Charge order and phonon renormalizations: Possible implications for cobaltates

被引：5

作者：

Bejas, M.

Greco, A.

Foussats, A.

机构：

[1] Univ Nacl Rosario, CONICET, Fac Ciencias Exactas Ingn & Agrimensura, RA-2000 Rosario, Santa Fe, Argentina

[2] Univ Nacl Rosario, CONICET, Inst Fis Rosario, RA-2000 Rosario, Santa Fe, Argentina

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.75.033101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Several experimental and theoretical studies in cobaltates suggest the proximity of the system to charge ordering (CO). We show, qualitatively, in the frame of a t-V model coupled to phonons, that optical phonon modes at the K and M points of the Brillouin zone, which involves only O ions displacement around a Co ion, are good candidates to display anomalies due to the CO proximity. If by increasing of H2O content the system is pushed closer to CO, the mentioned phonon modes should show softening and broadening.

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