SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.10: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG3

Thermal-history-dependent electronic properties of κ-(BEDT-TTF)2Cu[N(CN)2]Br close to the Mott metal-insulator transition — •Florian Kollmannsberger1,2, Shamil Erkenov1,2, Natalia Kushch1, Toni Helm3, Werner Biberacher1, and Mark Kartsovnik11Walther-Meißner-Institut, 85748 Garching, Germany — 2Technische Universität München Fakultät Physik, 85748 Garching, Germany — 3Hochfeld-Magnetlabor Dresden, HZDR, 01328 Dresden, Germany

The partially deuterated organic charge-transfer salt κ-(BEDT-TTF)2Cu[N(CN)2]Br (shortly, κ-Br) can be tuned over the Mott-metal-insulator transition (MIT) by rapid cooling through the temperature interval around Tg ≃ 75 K where a glassy ordering of the BEDT-TTF ethylene endgroups occurs. It was suggested [1,2] that this tuning happens due to a change of the conduction bandwidth, an effect similar to that induced by hydrostatic pressure. We investigated the influence of the ethylene group ordering in purely hydrogenated κ-Br. To this end, we have studied the resistance as a function of temperature and magnetic field for samples cooled through the glass transition at different rates. In particular, we have studied the variation in the behavior of magnetoresistance quantum oscillations. This allows us to trace the change in the Hubbard model parameter U/t extracted from the renormalized effective cyclotron mass.

[1] B. Hartmann et al., Phys. Rev. B 90, 195150(2014).
[ 2 ] D. Guterding et al., Phys. Rev. B 92, 081109(R) (2015).

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