Contactless conductivity of nanoparticles from electron magnetic resonance lineshape analysis

• Published in: Solid state communications Vol. 150; no. 33; pp. 1518 - 1520
• Main Authors: Padmalekha, K.G., Bhat, S.V.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-09-2010; Elsevier
• Subjects: A. Nanoparticles; Bulk sampling; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Conduction; Conductivity; Cross-disciplinary physics: materials science; rheology; D. Dysonian; E. Contactless conductivity; E. EMR; Electrical resistivity; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in multilayers, nanoscale materials and structures; Exact sciences and technology; Magnetic properties and materials; Magnetic resonance; Magnetotransport phenomena, materials for magnetotransport; Manganites; Materials science; Nanocrystalline materials; Nanoparticles; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Physics; Polyvinyl alcohols; Resistivity; Structure of solids and liquids; crystallography; E. Contactless conductivity; D. Dysonian; E. EMR; A. Nanoparticles; Electrical conductivity; Line shape; Measuring methods; XRD; Lattice parameters; Nanoparticles; Electron paramagnetic resonance; Manganites; Non contact measurement; Crystal structure
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2010.06.014

A contactless method to determine the electrical conductivity of nanoparticles is presented. It is based on the lineshape analysis of electron magnetic resonance signals which are ‘Dysonian’ for conducting samples of sizes larger than the skin depth. The method is validated by measurements on a bulk sample of La
0.67Sr
0.33MnO
3 where it gives values close to those obtained from direct measurement of conductivity and is then used to determine the conductivity of nanoparticles of La
0.67Sr
0.33MnO
3 dispersed in polyvinyl alcohol as a function of temperature.