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Antiferromagnetic Order and Spin-Canting Transition in the Corrugated Square Net Compound Cu3(TeO4)(SO4)·H2O

Published

Author(s)

Zhi-Cheng Wang, Kulatheepan Thanabalasingam, Jan P. Scheifers, Alenna Streeter, Gregory T. McCandless, Jonathan N. Gaudet, Craig Brown, Carlo U. Segre, Julia Y. Chan, Fazel Tafti

Abstract

Strongly correlated electrons in layered perovskite structures have been the birthplace of high-temperature superconductivity, spin liquid, and quantum criticality. Specifically, the cuprate materials with layered structures made of corner sharing square planar CuO4 units have been intensely studied due to their Mott insulating grounds state which leads to high-temperature superconductivity upon doping. Identifying new compounds with similar lattice and electronic structures has become a challenge in solid state chemistry. Here, we report the hydrothermal crystal growth of a new copper tellurite sulfate Cu3(TeO4)(SO4)·H2O, a promising alternative to layered perovskites. The orthorhombic phase (space group Pnma) is made of corrugated layers of corner-sharing CuO4 square-planar units that are edge-shared with TeO4 units. The layers are linked by slabs of corner-sharing CuO4 and SO4. Using both the bond valence sum analysis and magnetization data, we find purely Cu2+ ions within the layers, but a mixed valence of Cu2+/Cu+ between the layers. Cu3(TeO4)(SO4)·H2O undergoes an antiferromagnetic transition at TN=67 K marked by a peak in the magnetic susceptibility. Upon further cooling, a spin-canting transition occurs at T*=12 K evidenced by a kink in the heat capacity. The spin-canting transition is explained based on a J1-J2 model of magnetic interactions, which is consistent with the slightly different in-plane super-exchange paths. We present Cu3(TeO4)(SO4)·H2O as a promising platform for the future doping and strain experiments that could tune the Mott insulating ground state into superconducting or spin liquid states.
Citation
Inorganic Chemistry
Volume
60
Issue
14

Keywords

Chemistry, New Materials, Crystallography, Magnetism, Mott insulator

Citation

Wang, Z. , Thanabalasingam, K. , Scheifers, J. , Streeter, A. , McCandless, G. , Gaudet, J. , Brown, C. , Segre, C. , Chan, J. and Tafti, F. (2021), Antiferromagnetic Order and Spin-Canting Transition in the Corrugated Square Net Compound Cu<sub>3</sub>(TeO<sub>4</sub>)(SO<sub>4</sub>)&#183;H<sub>2</sub>O, Inorganic Chemistry (Accessed February 26, 2024)
Created July 18, 2021, Updated November 29, 2022