Strong-correlation induced high-mobility electrons in Dirac semimetal of perovskite oxide

被引：73

作者：

Fujioka, J. ^{[1
,2
,4
]}

Yamada, R. ^{[1
]}

Kawamura, M. ^{[3
]}

Sakai, S. ^{[3
]}

Hirayama, M. ^{[3
]}

Arita, R. ^{[1
,3
]}

Okawa, T. ^{[1
]}

Hashizume, D. ^{[3
]}

Hoshino, M. ^{[2
,3
]}

Tokura, Y. ^{[1
,3
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[3] RIKEN, CEMS, Wako, Saitama 3510198, Japan

[4] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki, Japan

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

日本学术振兴会;

关键词：

ELECTRICAL-PROPERTIES; TRANSPORT; PHASE;

D O I：

10.1038/s41467-018-08149-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Electrons in conventional metals become less mobile under the influence of electron correlation. Contrary to this empirical knowledge, we report here that electrons with the highest mobility ever found in known bulk oxide semiconductors emerge in the strong-correlation regime of the Dirac semimetal of perovskite CaIrO3. The transport measurements reveal that the high mobility exceeding 60,000 cm(2)V(-1)s(-1) originates from the proximity of the Fermi energy to the Dirac node (Delta E < 10 meV). The calculation based on the density functional theory and the dynamical mean field theory reveals that the energy difference becomes smaller as the system approaches the Mott transition, highlighting a crucial role of correlation effects cooperating with the spin-orbit coupling. The correlation-induced self-tuning of Dirac node enables the quantum limit at a modest magnetic field with a giant magnetoresistance, thus providing an ideal platform to study the novel phenomena of correlated Dirac electron.

引用

页数：6

共 41 条

[11] Correlated Dirac semimetallic state with unusual positive magnetoresistance in strain-free perovskite SrIrO3 [J].