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Semimetallic and charge-ordered α-(BEDT-TTF)2I3: On the role of disorder in dc transport and dielectric properties


Ivek, Tomislav; Čulo, Matija; Kuveždić, Marko; Tutiš, Eduard; Basletić, Mario; Mihaljević, Branimir; Tafra, Emil; Tomić, Silvia; Löhle, Anja; Dressel, Martin et al.
Semimetallic and charge-ordered α-(BEDT-TTF)2I3: On the role of disorder in dc transport and dielectric properties // Physical Review B - Condensed Matter and Materials Physics, 96 (2017), 075141, 9 doi:10.1103/PhysRevB.96.075141 (međunarodna recenzija, članak, znanstveni)


Naslov
Semimetallic and charge-ordered α-(BEDT-TTF)2I3: On the role of disorder in dc transport and dielectric properties

Autori
Ivek, Tomislav ; Čulo, Matija ; Kuveždić, Marko ; Tutiš, Eduard ; Basletić, Mario ; Mihaljević, Branimir ; Tafra, Emil ; Tomić, Silvia ; Löhle, Anja ; Dressel, Martin ; Schweitzer, Dieter ; Korin-Hamzić, Bojana

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 96 (2017); 075141, 9

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

Ključne riječi
Organic conductor, BEDT-TTF, charge order, semimetal, Hall effect, inter-pocket scattering, temperature-dependent gap, hopping conductivity, negative magnetoresistance, disorder, relaxor-like ferroelectric

Sažetak
α-(BEDT-TTF)2I3 is a prominent example of charge ordering among organic conductors. In this work, we explore the details of transport within the charge-ordered as well as semimetallic phase at ambient pressure. In the high-temperature semimetallic phase, the mobilities and concentrations of both electrons and holes conspire in such a way to create an almost temperature-independent conductivity as well as a low Hall effect. We explain these phenomena as a consequence of a predominantly interpocket scattering which equalizes mobilities of the two types of charge carriers. At low temperatures, within the insulating charge-ordered phase two channels of conduction can be discerned: a temperature-dependent activation, which follows the mean-field behavior, and a nearest-neighbor-hopping contribution. Together with negative magnetoresistance, the latter relies on the presence of disorder. The charge-ordered phase also features a prominent dielectric peak which bears a similarity to relaxor ferroelectrics. Its dispersion is determined by free-electron screening and pushed by disorder well below the transition temperature. The source of this disorder can be found in the anion layers which randomly perturb BEDT-TTF molecules through hydrogen bonds.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2013-11-1011 - Jako korelirani elektroni u slojnim organskim materijalima i manganitima: niskofrekventna pobuđenja i nelinearna dinamika (Silvia Tomić, )

Ustanove
Institut za fiziku, Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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