Kavli Affiliate: Gang Su
| First 5 Authors: Xu-Guang Zhou, Xu-Guang Zhou, , ,
| Summary:
The identification of quantum spin liquid phases in Kitaev candidate
materials remains a major experimental challenge. Since most Kitaev candidates
develop antiferromagnetic (AFM) order at low temperatures, currently there are
great interest on the field-induced magnetic disordered phase in these
compounds, that are distinct from (partially) polarized states. Recently, a
cobaltate Na$_2$Co$_2$TeO$_6$ has emerged as a promising Kitaev candidate with
high-spin $t^5_2ge^2_g$ configuration and spin-orbit entangled $J_rm eff
= 1/2$ honeycomb lattice system. There are intensive studies on field-induced
magnetic states and phase transitions under in-plane magnetic fields. In this
study, we identify an intermediate disordered phase induced by an out-of-plane
field along the $c$-axis, through high-field magnetization and magnetocaloric
effect measurements. To explain the high-field behavior of Na$_2$Co$_2$TeO$_6$,
we develop an effective $K$-$J$-$Gamma$-$Gamma^prime$ spin model featuring
a dominant AFM Kitaev interaction. This framework uncovers an intermediate
quantum spin liquid phase, establishing the material as a unique platform for
exploring Kitaev physics and field-induced quantum-disordered states.
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