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TT: Fachverband Tiefe Temperaturen
TT 12: Correlated Electrons: Frustrated Magnets - General 1
TT 12.10: Vortrag
Montag, 20. März 2017, 17:45–18:00, HSZ 03
Tuning the Effective Correlations in a Mott Insulator and Quantum Spin Lquid Compound — Miriam Sanz Alonso1, Andrej Pustogow1, Yohei Saito2, Atsushi Kawamoto2, and •Martin Dressel1 — 11. Phys. Inst. Univ. Stuttgart, Germany — 2Div. of Phys. Hokkaido Univ., Sapporo, Japan
The fictitious state of a quantum spin liquid was first realized in the dimerized Mott system κ-(BEDT-TTF)2Cu2(CN)3 about a decade ago. Here we tune the effective correlations U/W by a gradual increase of the bandwidth W in the substitutional series κ-(BEDT-TTF1−xBEDT-STFx)2Cu2(CN)3 with 0≤ x ≤ 1, where on one side of the molecule sulfur has been replaced by the larger selenium atoms. Comprehensive optical and transport investigations down to low temperatures evidence a metal-insulator transition as x exceeds 20% with no indications that disorder plays a crucial role. We analyze the dynamics of the correlated charge carriers and the shift of spectral weight; the results allow us to generate a unified phase diagram of this Mott system, that remains a spin liquid as it does not exhibit magnetic order down to lowest temperatures.