Abstract
The authors show the intertwining of field-induced phases and magnetic phase transitions in $\ensuremath{\beta}$-Li${}_{2}$IrO${}_{3}$, a three-dimensional Kitaev magnet, as manifested by a reentrance of the incommensurate counter-rotating order for fields in the ab-plane, and the onset of characteristic torque discontinuities
Highlights
In recent years, a significant experimental and theoretical effort has been devoted to realization of the Kitaev quantum spin liquid phase [1] in 4d and 5d magnetic insulators [2,3,4,5,6,7,8,9,10,11]
The extension of this approach for fields applied in the ab, bc, and ac planes shows that the interpolation of the phase diagram from one crystallographic axis to another comes with a number of unexpected results, including (i) a reentrant IC phase that survives in a finite region of field strengths and orientations for fields in the ab plane, (ii) a region featuring a two-step disappearance of the IC order, proceeding via two consecutive metamagnetic jumps, and (iii) large discontinuous reversals of the magnetic torque, with characteristic sawtoothlike angular profiles that resemble closely the ones reported for γ -Li2IrO3
We find that while the critical field H∗ grows very fast as we approach the a axis, reflecting the inequalities Hb∗ < Hc∗ Ha∗ found in Ref. [31], the way H ∗ grows in the ab plane gives rise to a reentrant IC order in a finite range of field orientations, see inset of Fig. 2(b)
Summary
A significant experimental and theoretical effort has been devoted to realization of the Kitaev quantum spin liquid phase [1] in 4d and 5d magnetic insulators [2,3,4,5,6,7,8,9,10,11]. Which does not restore all broken symmetries, which in turn gives rise to a second transition at Hc∗∗ that survives at finite temperatures [31] The extension of this approach for fields applied in the ab, bc, and ac planes shows that the interpolation of the phase diagram from one crystallographic axis to another comes with a number of unexpected results, including (i) a reentrant IC phase that survives in a finite region of field strengths and orientations for fields in the ab plane (and to a lesser extent in the ac plane), (ii) a region featuring a two-step disappearance of the IC order, proceeding via two consecutive metamagnetic jumps, and (iii) large discontinuous reversals of the magnetic torque, with characteristic sawtoothlike angular profiles that resemble closely the ones reported for γ -Li2IrO3.
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