Charge density waves in nanocrystalline thin films of blue bronze K_0.3MoO₃

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• 作者：D. Stareš ; inić ; ^a ; ^{damirs@ifs.hr} ; D. Dominko^a ; ^{ddominko@ifs.hr} ; K. Salamon^a ; ^{ksalamon@ifs.hr} ; K. Biljaković ; ^a ; ^{katica@ifs.hr} ; A. Tomeljak^b ; ^c ; ^{atomeljak@gmail.com} ; H. Schä ; fer^c ; ^{hanjo.schaefer@uni-konstanz.de} ; T. Huber^c ; ^{tim.huber@uni-konstanz.de} ; J. Demsar^b ; ^c ; ^{jure.demsar@uni-konstanz.de} ; G. Socol^d ; ^{gabriel.socol@inflpr.ro} ; C. Ristoscu^d ; ^{carmen.ristoscu@inflpr.ro} ; I.N. Mihailescu^d ; ^{ion.mihailescu@inflpr.ro} ; Z. Siketić ; ^e ; ^{zsiketic@irb.hr} ; I. Bogdanović ; Radović ; ^e ; ^{Ivancica.Bogdanovic-Radovic@irb.hr} ; G. Pletikapić ; ^e ; ^{gpletik@irb.hr} ; V. Svetlič ; ić ; ^e ; ^{svetlicic@irb.hr} ; M. Đ ; ekić ; ^f ; ^{majadeki@gmail.com} ; H. &#352 ; amić ; ^g ; ^{hsamic@etf.unsa.ba} ; J. Marcus^h ; ^{jacques.marcus@grenoble.cnrs.fr}
• 关键词：Change density waves ; Femtosecond time-resolved ; Spectroscopy ; Thin film ; Nanoparticles
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：1 June, 2012
• 卷：407
• 期：11
• 页码：1889-1893
• 文件大小：854 K

摘要

Thin granular films of charge density wave (CDW) system K_0.3MoO₃ 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 K_0.3MoO₃, 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 K_0.3MoO₃. 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.