Kavli Affiliate: Alessandra Lanzara
| Summary:
$α$-RuCl$_3$ is considered to be the top candidate material for the experimental realization of the celebrated Kitaev model. It is however known that additional interactions beyond the Kitaev model trigger in $α$-RuCl$_3$, a long-range zigzag antiferromagnetic ground state. In this work, we investigate a nanoflake of $α$-RuCl$_3$ through guarded high impedance measurements aimed at reaching through electronic transport, the regime where the system turns into a zigzag antiferromagnet. We investigated a variety of temperatures (SI1.45kelvin – SI175kelvin) and out-of-plane magnetic fields ranging up to SI11tesla. We found a clear signature of a structural phase transition at $approx 160$,K as reported for thin crystals of $α$-RuCl$_3$, as well as a thermally activated behavior at temperatures above $approx 30$,K with a characteristic activation energy significantly smaller than the energy gap that we observe for $α$-RuCl$_3$ bulk crystals through our Angle Resolved Photoemission Spectroscopy (ARPES) experiments. Additionally we found that below $approx 30$,K, transport is ruled by Efros-Shklovskii (ES) VRH. These observations point to the presence of Coulomb impurities in our thin crystals. Most importantly, our data shows that below the magnetic ordering transition known for bulk $α$-RuCl$_3$ ($approx 7$,K), there is a clear deviation from VRH or thermal activation transport mechanisms. Our work demonstrates the possibility of reaching through specialized high impedance measurements, the thrilling ground states predicted for $α$-RuCl$_3$ at low temperatures in the frame of the Kitaev model, and informs about the transport mechanisms in this material in a wide temperature range as well as on important characteristic quantities such as the localization length of the impurities in a thin $α$-RuCl$_3$ crystal.
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