Anisotropic Fermi Surfaces,Electrical Transport,and Two-Dimensional Fermi Liquid Behavior in Layered Ternary Boride MoAlB  

作　　者：Pan Nie Huakun Zuo Lingxiao Zhao Zengwei Zhu 聂盼;左华坤;赵凌霄;朱增伟(Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Chinese Physics Letters》2022年第5期63-70,共8页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12004123,51861135104,and 11574097);the National Key Research and Development Program of China(Grant No.2016YFA0401704);the Fundamental Research Funds for the Central Universities(Grant No.2019kfy XMBZ071);the China Postdoctoral Science Foundation(Grant No.2018M630846)。

摘　　要：We report a study of fermiology,electrical anisotropy,and Fermi liquid properties in the layered ternary boride MoAlB,which could be peeled into two-dimensional(2 D)metal borides(MBenes).By studying the quantum oscillations in comprehensive methods of magnetization,magnetothermoelectric power,and torque with the firstprinciple calculations,we reveal three types of bands in this system,including two 2 D-like electronic bands and one complex three-dimensional-like hole band.Meanwhile,a large out-of-plane electrical anisotropy(ρbb/ρaa~1100 andρbb/ρcc~500,at 2 K)was observed,which is similar to those of the typical anisotropic semimetals but lower than those of some semiconductors(up to 10^(5)).After calculating the Kadowaki-Woods ratio(KWR=A/γ^(2)),we observed that the ratio of the in-plane Aa,c/γ^(2)is closer to the universal trend,whereas the out-of-plane Ab/γ^(2)severely deviates from the universality.This demonstrates a 2 D Fermi liquid behavior.In addition,MoAlB cannot be unified using the modified KWR formula like other layered systems(Sr_(2)RuO_(4)and MoOCl_(2)).This unique feature necessitates further exploration of the Fermi liquid property of this layered molybdenum compound.

关 键 词：FERMI BANDS ANISOTROPY 

分 类 号：O469[理学—凝聚态物理]