alpha-YbAlB4的各向异性横向磁电阻率
Anisotropic transverse magnetoresistivity in alpha-YbAlB4
摘要：
测量了混合价化合物$α$ $_4$的横向磁电阻率.使用了两种配置，其中沿[110]方向施加电流，沿[-110]和$c$轴施加磁场。我们发现横向磁电阻率是高度各向异性的。在低于1 T的弱场中，这与先前零场电阻率测量所建议的$ab$平面中的较强$f$杂化一致。在高于3 T的较高磁场下，我们观察到沿$c$轴施加的磁场的负横向磁阻。在几个不同的磁场下测量的电阻率的温度依赖性表明，在$\sim 5.5$ T的特征磁场下，重费米子行为受到抑制。
英文摘要：
We measured the transverse magnetoresistivity of the mixed valence compound $α$-YbAlB$_4$. Two configurations were used where current was applied along [110] direction for both and magnetic field was applied along [-110] and $c$-axis. We found the transverse magnetoresistivity is highly anisotropic. In the weak field below 1 T, it is consistent with stronger $c$-$f$ hybridization in the $ab$ plane which was suggested from the previous zero field resistivity measurements. At the higher field above 3 T, we observed a negative transverse magnetoresistivity for the field applied along the $c$-axis. The temperature dependences of the resistivity measured at several different fields suggest the suppression of the heavy fermion behavior at the characteristic field of $\sim 5.5$ T.
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