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

paper

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)

arXiv:2402.16768

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.

7 pages, 4 figures

Synthesis, structural and magnetic characterizations of Li4​Cu1−x​Nix​TeO6​ ( x = 0, 0.1, 0.2, 0.5, and 1)

Abstract

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)