Fragile ground state and rigid field-induced structures in the zigzag ladder compound BaDy2O4

Article

关键词: LUMINESCENCE;    BALN(2)O(4);    MAGNETISM;    EU3+;    LN;   

DOI  :  10.1103/PhysRevB.103.134434

来源: SCIE

【 摘 要 】

We report on a sequence of field-induced transitions in the zigzag ladder compound BaDy2O4 studied with powder neutron diffraction and magnetization measurements. In agreement with the previously published results, the low-temperature zero-field structure is characterized by two half-integer propagation vectors k(1) = [1/2 0 1/2] and k(2) = [1/2 1/2 1/2]. However, on application of an external magnetic field, the Bragg peaks corresponding to the zero-field structure lose their intensity rather rapidly and disappear completely in a field of 2.5 kOe. In the intermediate fields, 2.5 to 22.5 kOe, new peaks are observed characterized by the propagation vector k' = [0 0 1/3] corresponding to an up-up-down (uud) structure as well k = 0 ferromagnetic peaks. This regime of fields 3 corresponds to a pronounced plateau in the magnetization curve. Remarkably, the uud structure survives heating to at least 1.4 K, three times higher temperature than the T-N of 0.48 K for the zero-field structure. Above 22.5 kOe, the k' peaks disappear while the k = 0 peaks gain significant intensity indicating an increase in the polarization of the system. The analysis of the intensities of the field-induced reflections allows for a clear identification of the magnetic structures in both the intermediate- and high-field regimes.

【 授权许可】

Free