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

作　　者：张黎博 董庆新 白建利 刘乔宇 程靖雯 李存东 刘品宇 孙英睿 黄宇 任治安 陈根富 Li-Bo Zhang;Qing-Xin Dong;Jian-Li Bai;Qiao-Yu Liu;Jing-Wen Cheng;Cun-Dong Li;Pin-Yu Liu;Ying-Rui Sun;Yu Huang;Zhi-An Ren;Gen-Fu Chen(Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第6期495-502,共8页中国物理B（英文版）

基　　金：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);the Fund of the Synergetic Extreme Condition User Facility (SECUF)。

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_(m)~10.4 K with magnetic moments orientated in the 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-ΔS_(M)^(max)(μ_(0)H⊥c,μ_(0)H=7 T) around T_(m) is found to reach up to 11.85 J·kg^(-1)·K^(-1).Remarkably,both the antiferromagnetic transition temperature and-ln T behavior increase monotonically with pressure applied to 20 kbar(1 bar=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 

分 类 号：O469[理学—凝聚态物理]