paper

Na $_{5}$ Co $_{15.5}$ Te $_{6}$ O $_{36}$ : an $S$ = 1/2 stacked Ising kagome antiferromagnet with a partially disordered ground state

arXiv:2204.00177 · doi:10.1103/PhysRevB.105.144406

Abstract

$S$ = 1/2 Ising kagome antiferromagnets (KAFs) are rare in reality. In this work, we report the magnetic ground state and field-induced transitions of an $S$ = 1/2 Ising antiferromagnet with a stacked kagome geometry, Na $_{5}$ Co $_{15.5}$ Te $_{6}$ O $_{36}$ . Upon cooling, magnetic susceptibility measurement reveals three successive magnetic transitions at $T_{1}$ = 45.2 K, $T_{2}$ = 35.4 K, and $T_{3} \sim$ 20 K. When the magnetic field is applied along the Ising $c$ axis, a strikingly anomalous initial magnetization lying outside the hysteresis loop is observed below $T_{3}$ . Through the detailed characterizations, the magnetic field $v s$ temperature phase diagram is established. A partially disordered antiferromagnetic state is proposed below $T_{1}$ , which becomes frozen below $T_{3}$ . Na $_{5}$ Co $_{15.5}$ Te $_{6}$ O $_{36}$ is therefore a promising candidate for $S$ = 1/2 Ising KAFs, and this unique composite structure may shed light on the exploratory path for $S$ = 1/2 Ising KAFs.

9 pages, 9 pictures, to be published in PRB

Na5​Co15.5​Te6​O36​: an S = 1/2 stacked Ising kagome antiferromagnet with a partially disordered ground state

Abstract

Na $_{5}$ Co $_{15.5}$ Te $_{6}$ O $_{36}$ : an $S$ = 1/2 stacked Ising kagome antiferromagnet with a partially disordered ground state