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Localized states in the Mott insulator κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl as probed by photoluminescence

We compare the photoluminescence spectra of the low-temperature Mott insulator \etcl (T_{MIT}=40 K) with spectra of metallic κ-(BEDT-TTF)_2Cu[N(CN)_2]Br, which is superconducting below T_c=11.8 K, in the temperature range between 300 and 20 K. In the Mott insulating state of κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl we observe a luminescence band at 1.95 eV due to the recombination of an exciton created by a HOMO-LUMO optical excitation. This luminescence is quenched both in the high-temperature bad metal state of κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl and in metallic κ-(BEDT-TTF)_2Cu[N(CN)_2]Br. The observation of the luminescence of an exciton provides evidence for the local character of excitations in the Mott insulating state.

preprint2013arXivOpen access
N. DrichkoR. HacklJ. A. Schlueter
cond-mat.str-el
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N. DrichkoR. HacklJ. A. Schlueter

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