%0 Journal Article %T Quantum spin-liquid states in an organic magnetic layer and molecular rotor hybrid %+ Ecole Polytechnique Fédérale de Lausanne (EPFL) %+ MOLTECH-Anjou %+ Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences (IOCB / CAS) %+ Laboratoire de Physique des Solides (LPS) %+ Institut für Theoretische Physik [Frankfurt am Main] (ITP) %+ Science and Technology Facilities Council (STFC) %+ Paul Scherrer Institute (PSI) %A Szirmai, Péter %A Mézière, Cécile %A Bastien, Guillaume %A Wzietek, Pawel %A Batail, Patrick %A Martino, Edoardo %A Mantulnikovs, Konstantins %A Pisoni, Andrea %A Riedl, Kira %A Cottrell, Stephen %A Baines, Christopher %A Forró, László %A Náfrádi, Bálint %< avec comité de lecture %@ 0027-8424 %J Proceedings of the National Academy of Sciences of the United States of America %I National Academy of Sciences %P 202000188 %8 2020-11-05 %D 2020 %R 10.1073/pnas.2000188117 %K quantum spin liquid %K QSL %K molecular rotor %K triangular lattice %K quenched randomness %Z Physics [physics]Journal articles %X The exotic properties of quantum spin liquids (QSLs) have continually been of interest since Anderson’s 1973 ground-breaking idea. Geometrical frustration, quantum fluctuations, and low dimensionality are the most often evoked material’s characteristics that favor the long-range fluctuating spin state without freezing into an ordered magnet or a spin glass at low temperatures. Among the few known QSL candidates, organic crystals have the advantage of having rich chemistry capable of finely tuning their microscopic parameters. Here, we demonstrate the emergence of a QSL state in [EDT-TTF-CONH2]2+[BABCO−] (EDT-BCO), where the EDT molecules with spin-1/2 on a triangular lattice form layers which are separated by a sublattice of BCO molecular rotors. By several magnetic measurements, we show that the subtle random potential of frozen BCO Brownian rotors suppresses magnetic order down to the lowest temperatures. Our study identifies the relevance of disorder in the stabilization of QSLs. %G English %L hal-03000261 %U https://univ-angers.hal.science/hal-03000261 %~ CNRS %~ UNIV-ANGERS %~ INC-CNRS %~ UNIV-PARIS-SACLAY %~ MOLTECH-ANJOU %~ TEST-HALCNRS %~ UNIVERSITE-PARIS-SACLAY %~ GS-CHIMIE %~ GS-LIFE-SCIENCES-HEALTH %~ INSTITUT-SCIENCES-LUMIERE %~ LPSO