Is there a field-induced spin-liquid phase in $\alpha$-RuCl3?

For in-plane fields between the zigzag critical field $H_c1$ (about 70 to 80 kOe) and full polarization, determine whether a distinct thermodynamic phase bounded by phase transitions (in specific heat, magnetocaloric effect, magnetostriction) exists, whether its excitations form a fractionalized continuum or multi-magnon bound states, and whether the oscillatory features of $\kappa_{xx}(H)$ at $T < 1\ \mathrm{K}$ in this window mark intrinsic transitions or shifted phase boundaries of stacking inclusions. An answer is a phase diagram with identified boundaries and a classification of the intermediate state.

Thermodynamic measurements resolving or excluding a second transition above $H_c1$ on stacking-controlled crystals, combined with neutron and THz spectra fitted by a calibrated spin model.