Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids
TT 46.9: Poster
Wednesday, March 18, 2020, 15:00–19:00, P2/2OG
ESR investigations of disorder effects in organic spin-liquid compounds — •Björn Miksch1, John A. Schlueter2, Martin Dressel1, and Marc Scheffler1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4831 and National Science Foundation, Alexandria, Virginia 2223, USA
Although many low temperature properties of the organic spin-liquid candidate κ-(ET)2Cu2(CN)3 have been studied experimentally, a comprehensive description is still difficult. Disorder effects have been recently suggested to provide an explanation for the intriguing magnetic and thermodynamic properties. In this study we present electron spin resonance measurements performed with conventional spectrometers as well as with our on-chip approach. This allows us to cover temperatures from 300 K to the mK regime in a broad range of magnetic fields. The results indicate the presence of local moments at very low temperatures supporting the importance of disorder for the low temperature magnetic state.