Abstract
Spin-liquid materials can be tailored by chemical substitutions. Here, the authors use thermodynamic measurements and electron spin resonance to show that replacing Na by K in triangular magnets of the $A$YbO${}_{2}$ family weakens the magnetic couplings and renders the Yb${}^{3+}$ ion more isotropic. They map out the temperature-field phase diagram and demonstrate that the field-induced plateau phase corresponds to 1/2 of the saturated magnetization.
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