Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2CuIrO6

作者：Manna Kaustuv; Sarkar R; Fuchs S; Onykiienko Y A; Bera A K; Cansever G Aslan; Kamusella S; Maljuk A; Blum C G F; Corredor L T; Wolter A U B; Yusuf S M; Frontzek M; Keller L; Iakovleva M; Vavilova E; Grafe H J; Kataev V; Klauss H H; Inosov D S; Wurmehl S; Buechner B B

来源：Physical Review B, 2016, 94(14): 144437.

DOI：10.1103/PhysRevB.94.144437

We report the structural, magnetic, and thermodynamic properties of the double perovskite compound La2CuIrO6 from x-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation (mu SR), electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) measurements. Below similar to 113 K, short-range spin-spin correlations occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+ sublattice is progressively involved in the correlation process. Below T = 74 K, the magnetic sublattices of Cu (spin s = 1/2) and Ir (pseudospin j = 1/2) in La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase transition into a noncollinear magnetic structure accompanied by a small uncompensated transverse moment. A weak anomaly in ac susceptibility as well as in the NMR and mu SR spin lattice relaxation rates at 54 K is interpreted as a cooperative ordering of the transverse moments which is influenced by the strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic behavior observed in La2CuIrO6 is related to complex magnetic interactions between the strongly correlated spin-only 3d ions with the strongly spin-orbit coupled 5d transition ions where a combination of the spin-orbit coupling and the low symmetry of the crystal lattice plays a special role for the spin structure in the magnetically ordered state.

• 出版日期2016-10-25