Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

doi:10.1088/1674-1056/ad3060

中国物理B ›› 2024, Vol. 33 ›› Issue (6): 67101-067101.doi: 10.1088/1674-1056/ad3060

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

Li-Bo Zhang(张黎博)^1,2, Qing-Xin Dong(董庆新)^1,2, Jian-Li Bai(白建利)^1,2, Qiao-Yu Liu(刘乔宇)^1,2, Jing-Wen Cheng(程靖雯)^1,2, Cun-Dong Li(李存东)^1,2, Pin-Yu Liu(刘品宇)^1,2, Ying-Rui Sun(孙英睿)^1,2, Yu Huang(黄宇)^1,2, Zhi-An Ren(任治安)^1,2, and Gen-Fu Chen(陈根富)^1,2,3,†

1 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2024-02-22 修回日期:2024-03-04 接受日期:2024-03-06 出版日期:2024-06-18 发布日期:2024-06-18
通讯作者: Gen-Fu Chen E-mail:gfchen@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12274440), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB33010100), the Fund from the Ministry of Science and Technology of China (Grant No. 2022YFA1403903), and the Fund of the Synergetic Extreme Condition User Facility (SECUF).

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

1 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2024-02-22 Revised:2024-03-04 Accepted:2024-03-06 Online:2024-06-18 Published:2024-06-18
Contact: Gen-Fu Chen E-mail:gfchen@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12274440), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB33010100), the Fund from the Ministry of Science and Technology of China (Grant No. 2022YFA1403903), and the Fund of the Synergetic Extreme Condition User Facility (SECUF).

摘要/Abstract

摘要： We synthesize high-quality single crystal of CeGaSi by a Ga self-flux method and investigate its physical properties through magnetic susceptibility, specific heat and electrical resistivity measurements as well as high pressure effect. Magnetic measurements reveal that an antiferromagnetic order develops below $T_{\rm m} \sim 10.4 $K with magnetic moments orientated in the \textit{ab} plane. The enhanced electronic specific heat coefficient and the negative logarithmic slope in the resistivity of CeGaSi indicate that the title compound belongs to the family of Kondo system with heavy fermion ground states. The max magnetic entropy change $-\Delta S_{\mathrm{M}}^{\mathrm{\max}}$ ($\mu_{0}H\bot c$, $\mu_0 H = 7$T) around $T_{\rm m}$ is found to reach up to 11.85J$\cdot$kg$^{-1}$$\cdot$K$^{-1}$. Remarkably, both the antiferromagnetic transition temperature and $-\ln T$ behavior increase monotonically with pressure applied to 20kbar (1bar$=$10$^5$Pa), indicating that much higher pressure will be needed to reach its quantum critical point.

关键词: heavy fermion, antiferromagnetic order, magnetocaloric effect

Abstract: We synthesize high-quality single crystal of CeGaSi by a Ga self-flux method and investigate its physical properties through magnetic susceptibility, specific heat and electrical resistivity measurements as well as high pressure effect. Magnetic measurements reveal that an antiferromagnetic order develops below $T_{\rm m} \sim 10.4 $K with magnetic moments orientated in the \textit{ab} plane. The enhanced electronic specific heat coefficient and the negative logarithmic slope in the resistivity of CeGaSi indicate that the title compound belongs to the family of Kondo system with heavy fermion ground states. The max magnetic entropy change $-\Delta S_{\mathrm{M}}^{\mathrm{\max}}$ ($\mu_{0}H\bot c$, $\mu_0 H = 7$T) around $T_{\rm m}$ is found to reach up to 11.85J$\cdot$kg$^{-1}$$\cdot$K$^{-1}$. Remarkably, both the antiferromagnetic transition temperature and $-\ln T$ behavior increase monotonically with pressure applied to 20kbar (1bar$=$10$^5$Pa), indicating that much higher pressure will be needed to reach its quantum critical point.

Key words: heavy fermion, antiferromagnetic order, magnetocaloric effect

中图分类号: (Strongly correlated electron systems; heavy fermions)

71.27.+a

75.30.Sg (Magnetocaloric effect, magnetic cooling) 75.30.Gw (Magnetic anisotropy) 71.20.Eh (Rare earth metals and alloys)

Li-Bo Zhang(张黎博), Qing-Xin Dong(董庆新), Jian-Li Bai(白建利), Qiao-Yu Liu(刘乔宇), Jing-Wen Cheng(程靖雯), Cun-Dong Li(李存东), Pin-Yu Liu(刘品宇), Ying-Rui Sun(孙英睿), Yu Huang(黄宇), Zhi-An Ren(任治安), and Gen-Fu Chen(陈根富). Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi[J]. 中国物理B, 2024, 33(6): 67101-067101.

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Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

Magnetism, heat capacity, magnetocaloric effect, and magneto-transport properties of heavy fermion antiferromagnet CeGaSi

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