Charge localization in strongly correlated {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]I due to inherent disorder.

Iakutkina, O.; Majer, L. N.; Biesner, T.; Uykur, E.; Schleuter, J. A.; Dressel, M.

doi:10.1103/PhysRevB.104.205127

Charge localization in strongly correlated {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]I due to inherent disorder.

Journal Article · 23 November 2021 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.104.205127· OSTI ID:1841569

Iakutkina, O.; Majer, L. N.; Biesner, T.; Uykur, E.; Schleuter, J. A.; Dressel, M.

To understand the physical properties of the series of organic conductors kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]X with X = Cl, Br, and I, not only electronic correlations, but also the effect of disorder has to be taken into account. While for Cl- and Br-containing salts the influence of both parameters were investigated and a universal phase diagram was proposed, the position of kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]I is still not settled. Here we conducted transport, infrared, and dielectric measurements on single crystals of the title compound to clarify its electronic state at low temperatures. The correlation strength was determined as U/W approximate to 2.2; thus this salt is placed deeper in an insulating state compared to the two sister compounds. We found that inherent disorder leads to a Coulomb localized insulating state similar to the moderately x-ray-irradiated kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: Deutsche Forschungsgemeinschaft (DFG)

DOE Contract Number:: AC02-06CH11357;

OSTI ID:: 1841569

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 104; ISSN 2469-9950

Country of Publication:: United States

Language:: English

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