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論文

Sommerfeld coefficient enhancement and magnetic short-range order in a hyperkagome 3$textit{d}$ system

社本 真一*; 安井 幸夫*; 吉澤 香奈子*; 野田 幸男*; 高橋 美和子*; 大貫 惇睦*; 芳賀 芳範; 石角 元志*; 山内 宏樹; Huang, T.-C.*; et al.

Physical Review B, 113(23), p.235126_1 - 235126_7, 2026/06

https://doi.org/10.1103/m5pw-ghz3
 被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)

$$beta$$-Mn shows a large Sommerfeld constant $$gamma$$ of 70 mJ,$$cdot$$,Mn$$^{-1}$$,$$cdot$$,K$$^{-2}$$, which is one of the largest values in 3$textit{d}$-electron systems. Although the origin has been attributed to the fluctuating magnetic moment, there are no material-dependent systematic studies in the 3$textit{d}$-electron systems except for doped $$beta$$-Mn. The ordered $$beta$$-Mn structure compounds Mn$$_3$$TX (T = Co, Rh, Ir; X = Si, Ge) also exhibit the $$gamma$$ enhancement. We have studied the $$gamma$$ enhancement in Mn$$_3$$TX system. The $$gamma$$ enhancement has been often accompanied with magnetic short-range order. The mechanism of the magnetic short-range order is discussed based on the phase diagrams of Mn$$_3$$TX system. The phase diagrams are categorized in two groups. One group of Mn$$_3$$CoSi and Mn$$_3$$RhSi exhibits the magnetic short-range order above the N$'{e}$el temperature, whereas the others do not. The two groups can be separated by the spin-orbit coupling value, regardless of the cubic lattice parameter.

論文

Quantum critical behavior of the hyperkagome magnet Mn$$_3$$CoSi

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; et al.

Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02

https://doi.org/10.1103/PhysRevResearch.6.013144

$$beta$$-Mn-type family alloys Mn$$_3$$$$TX$$ have three-dimensional antiferromagnetic (AFM) corner-shared triangular network. The antiferromagnet Mn$$_3$$RhSi shows magnetic short-range order (SRO) over a wide temperature range of approximately 500 K above the N$'{e}$el temperature $$T_{rm N}$$ = 190 K. Mn$$_3$$CoSi 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 $AA. Although $T_N$$ of Mn$$_3$$CoSi is only 140 K, quantum critical behavior is observed in Mn$$_3$$CoSi as the enhancement of the electronic specific heat coefficient $$gamma$$. We study how the magnetic SRO appears in Mn$$_3$$CoSi by using neutron scattering, $$mu$$SR, and physical property measurements. The experimental results show that the neutron scattering intensity of the magnetic SRO does not change much regardless of the suppressed magnetic moment in the long-range magnetic ordered state compared to those of Mn$$_3$$RhSi. The initial asymmetry drop ratio of $$mu$$SR above $$T_{rm N}$$ becomes small, and the magnetic SRO temperature $$T_{SRO}$$ is suppressed to 240 K. The results suggest that the Mn$$_3$$CoSi is close to the QCP in the Mn$$_3$$$$TX$$ system.

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