Probing the origin of extreme magnetoresistance in Pr/Sm mono-antimonides/bismuthides
Probing the origin of extreme magnetoresistance in Pr/Sm mono-antimonides/bismuthides
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探讨Pr/Sm单锑化物/铋化物极端磁阻的起源
DOI：
10.1103/physrevb.99.035158
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发表时间：
2019
影响因子：
3.7
通讯作者：
Liu Yang
中科院分区：
文献类型：
--
作者：
Wu Zhongzheng;Wu Fan;Li Peng;Guo Chunyu;Liu Yi;Sun Zhe;Cheng Cheng Maw;Chiang Tai Chang;Cao Chao;Yuan Huiqiu;Liu Yang
结合角分辨光电子能谱和磁输运测量，系统地研究了Pr/Sm单锑化物/铋化物（PrSb，SmSb，PrBi，SmBi）中极端磁电阻的可能来源.我们的光电子能谱测量结果表明，体带反转和表面状态是不存在的（本）在Pr/Sm锑化物（铋化物），这意味着拓扑表面状态是不可能发挥重要作用，所观察到的极端磁阻。结果表明，在10 ~ 150 K温度范围内，这些化合物的电子-空穴补偿都很好，体能带结构没有明显的温度依赖性。同时拟合的磁阻和霍尔系数表明，载流子迁移率显着增强，在低温下，这自然解释了极端的磁阻在高温下的抑制。因此，我们的结果表明，这些化合物中的极端磁电阻可以用具有良好电子-空穴补偿的双带模型很好地解释。最后，我们发现PrSb和SmSb在X点附近表现出高度线性的体带，并且靠近拓扑平凡相和非平凡相之间的过渡点，这可能与观察到的异常量子振荡有关。
Combining angle-resolved photoemission spectroscopy and magneto-transport measurements, we systematically investigated the possible origin of the extreme magnetoresistance in Pr/Sm mono-antimonides/bismuthides (PrSb, SmSb, PrBi, SmBi). Our photoemission measurements reveal that the bulk band inversion and surface states are absent (present) in Pr/Sm antimonides (bismuthides), implying that topological surface states are unlikely to play an important role for the observed extreme magnetoresistance. We found that the electron-hole compensation is well satisfied in all these compounds and the bulk band structure exhibits no obvious temperature dependence from 10 K up to 150 K. Simultaneous fittings of the magnetoresistance and Hall coefficient reveal that the carrier mobility is dramatically enhanced at low temperature, which naturally explains the suppression of extreme magnetoresistance at high temperatures. Our results therefore show that the extreme magnetoresistance in these compounds can be well accounted for by the two-band model with good electron-hole compensation. Finally, we found that both PrSb and SmSb exhibit highly linear bulk bands near the X point and lie close to the transition point between a topologically trivial and nontrivial phase, which might be relevant for the observed anomalous quantum oscillations.