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Dielectric Anomaly and Charge Fluctuations in the Non-Magnetic Dimer Mott Insulator λ-(BEDT-STF)2GaCl4

Authors :
Olga Iakutkina
Roland Rosslhuber
Atsushi Kawamoto
Martin Dressel
Source :
Crystals, Vol 11, Iss 9, p 1031 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

The dimer Mott insulator λ-(BEDT-STF)2GaCl4 undergoes no magnetic order down to the lowest temperatures, suggesting the formation of a novel quantum disordered state. Our frequency and temperature-dependent investigations of the dielectric response reveal a relaxor-like behavior below T≈100 K for all three axes, similar to other spin liquid candidates. Optical measurement of the charge-sensitive vibrational mode ν27(b1u) identifies a charge disproportionation Δρ≈0.04e on the dimer that exists up to room temperature and originates from inequivalent molecules in the weakly coupled dimers. The linewidth of the charge sensitive mode is broader than that of typical organic conductors, supporting the existence of a disordered electronic state.

Details

Language :
English
ISSN :
20734352
Volume :
11
Issue :
9
Database :
Directory of Open Access Journals
Journal :
Crystals
Publication Type :
Academic Journal
Accession number :
edsdoj.843bce731c4448b5b18dab3854eae5
Document Type :
article
Full Text :
https://doi.org/10.3390/cryst11091031