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TT: Fachverband Tiefe Temperaturen

TT 21: Correlated Electrons: Poster Session

TT 21.25: Poster

Mittwoch, 7. September 2022, 15:00–18:00, P1

Magnetic quantum oscillations in the molecular conductor κ- (BEDT-TTF)₂Cu[N(CN)₂]Cl near and away from the Mott transition — •Shamil Erkenov^1,2, Sebastian Oberbauer^1,2, Vladimir Zverev³, Werner Biberacher¹, Natalia Kushch¹, and Mark Kartsovnik¹ — ¹Walther-Meißner-Institut, Garching, Germany — ²Technische Universität München, Garching, Germany — ³Chernoglovka, Russia

Magnetic quantum oscillations have been extensively used for exploring correlated-electron materials near various correlation-driven instabilities of the normal metallic state. Applying this technique to the quasi-two-dimensional bandwidth-controlled Mott insulator κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl, we have recently disclosed several anomalies in the behavior of the effective mass and scattering rate, apparently inconsistent with theoretical predictions. For clarifying the role of the proximity to the Mott transition in these anomalies it is instructive to track their evolution in a broader range of the phase diagram, both very close to and far away from the metal-insulator phase boundary. To this end, we have measured quantum oscillations of magnetoresistance in the pressure interval 20 to 1000 MPa, which drives the system from the very edge of stability of the metallic phase to a “good metal” region of the phase diagram by means of the conducting bandwidth variation. We have also studied the possibility of changing the balance between the charge correlations and magnetic interactions governing the insulating instability by applying a strong magnetic field.