Charge density waves in nanocrystalline thin films of blue bronze K0.3MoO3
| Autor: | Carmen Ristoscu, Damir Starešinić, Hanjo Schäfer, Jure Demsar, Ion N. Mihailescu, Maja Đekić, I. Bogdanović Radović, Galja Pletikapić, Damir Dominko, T. Huber, Zdravko Siketić, Gabriel Socol, Vesna Svetličić, H. Samic, Katica Biljaković, Krešimir Salamon, A. Tomeljak, J. Marcus |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Condensed matter physics Transition temperature Charge density Crystal growth Condensed Matter Physics Electronic Optical and Magnetic Materials Pulsed laser deposition thin films charge density waves blue bronze Change density waves Femtosecond time-resolved Nanoparticles Spectroscopy Thin film Femtosecond Electrical and Electronic Engineering Charge density wave |
| Popis: | Thin granular films of charge density wave (CDW) system K0.3MoO3 were prepared by pulsed laser deposition and investigated by various standard characterization methods such as GI-XRD, electric transport, TOF-ERDA, AFM and UV–visible spectroscopy. While all these methods indicate that the thin films consist of nanometer grains of K0.3MoO3, it is only the non-destructive femtosecond time-resolved spectroscopy (fsTRS) that demonstrates the charge density wave nature of the ground state and therefore proves directly the presence of K0.3MoO3. Furthermore, the comparison of the fsTRS data obtained in thin films and in single crystals shows the reduction of the charge density wave transition temperature and of the photoinduced signal strength in granular thin films with respect to single crystals, which is attributed to the granularity and crystal growth morphology. Our results establish fsTRS technique as the essential tool for the detection and characterization of complex ground states in nano-sized systems. |
| Databáze: | OpenAIRE |
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