COVALENCY-DRIVEN UNUSUAL METAL-INSULATOR-TRANSITION IN NICKELATES

被引：108

作者：

BARMAN, SR

CHAINANI, A

SARMA, DD

机构：

[1] Solid State and Structural Chemistry Unit, Indian Institute of Science

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.49.8475

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electronic structures of metallic LaNiO3 and insulating NdNiO3 are investigated using electron spectroscopies as well as band-structure and model-Hamiltonian calculations. It is shown that there is an increase in the transfer integral, t(pd) in LaNiO3 compared to NdNiO3 though U(dd) and DELTA are very similar. A phase diagram obtained with a multiband Hubbard model explains the metal-insulator transition as well as the anomalous resistivity of NdNiO3 under pressure while indicating various interesting possibilities near the metal-insulator phase line.

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页码：8475 / 8478

页数：4

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