1. Field-induced multiple metal-insulator crossovers of correlated Dirac electrons of perovskite CaIrO$_3$
- Author
-
Yamada, R., Fujioka, J., Kawamura, M., Sakai, S., Hirayama, M., Arita, R., Okawa, T., Hashizume, D., Sato, T., Kagawa, F., Kurihara, R., Tokunaga, M., and Tokura, Y.
- Subjects
Condensed Matter - Strongly Correlated Electrons - Abstract
The interplay between electron correlation and topology of relativistic electrons may lead to a new 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 with the Mott criticality in perovskite CaIrO$_3$ show unconventional field-induced successive metal-insulator-metal crossovers in the quantum limit accompanying a giant magnetoresistance (MR) with MR ratio of 3,500 % (18 T and 1.4 K). The analysis shows 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-sensitive character of correlated Dirac electrons., Comment: 7 pages, 4 figures
- Published
- 2021
- Full Text
- View/download PDF