Possible common ground for the metal-insulator phase transition in the rare-earth nickelates RNiO3 (R=Eu, Ho, Y) -: art. no. 153104

被引：18

作者：

de la Cruz, FP

Piamonteze, C

Massa, NE

Salva, H

Alonso, JA

Martínez-Lope, MJ

Casais, MT

机构：

[1] Natl Univ La Plata, Dept Quim, Ctr CEQUINOR, Lab Nacl Invest & Serv Espectroscopia Opt, RA-1900 La Plata, Argentina

[2] Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, Brazil

[3] Univ Estadual Campinas, Inst Fis, BR-13083970 Campinas, SP, Brazil

[4] Natl Univ La Plata, Dept Fis, RA-1900 La Plata, Argentina

[5] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[6] Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[7] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.66.153104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the infrared spectra of RNiO3 (R=Eu, Ho, Y). They provide evidence of phonon and insulating gap behavior and point to the monoclinic distortion at the metal-insulator (MI) transition as a feature for all RNiO3 (Rnot equalLa). We hypothesize that the intermediate paramagnetic phase (above T-N and below T-MI) in RNiO3 (R=Sm, Eu, Ho, Y) might be consequence of a self-doping effect, gradually triggering a phase segregation in electron-rich and electron-poor regions. This picture is concomitant to the temperature-dependent effect of octahedral tilting and distortion and self-trapped electrons in a polaronic medium.

引用

页码：1 / 4

页数：4

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