Samartzis, A.; Chillal, S.; Islam, A.T.M.N.; Siemensmeyer, K.; Prokes, K.; Voneshen, D.J.; Senyshyn, A.; Khalyavin, D.; Lake, B.: Structural and magnetic properties of the quantum magnet BaCuTe2O6. Physical Review B 103 (2021), p. 094417/1-13
10.1103/physrevb.103.094417
Open Access Version
Abstract:
We investigate the structural and magnetic properties of the quantum magnet BaCuTe2O6. This compound is synthesized in powder and single crystal form for the first time. Synchrotron x-ray and neutron diffraction reveal a cubic crystal structure (P4132) where the magnetic Cu2+ ions form a complex network. Heat capacity and static magnetic susceptibility measurements suggest the presence of antiferromagnetic interactions with a Curie-Weiss temperature of ≈−33 K, while long-range magnetic order occurs at the much lower temperature of ≈6.3 K. The magnetic structure, solved using neutron diffraction, reveals antiferromagnetic order along chains parallel to the a, b, and c crystal axes. This is consistent with the magnetic excitations which resemble the multispinon continuum typical of the spin-1/2 Heisenberg antiferromagnetic chain. A consistent intrachain interaction value of ≈34 K is achieved from the various techniques. Finally the magnetic structure provides evidence that the chains are coupled together in a noncollinear arrangement by a much weaker antiferromagnetic, frustrated hyperkagome interaction.