Multiple magnetic transitions in the spin-1/2 chain antiferromagnet SrCuTe2O6

作者：Ahmed N^*; Tsirlin A A; Nath R

来源：Physical Review B, 2015, 91(21): 214413.

DOI：10.1103/PhysRevB.91.214413

By using thermodynamic measurements and density-functional band-structure calculations, we explore the magnetic behavior of SrCuTe2O6. Despite being a structural sibling of a three-dimensional frustrated system PbCuTe2O6, this spin-1/2 quantum magnet shows remarkably different low-temperature behavior. Above 7 K, magnetic susceptibility of SrCuTe2O6 follows the spin-chain modelwith the antiferromagnetic intrachain coupling of J similar or equal to 49.3 K. We ascribe this quasi-one-dimensional behavior to the leading third-neighbor coupling that involves a weakly bent Cu-O center dot center dot center dot O-Cu superexchange pathway with a short O center dot center dot center dot O contact of 2.79 angstrom. Below 5 K, SrCuTe2O6 undergoes two consecutive magnetic transitions that may be triggered by the frustrated nature of interchain couplings. The field dependence of the magnetic transitions (phase diagram) is reported.

• 出版日期2015-6-8