Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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



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


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.
Inorganic Chemistry


Chemistry, New Materials, Crystallography, Magnetism, Mott insulator


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