Localized and delocalized excitons:: Resonant inelastic X-ray scattering in La2-xSrxNiO4 and La2-xSrxCuO4

被引：50

作者：

Collart, E

Shukla, A

Rueff, JP

Leininger, P

Ishii, H

Jarrige, I

Cai, YQ

Cheong, SW

Dhalenne, G

机构：

[1] Univ Paris 06, Inst Mineral & Phys Milieux Condenses, F-75252 Paris 05, France

[2] Chim Phys Lab, F-75231 Paris 05, France

[3] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[4] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

[5] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[6] Univ Paris 11, Lab PhysicoChim Etat Solide, F-91405 Orsay, France

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.96.157004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dynamics of doped charge in an antiferromagnetic lattice is central to the description of the insulator-metal transition that occurs on doping the parent high T-c compounds. In this work we use high resolution resonant inelastic x-ray scattering to investigate the dynamics of the charge-transfer exciton by measuring its energy dispersion in two prototype compounds, La2CuO4 and La2NiO4. We show that this behavior is radically different in the cuprate with respect to a system known to exhibit strong polaronic behavior, namely, the nickelate: the exciton is mobile in the cuprate while it is well localized in the nickelate. Using a simple Wannier-Mott model we can estimate the total hole plus electron effective mass in the cuprate to be 3.5 +/- 0.3m(e) which would exclude strong localization in the undoped cuprate.

引用

页数：4

共 19 条

[11] Polaronic behavior of undoped high-Tc cuprate superconductors from angle-resolved photoemission spectra -: art. no. 227002 [J].