Naslov
Charge density waves in nanocrystalline thin films of blue bronze K0.3MoO3

Autori
Starešinić, Damir ; Dominko, Damir ; Salamon, Krešimir ; Biljaković, Katica ; Tomeljak, A. ; Schäfer, Hanjo J. ; Huber, Tim ; Demšar, Jure ; Socol, Gabriel ; Ristoscu, Carmen G. ; Mihǎilescu, Ion N. ; Siketić, Zdravko ; Bogdanović radović, Ivančica ; Pletikapić, Galja ; Svetličić, Vesna ; Ekić, M. ; Šamić, Hasnija ; Marcus, Jacques

Izvornik
Physica. B, Condensed matter (0921-4526) 407 (2012), 11; 1889-1893

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Change density waves ; Femtosecond time-resolved ; Nanoparticles ; Spectroscopy ; Thin film

Sažetak
Thin granular films of charge density wave (CDW) system K 0.3MoO 3 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 K 0.3MoO 3, 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 K 0.3MoO 3. 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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