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 oscill...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.展开更多
Unsaturated magnetoresistance （MR） has been reported in type-II Weyl semimetal WTe2, manifested as a perfect compensation of opposite carriers. We report linear MR （LMR） in WTe2 crystals, the onset of which was id...Unsaturated magnetoresistance （MR） has been reported in type-II Weyl semimetal WTe2, manifested as a perfect compensation of opposite carriers. We report linear MR （LMR） in WTe2 crystals, the onset of which was identified by constructing the MR mobility spectra for weak fields. The LMR further increased and became dominant for fields stronger than 20 T, while the parabolic MR gradually decayed. The LMR was also observed in high-pressure conditions.展开更多
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)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.2019kfy XMBZ071)the China Postdoctoral Science Foundation(Grant No.2018M630846)。
文摘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.
文摘Unsaturated magnetoresistance （MR） has been reported in type-II Weyl semimetal WTe2, manifested as a perfect compensation of opposite carriers. We report linear MR （LMR） in WTe2 crystals, the onset of which was identified by constructing the MR mobility spectra for weak fields. The LMR further increased and became dominant for fields stronger than 20 T, while the parabolic MR gradually decayed. The LMR was also observed in high-pressure conditions.
