Electron paramagnetic resonance study of nanostructured graphite

被引：54

作者：

Kausteklis, Jonas ^{[1
]}

Cevc, Pavel ^{[2
]}

Arcon, Denis ^{[2
,3
]}

Nasi, Lucia ^{[4
]}

Pontiroli, Daniele ^{[5
]}

Mazzani, Marcello ^{[5
]}

Ricco, Mauro ^{[5
]}

机构：

[1] Vilnius Univ, Fac Phys, LT-10222 Vilnius, Lithuania

[2] Jozef Stefan Inst, Ljubljana 1000, Slovenia

[3] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia

[4] CNR, Ist Mat Elettron Magnetismo, I-43124 Parma, Italy

[5] Univ Parma, Dept Phys, I-43124 Parma, Italy

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 12期

基金：

瑞士国家科学基金会;

关键词：

AMORPHOUS HYDROGENATED CARBON; SPIN-RESONANCE; GRAPHENE; DEFECTS; FILMS; C-13;

D O I：

10.1103/PhysRevB.84.125406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on a systematic temperature-dependent x-band electron paramagnetic resonance (EPR) study of nanosized graphite particles prepared by ball milling. In as-prepared samples a very intense and sharp EPR resonance at g = 2.0035 has been measured. The EPR line width shows a Korringa-like linear temperature dependence arising due to the coexistence and strong exchange coupling of itinerant and localized edge states. With a prolonged aging in inert atmosphere, changes in the EPR signal suggest gradual structural reconstruction where the localized edge states dominate the EPR signal. In this case the EPR spin susceptibility shows a maximum at approximate to 23 K indicating the development of antiferromagnetic correlations as expected for the graphene lattice with a bipartite symmetry.

引用

页数：5

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