In this work, we study magnetic properties and magnetic structure of the frustrated one-dimensional
antiferromagnet SrCuTe_{2}O_{6}. Noncentrosymmetric SrCuTe_{2}O_{6} crystallizes in
the chiral cubic space group P4132 with lattice parameter a = 12.473(1) Å. The crystal structure
consists of CuO4 square plates, units of TeO_{3}, and oxygen octahedra surrounding strontium (Sr) atoms.
The Cu2^{+} ions in the CuO_{4} plaquettes carry spin 1/2 and give rise to the magnetic
properties of this system. The spin network for S=1/2 Cu2^{+} spins consists of three types of
intertwined networks connected by the nearest-, second-nearest-, and third-nearest-neighbor exchange interactions
J_{1} , J_{2} , and J_{3}, respectively. The spins connected by
J_{1} form an isolated triangle with Cu-O-Sr- O-Cu superexchange pathways. The second-nearest-neighbor
network formed by J_{2} via Cu-O-Te-O-Cu pathways connect the spins to form a hyper-kagome
network. J3 links the spins to form spin chains along the cubic
crystallographic axes. First principle calculations performed to estimate the strength of these exchange
interactions showed that, J3 is the most dominant with J2 about 10% of J3 and J1 about 1% of J3, and established
that SrCuTe2O6 is a spin-chain system with relatively weak and intricate frustrated interchain couplings.

Our magnetization measurements on single-crystal SrCuTe2O6 reveal highly isotropic magnetic susceptibility along
the three inequivalent directions [100], [110], and [111] in this cubic system. The value of the leading
exchange interaction (J3/kB) estimated using a quantum Monte Carlo simulation on the 1D spin-chain model is
between 50.1 and 52.5 K. The order parameter measured by neutron scattering confirms that the system
magnetically orders below TN_{1} = 5.25(5) K. However, from our zero-field neutron diffraction
measurements, we are unable to confirm the field-dependent second transition at lower TN_{2}, which was
previously observed in magnetization and heat capacity measurements. Further in-field neutron scattering
measurements are required to investigate this second transition. Based on the neutron diffraction data on the
powder and single-crystal samples, the magnetic structure in the Shubnikov space group P4132, where the
Cu2_{+} S = 1/2 spins antiferromagnetically align along the direction perpendicular to the spin chain, is
proposed with the ordered magnetic moment of 0.52(6)μ_{B}. This work suggests the dominance of the
intrachain interaction J_{3} over the frustrated J_{1} and J_{2} bonds, and sheds light on
the difference in magnetic ground states between SrCuTe_{2}O_{6} and
PbCuTe_{2}O_{6}. The 48% reduction of the ordered moment in SrCuTe2O6 points to the residual
effect of frustration, which could have nontrivial influence on spin dynamics in this magnetically ordered system.

*Reference*

P. Saeaun , Y. Zhao, P. Piyawongwatthana, T. J. Sato, F. C. Chou, M. Avdeev,
G. Gitgeatpong, and K. Matan, *Physical Review B* **102**, 134407 (2020).
[link]
[arXiv:2007.03268]