Field-induced evolution of magnetic ordering in the quantum spin system (CuBr)Sr2Nb3O10 with a 1/3 magnetization plateau

作者：Ritter C; Yusuf S M^*; Bera A K; Goto Y; Tassel C; Kageyama H; Arevalo Lopez A M; Attfield J P

来源：Physical Review B, 2013, 88(10): 104401.

DOI：10.1103/PhysRevB.88.104401

The field-induced evolution of the magnetic ordering in (CuBr)Sr2Nb3O10 with a 1/3 magnetization plateau has been investigated by neutron diffraction under magnetic fields up to 10 T. With an increasing magnetic field, the zero-field helical antiferromagnetic (AFM) phase, AF1, with kappa = [0 3/8 1/2] is replaced by a simple ferromagnetic phase with. = [0 0 0], the formation of which is, however, retarded by the appearance of a second AFM, AF2, with kappa = [0 1/3 similar to 0.46]. Upon further increasing of the magnetic field, the AF2 phase disappears and only the ferromagnetic phase persists. The results clearly show that the magnetization plateau, induced by the competition between field-induced ferromagnetic, F, and AF2 phases, is coincidentally situated at M = 1/3 M-S of the dc magnetization curve. The AF1 and AF2 phases have strongly differing magnetic propagation vectors and are therefore not directly related.

• 出版日期2013-9-3