Fig. 2: Magnetic and thermodynamic properties of KCu6AlBiO4(SO4)5Cl.
From: Gapless spin liquid in a square-kagome lattice antiferromagnet
a Temperature dependence of the magnetic susceptibility χ (open red circles) and the inverse susceptibilities 1/χ (open blue circles) of KCu6AlBiO4(SO4)5Cl measured at 1 T. The χ is obtained by subtracting the Pascal's diamagnetic contribution from the experimental data. The solid grey lines denote the fitting curves by the Curie–Weiss law. b High-field magnetisation measured up to 60 T at 1.8 K. The observed data Mobs. (filled red circles) are broken down into two components: Mbulk (black solid line) and Mfree (open green circles). Inset shows the magnetisation measured using MPMS at 1.8 K. The grey line is the Brillouin function for g = 2 and 2.4% of free S = 1/2 spins. c Temperature dependence of the total specific heat measured at zero field (filled red circles). The grey line is the assumed lattice contribution Clattice. = 0.000555T3. The green dashed line is the estimated magnetic entropy. Inset shows a log-log plot of the same data.
