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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.3: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Microscopic Dynamics during Charge-Glass Formation in θ-(BEDT-TTF)₂TlZn(SCN)₄ — •Tim Thyzel¹, Tatjana Thomas¹, Kenichiro Hashimoto², Takahiko Sasaki², and Jens Müller¹ — ¹Institute of Physics, Goethe-University Frankfurt, Frankfurt (Main), Germany — ²Institute for Materials Research, Tohoku University, Sendai, Japan

Organic charge-transfer salts allow for a systematic examination of strong electron-electron correlation in reduced dimensions. The θ-(ET)₂X salts, which consist of alternating layers of conducting organic molecules (ET)₂ and insulating anions X, exhibit charge ordering in the conducting layers below a characteristic temperature. However, the phase transition of the electronic system to this ordered state can be avoided by rapid cooling [1]. Then, a glass-like state emerges due to the geometric frustration of the conducting lattice, which acts against the formation of long-range order. We study the system θ-(ET)₂TlZn(SCN)₄, whose lattice is more anisotropic, and thus less frustrated, than that of other θ-phase compounds. Therefore, rather high cooling rates of at least 50 K/min are required to force a transition to the charge-glass state [2]. We achieve these cooling rates using a voltage pulse method recently shown [3] to be capable of rates in excess of 1000 K/min. Resistance fluctuation spectroscopy is then employed to gain insights into the deceleration of microscopic dynamics at the liquid-glass transition [4].

[1] Adv. Mater. 29, 1601979

[2] Science 357, 1381-1385

[3] Phys. Rev. B 90, 195150

[4] Crystals 8, 166