Quantum critical behavior of the hyperkagome magnet Mn3CoSi

Hiroki Yamauchi, Dita Puspita Sari, Yukio Yasui, Terutoshi Sakakura, Hiroyuki Kimura, Akiko Nakao, Takashi Ohhara, Takashi Honda, Katsuaki Kodama, Naoki Igawa, Kazutaka Ikeda, Kazuki Iida, Daichi Ueta, Tetsuya Yokoo, Matthias D. Frontzek, Songxue Chi, Jaime A. Fernandez-Baca, Kenji M. Kojima, Donald Arseneau, Gerald MorrisBassam Hitti, Yipeng Cai, Adam Berlie, Isao Watanabe, Pai Tse Hsu, Yu Sheng Chen, Min Kai Lee, Amelia Elisabeth Hall, Geetha Balakrishnan, Lieh Jeng Chang, Shin Ichi Shamoto

研究成果: Article同行評審

摘要

β-Mn-type family alloys Mn3TX (T=Co, Rh, and Ir; X=Si and Ge) have a three-dimensional antiferromagnetic (AF) corner-shared triangular network, i.e., the hyperkagome lattice. The antiferromagnet Mn3RhSi shows magnetic short-range order over a wide temperature range of approximately 500 K above the Néel temperature TN of 190 K. In this family of compounds, as the lattice parameter decreases, the long-range magnetic ordering temperature decreases. Mn3CoSi has the smallest lattice parameter and the lowest TN in the family. The quantum critical point (QCP) from AF to the quantum paramagnetic state is expected near a cubic lattice parameter of 6.15 Å. Although the Néel temperature of Mn3CoSi is only 140 K, the emergence of the quantum critical behavior in Mn3CoSi is discussed. We study how the magnetic short-range order appears in Mn3CoSi by using neutron scattering, μSR, and bulk characterization such as specific heat capacity. According to the results, the neutron scattering intensity of the magnetic short-range order in Mn3CoSi does not change much at low temperatures from that of Mn3RhSi, although the μSR short-range order temperature of Mn3CoSi is largely suppressed to 240 K from that of Mn3RhSi. Correspondingly, the volume fraction of the magnetic short-range order regions, as shown by the initial asymmetry drop ratio of μSR above TN, also becomes small. Instead, the electronic-specific heat coefficient γ of Mn3CoSi is the largest in this Mn3TSi system, possibly due to the low-energy spin fluctuation near the quantum critical point.

原文English
文章編號013144
期刊Physical Review Research
6
發行號1
DOIs
出版狀態Published - 2024 1月

All Science Journal Classification (ASJC) codes

  • 一般物理與天文學

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