Revealing quantum spin liquid in the herbertsmithite $\mathrm{ZnC}{\mathrm{u}}_3(\mathrm{OH}{)}_6\mathrm{C}{\mathrm{l}}_2$

Abstract

Based on experimental data and our theoretical analysis, we provide a strategy for unambiguous establishing of gapless quantum spin liquid state (QSL) in herbertsmithite and other materials. To clarify the nature of QSL, we recommend measurements of heat transport, low-energy inelastic neutron scattering and optical conductivity under the application of external magnetic field at low temperatures. We also suggest that artificially introduced inhomogeneity into $\mathrm{ZnC}{\mathrm{u}}_3(\mathrm{OH}{)}_6\mathrm{C}{\mathrm{l}}_2$ can stabilize QSL, and serves as a test elucidating the contribution coming from impurities. We predict the results of these measurements in the case of gapless QSL.

6 pages, 5 figures. Invited report at the Winter School, PNPI 2018