Charge and Bonding in CuGeO3 Nanorods

被引：3

作者：

O'Neal, Kenneth R. ^{[1
]}

al-Wahish, Aural ^{[1
]}

Li, Zhao-Qian ^{[2
]}

Dhalenne, Guy ^{[3
]}

Revcolevschi, Alexandre ^{[3
]}

Chen, Xue-Tai ^{[4
]}

Musfeldt, Janice L. ^{[1
,5
]}

机构：

[1] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

[2] Chinese Acad Sci, Inst Appl Technol, Hefei Inst Phys Sci, Hefei 230031, Anhui, Peoples R China

[3] Univ Paris Saclay, ICMMO SP2M, UMR CNRS 8182, F-91405 Orsay, France

[4] Nanjing Univ, State Key Lab Coordinat Chem, Nanjing Natl Lab Microstruct, Sch Chem & Chem Engn, Nanjing 210023, Jiangsu, Peoples R China

[5] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

来源：

NANO LETTERS | 2018年 / 18卷 / 06期

关键词：

Spin-Peierls transition; magnetoelastic coupling; size effects; phonon confinement; nanorods; vibrational spectroscopy; SPIN-PEIERLS TRANSITION; FERROELECTRIC PHASE-TRANSITION; HEMATITE NANOPARTICLES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; LIGHT-SCATTERING; DIAGRAM; RAMAN; TEMPERATURE; PURE;

D O I：

10.1021/acs.nanolett.8b00407

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We combine infrared and Raman spectroscopies to investigate finite length scale effects in CuGeO3 nanorods. The infrared-active phonons display remarkably strong size dependence whereas the Raman-active features are, by comparison, nearly rigid. A splitting analysis of the Davydov pairs reveals complex changes in chemical bonding with rod length and temperature. Near the spin-Peierls transition, stronger intralayer bonding in the smallest rods indicates a more rigid lattice which helps to suppress the spin-Peierls transition. Taken together, these findings advance the understanding of size effects and collective phase transitions in low-dimensional oxides.

引用

页码：3428 / 3434

页数：7

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