Freezing of a disorder induced quantum spin liquid

TL;DR

This study investigates a square-lattice magnet that transitions from a gapless quantum spin liquid to a weakly frozen quantum state below 1.7 K, revealing unexpected low-energy dynamics and weak magnetic freezing.

Contribution

It provides the first detailed neutron scattering evidence of a transition from a disorder-induced quantum spin liquid to a new quantum state with weak freezing.

Findings

Transition from gapless quantum spin liquid to frozen state below 1.7 K

Presence of a weak frozen magnetic moment (~0.1 S)

Low-energy susceptibility linear in energy

Abstract

$\rm{Sr_2CuTe_{0.5}W_{0.5}O_6}$ is a square-lattice magnet with super-exchange between S=1/2 $\rm{Cu^{2+}}$ spins mediated by randomly distributed Te and W ions. Here, using sub-K temperature and 20 $\rm{\mu}$eV energy resolution neutron scattering experiments we show that this system transits from a gapless disorder-induced quantum spin liquid to a new quantum state below $\rm{T_f}$ = 1.7(1) K, exhibiting a weak frozen moment of <S>/S ~ 0.1 and low energy dynamic susceptibility,${\chi}''({\hbar\omega})$ linear in energy which is surprising for such a weak freezing in this highly fluctuating quantum regime.