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arXiv · 2402.16768

Synthesis, structural and magnetic characterizations of Li$_4$Cu$_{1-x}$Ni$_x$TeO$_6$ ( $x$ = 0, 0.1, 0.2, 0.5, and 1)

Ashiwini Balodhi·Brianna Billingsley·Tai Kong·Min Gyu Kim
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Abstract

We investigated the effect of Ni doping in a recently proposed quantum spin liquid (QSL) candidate Li$_4$CuTeO$_6$. We performed a comprehensive study on the structural and magnetic properties. We find that the anti-site disorder between Li$^+$ and Cu$^{2+}$ persists until 50\% Ni doping in which Ni and Cu occupy different crystallographic sites. As a result, while Cu sits in both triangular and honeycomb layers in Li$_4$CuTeO$_6$, Ni forms only honeycomb layer in Li$_4$NiTeO$_6$ and Li$_4$Cu$_{0.5}$Ni$_{0.5}$TeO$_6$. Our magnetic susceptibility measurements show that the Weiss temperature decreases from -145.68 K in Li$_4$CuTeO$_6$ to -6.15 K in Li$_4$NiTeO$_6$ as Ni doping increases, and find no hint of magnetic ordering or freezing down to 1.8 K. Our analysis implies the existence of abundant low energy excitations in these materials.

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Ashiwini Balodhi, Brianna Billingsley, Tai Kong, Min Gyu Kim. 2024-02-26. Synthesis, structural and magnetic characterizations of Li$_4$Cu$_{1-x}$Ni$_x$TeO$_6$ ( $x$ = 0, 0.1, 0.2, 0.5, and 1). https://arxiv.org/abs/2402.16768

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