Charge transport in the organic doped spin-liquid candidate, $\kappa$-(ET)$_{4}$Hg$_{2.89}$Br$_{8}$, under Pressure

The family of layered organic conductors $\kappa$-(ET)$_{2}$X plays an important role in the study of Mott physics, which is a major subject in the condensed matter physics. While most $\kappa$-(ET)$_{2}$X compounds have half-filled bands and antiferromagnetic nature, the title compound $\kappa$-(ET)$_{4}$Hg$_{2.89}$Br$_{8}$ ($\kappa$-HgBr) is an exceptional doped system which is supposed to be the only doped spin-liquid candidate up to the present. The transport study under controlled pressure, which enables us to investigate this intriguing system with tuning the correlation strengths, revealed that $\kappa$-HgBr shows a transition or crossover from a non-Fermi liquid to a Fermi-liquid as pressure increases.\footnote{H. Taniguchi \textit{et al}., J. Phys. Soc. Jpn. \textbf{76}, 113709 (2007).}$^{,}$\footnote{H. Oike \textit{et al}., Phys. Rev. Lett. \textbf{114}, 067002 (2015).} In the present work, we have carried out the detailed transport measurement under pressure for $\kappa$-HgBr with static magnetic fields applied normal to the conducting layers. I will discuss the in-plane and out-of-plane charge transport in normal and superconducting states in this doped spin-liquid candidate with variable electron correlation.