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Charge transport in thin layer Na.sub.x./sub.CoO.sub.2./sub. (x similar to 0.63) studied by terahertz spectroscopy
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SYSNO ASEP 0470137 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Charge transport in thin layer NaxCoO2 (x similar to 0.63) studied by terahertz spectroscopy Author(s) Němec, Hynek (FZU-D) RID, ORCID, SAI
Knížek, Karel (FZU-D) RID, ORCID
Jirák, Zdeněk (FZU-D) RID, ORCID, SAI
Hejtmánek, Jiří (FZU-D) RID, ORCID
Soroka, Miroslav (UACH-T) SAI, ORCID, RID
Buršík, Josef (UACH-T) RID, ORCID, SAINumber of authors 6 Article number 355601 Source Title Journal of Physics-Condensed Matter. - : Institute of Physics Publishing - ISSN 0953-8984
Roč. 28, č. 35 (2016), 1-6Number of pages 6 s. Language eng - English Country GB - United Kingdom Keywords cobaltates ; thermoelectrics ; NaxCoO2 ; terahertz spectroscopy Subject RIV BM - Solid Matter Physics ; Magnetism Subject RIV - cooperation Institute of Inorganic Chemistry - Inorganic Chemistry R&D Projects GA13-17538S GA ČR - Czech Science Foundation (CSF) GA13-03708S GA ČR - Czech Science Foundation (CSF) GA13-12386S GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 ; UACH-T - RVO:61388980 UT WOS 000380740000014 EID SCOPUS 84979520193 DOI 10.1088/0953-8984/28/35/355601 Annotation Charge transport in Na0.63CoO2 thin film deposited by a spin-coating method was investigated experimentally by time-domain terahertz spectroscopy and theoretically using Monte Carlo calculations of charge response in nano-structured materials. The dominating type of transport mechanism over the entire investigated range of temperatures (20-300 K) is a metallic-like conductivity of charges partly confined in constituting nano-sized grains. Due to the granular character of our thin film, the scattering time at low temperatures is limited by scattering on grain boundaries and the conductivity is strongly suppressed due to capture of a major fraction of charge carriers in deep traps. Nevertheless, our experimental setup and the applied model allowed us to distinguish the parameters related to the grain interior from those influenced by grain boundaries, and to conclude that the metallic type of conductivity is the intrinsic property relevant to single crystal materials. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2017
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