Naslov
Cooperative Mercury Motion in the Ionic Conductor Cu2HgI4

Autori
Pelc, Damjan ; Marković, Igor ; Požek, Miroslav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Magnetic Resonance Conference (Euromar 2012) : Program book and abstracts ; 451TH / Hewage, Chandralal - Dublin : University College, 2012, 188-188

Skup
Magnetic Resonance Conference

Mjesto i datum
Dublin, Irska, 01.07.2012. - 05.07.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ionic conductor; NMR; nonlinear conductivity; cooperativity

Sažetak
In glass-forming materials particles increasingly move together as the glass transition is approached . Such cooperativity is also found in other arrested systems and seems to be intimately connected to the slow dynamics . Here we report on the observation of large-scale dynamic correlations in a distinctly non-glassy system – the conductive phase of the ionic conductor Cu2HgI4 [1] . Using carefully designed nuclear magnetic resonance experiments we prove that mercury ions are the main contributors to conduction (establishing Cu2HgI4 as the first known mercury conductor), and show that mercury diffusion is anomalous . Nonlinear conductivity measurements, used as a probe for dynamical heterogeinity, reveal a characteristic correlation timescale tau_corr . The same timescale is confirmed by stimulated echo NMR measurements, where the fraction of ions trapped after tau_corr can be directly measured . To explain the cooperativity we propose a simple model with two essential ingredients – disorder and existence of two kinds of particles, slow (copper) and fast (mercury). We compare the results with recent studies of arrested and glass-forming materials [2, 3], thus establishing an unexpected connection between seemingly different fields.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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