SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.9: Poster

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

Towards noise spectroscopy at the Mott critical endpoint — •Tim Thyzel¹, Harald Schubert¹, Michael Lang¹, Takahiko Sasaki², and Jens Müller¹ — ¹Institute of Physics, Goethe-Universität Frankfurt, Frankfurt (Main), Germany — ²Institute of Materials Research, Tohoku University, Sendai, Japan

Quasi-two-dimensional organic charge-transfer salts are ideal model systems for studying strongly correlated electrons due to their chemical variability, good physical tunability and rich phase diagrams.

Of special interest has been the family of Mott-Insulators κ-(ET)2Cu[N(CN)2]Z where Z is Br or Cl, which exhibit superconductivity and an insulator-to-metal transition in an easily accessible temperature-pressure window. In particular, we focus on the critical endpoint of the Mott transition, where a breakdown of Hooke’s law of elasticity has been observed [1], as well as indications of ergodicity breaking [2].

We employ resistance noise spectroscopy as a powerful method to detect slow dynamics in charge transport near the Mott endpoint, which we access in a cryogenic hydrostatic gas pressure setup. Using this technique, we search for a slowing-down of carrier dynamics, as well as the appearance of non-stationary fluctuations hinting at critical behaviour. Details on the experimental setup will be presented, as well as initial spectroscopy scans of the phase diagram.
[1] E. Gati, Sci. Adv. 2, e1601646 (2016)
[2] B. Hartmann, Phys. Rev. Lett. 114, 216403 (2015)