New Gd-based magnetic compound GdPt${}_2$B with a chiral crystal structure

Abstract

Herein, we report the discovery of a novel Gd-based magnetic compound GdPt${}_2$B with a chiral crystal structure. X-ray diffraction and chemical composition analyses reveal a CePt${}_2$B-type crystal structure (space group: $P{6}_{4}22$) for GdPt${}_2$B. Moreover, we successfully grew single crystals of GdPt${}_2$B using the Czochralski method. Magnetization measurements and the Curie$-$Weiss analysis demonstrate that the ferromagnetic interaction is dominant in GdPt${}_2$B. A clear transition is observed in the temperature dependence of electrical resistivity, magnetic susceptibility, and specific heat at $T_{\mathrm{O}}$ = 87 K. The magnetic phase diagram of GdPt${}_2$B, which consists of a field-polarized ferromagnetic region and a magnetically ordered region, resembles those of known chiral helimagnets. Furthermore, magnetic susceptibility measurements reveal a possible spin reorientation within the magnetically ordered phase in magnetic fields perpendicular to the screw axis. The results demonstrate that GdPt${}_2$B is a suitable platform for investigating the competing effects of ferromagnetic and antisymmetric exchange interactions in rare-earth-based chiral compounds.

9 pages, 7 figures. To be published in Phys. Rev. Materials

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