Field-induced multiple metal-insulator crossovers of correlated Dirac electrons of perovskite CaIrO3
Field-induced multiple metal-insulator crossovers of correlated Dirac electrons of perovskite CaIrO3
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DOI：
10.1038/s41535-021-00418-2
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发表时间：
2021-08
影响因子：
5.7
通讯作者：
R. Yamada;J. Fujioka;M. Kawamura;S. Sakai;M. Hirayama;R. Arita;T. Okawa;D. Hashizume;T. Sato;F. Kagawa;R. Kurihara;M. Tokunaga;Y. Tokura
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作者：
R. Yamada;J. Fujioka;M. Kawamura;S. Sakai;M. Hirayama;R. Arita;T. Okawa;D. Hashizume;T. Sato;F. Kagawa;R. Kurihara;M. Tokunaga;Y. Tokura
电子相关与相对论性电子拓扑之间的相互作用可能会导致量子材料和涌现函数研究的一个引人入胜的阶段。各种可被外界刺激调节的集体电子有序/液体的出现是相关电子系统的一个显著特征，但在具有高迁移率相对论电子的拓扑半金属中很少实现。在这里，我们报道了钙钛矿cairo3中的相关狄拉克电子在量子极限下表现出非常规的场致连续金属-绝缘体-金属交叉，并伴有巨磁电阻（MR）， MR比为3500% （18 T和1.4 K）。结合数值计算，我们提出绝缘态起源于电子相关引起的电荷/自旋密度波等集体电子有序，而在更高的场下，由于场诱导的化学势的降低而转变为准一维金属，突出了相关狄拉克电子的高度场可调谐特性。
The interplay between electron correlation and topology of relativistic electrons may lead to a fascinating stage of the research on quantum materials and emergent functions. The emergence of various collective electronic orderings/liquids, which are tunable by external stimuli, is a remarkable feature of correlated electron systems, but has rarely been realized in the topological semimetals with high-mobility relativistic electrons. Here, we report that the correlated Dirac electrons in perovskite CaIrO3show unconventional field-induced successive metal–insulator–metal crossovers in the quantum limit accompanying a giant magnetoresistance (MR) with MR ratio of 3500 % (18 T and 1.4 K). In conjunction with the numerical calculation, we propose that the insulating state originates from the collective electronic ordering such as charge/spin density wave promoted by electron correlation, whereas it turns into the quasi-one-dimensional metal at higher fields due to the field-induced reduction of chemical potential, highlighting the highly field-tunable character of correlated Dirac electrons.