Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.41: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster E
Unveiling the optical behavior of a doped molecular quantum spin liquid candidate — Savita Priya1, Sudip Pal1, Christian Prange1, Hiromi Taniguchi2, and •Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Graduate School of Science and Engineering, Saitama University, Japan
Quantum spin liquid (QSL) materials, identified by antiferromagnetic spin arrangement in a triangular lattice, have attracted attention ever since it was theorized. Study of the experimentally challenging QSL state, described by absence of long-range magnetic order due to geometric frustration involves techniques such as thermodynamic methods and magnetic probes to elucidate the magnetic properties. Among molecular QSLs, the κ-phase BEDT-TTF salts are notably significant as their triangular lattice points consist of BEDT-TTF dimer, in contrast to the atomic arrangement in inorganic QSL candidates. Owing to the incommensurate interpenetrating sublattice structure, a quasi-two dimensional organic conductor, κ-(BEDT-TTF)4Hg2.89Br8 has gained attention as a doped QSL candidate. The unconventional stoichiometry results in 11complexity and plausible inhomogeneity. It is interesting to compare the electronic properties with the isostructural QSL candidate, κ-(BEDT-TTF)2Cu2(CN)3. Here we present the results of our detailed infrared investigations of the correlated electron system κ-(BEDT-TTF)4Hg2.89Br8 in a wide temperature and spectral range revealing insights into charge dynamics, vibrational properties, subtle temperature-induced changes in the electronic behavior and the anisotropic optical response.
Keywords: Organic conductor; correlated electrons; QSL candidate; infrared spectroscopy