AC conductivity and correlation effects in nano-granular Pt/C

Abstract Nano-granular metals are materials that fall into the general class of granular electronic systems in which the interplay of electronic correlations, disorder and finite size effects can be studied. The charge transport in nano-granular metals is dominated by thermally-assisted, sequential...

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Autores principales:	Marc Hanefeld, Peter Gruszka, Michael Huth
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/39aebe0cb73142b293a2109056f7d207
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spelling	oai:doaj.org-article:39aebe0cb73142b293a2109056f7d2072021-12-02T16:31:52ZAC conductivity and correlation effects in nano-granular Pt/C10.1038/s41598-021-94575-w2045-2322https://doaj.org/article/39aebe0cb73142b293a2109056f7d2072021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94575-whttps://doaj.org/toc/2045-2322Abstract Nano-granular metals are materials that fall into the general class of granular electronic systems in which the interplay of electronic correlations, disorder and finite size effects can be studied. The charge transport in nano-granular metals is dominated by thermally-assisted, sequential and correlated tunneling over a temperature-dependent number of metallic grains. Here we study the frequency-dependent conductivity (AC conductivity) of nano-granular Platinum with Pt nano-grains embedded into amorphous carbon (C). We focus on the transport regime on the insulating side of the insulator metal transition reflected by a set of samples covering a range of tunnel-coupling strengths. In this transport regime polarization contributions to the AC conductivity are small and correlation effects in the transport of free charges are expected to be particularly pronounced. We find a universal behavior in the frequency dependence that can be traced back to the temperature-dependent zero-frequency conductivity (DC conductivity) of Pt/C within a simple lumped-circuit analysis. Our results are in contradistinction to previous work on nano-granular Pd/ $$\hbox {ZrO}_2$$ ZrO 2 in the very weak coupling regime where polarization contributions to the AC conductivity dominated. We describe possible future applications of nano-granular metals in proximity impedance spectroscopy of dielectric materials.Marc HanefeldPeter GruszkaMichael HuthNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marc Hanefeld Peter Gruszka Michael Huth AC conductivity and correlation effects in nano-granular Pt/C
description	Abstract Nano-granular metals are materials that fall into the general class of granular electronic systems in which the interplay of electronic correlations, disorder and finite size effects can be studied. The charge transport in nano-granular metals is dominated by thermally-assisted, sequential and correlated tunneling over a temperature-dependent number of metallic grains. Here we study the frequency-dependent conductivity (AC conductivity) of nano-granular Platinum with Pt nano-grains embedded into amorphous carbon (C). We focus on the transport regime on the insulating side of the insulator metal transition reflected by a set of samples covering a range of tunnel-coupling strengths. In this transport regime polarization contributions to the AC conductivity are small and correlation effects in the transport of free charges are expected to be particularly pronounced. We find a universal behavior in the frequency dependence that can be traced back to the temperature-dependent zero-frequency conductivity (DC conductivity) of Pt/C within a simple lumped-circuit analysis. Our results are in contradistinction to previous work on nano-granular Pd/ $$\hbox {ZrO}_2$$ ZrO 2 in the very weak coupling regime where polarization contributions to the AC conductivity dominated. We describe possible future applications of nano-granular metals in proximity impedance spectroscopy of dielectric materials.
format	article
author	Marc Hanefeld Peter Gruszka Michael Huth
author_facet	Marc Hanefeld Peter Gruszka Michael Huth
author_sort	Marc Hanefeld
title	AC conductivity and correlation effects in nano-granular Pt/C
title_short	AC conductivity and correlation effects in nano-granular Pt/C
title_full	AC conductivity and correlation effects in nano-granular Pt/C
title_fullStr	AC conductivity and correlation effects in nano-granular Pt/C
title_full_unstemmed	AC conductivity and correlation effects in nano-granular Pt/C
title_sort	ac conductivity and correlation effects in nano-granular pt/c
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/39aebe0cb73142b293a2109056f7d207
work_keys_str_mv	AT marchanefeld acconductivityandcorrelationeffectsinnanogranularptc AT petergruszka acconductivityandcorrelationeffectsinnanogranularptc AT michaelhuth acconductivityandcorrelationeffectsinnanogranularptc
_version_	1718383803566653440

AC conductivity and correlation effects in nano-granular Pt/C

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