Naslov
Pressure dependence of the metal-insulator transition in κ-(BEDT-TTF)2Hg(SCN)2Cl: optical and transport studies

Autori
Löhle, Anja ; Rose, Eva ; Singh, Sarika ; Beyer, Rebecca ; Tafra, Emil ; Ivek, Tomislav ; Zhilyaeva, E.I. ; Lyubovskaya, R.N. ; Dressel, Martin

Izvornik
Journal of physics. Condensed matter (0953-8984) 29 (2017); 055601-1

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

Ključne riječi
charge order; organic conductors; correlated electron systems; hydrostatic pressure; metal-insulator transition

Sažetak
The two-dimensional organic conductor κ-(BEDT-TTF)2-Hg(SCN)2Cl exhibits a pronounced metal-insulator transition at T_{; ; CO}; ; =30 K. From the splitting of the molecular vibrations, the phase transition can be unambiguously assigned to charge-ordering with 2\delta_\rho=0.2e . We have investigated the pressure evolution of this behavior by temperature-dependent electrical transport measurements and optical investigations applying hydrostatic pressure up to 12 kbar. The data reveal a mean-field like down-shift of T_{; ; CO}; ; (p) with a critical pressure of p_c=0.7 +- 0.1 kbar and a metallic state above the suppression of the charge-ordered state ; no traces of superconductivity could be identified down to T  =  1.5 K. As the charge order \delta_\rho sets in abruptly with decreasing temperature, its size remains unaffected by pressure. However, the fraction of charge imbalanced molecules decreases until it is completely absent above 1.6 kbar.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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