cheng Kung University; Rutherford Appleton Laboratory; TRIUMF; Oak Ridge National Laboratory; 高エネルギー加速器研究機構; 総合科学研究機構; 明治大学; 芝浦工業大学

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抄録集掲載番号 : 52000426
論文投稿番号 : 27831

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