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

TL;DR

This paper reports the discovery and characterization of a new Gd-based chiral magnetic compound GdPt$_2$B, highlighting its crystal structure, magnetic properties, and potential for studying complex magnetic interactions.

Contribution

The study introduces GdPt$_2$B as a novel chiral magnetic compound with detailed structural and magnetic analysis, expanding the understanding of rare-earth-based chiral magnets.

Findings

GdPt$_2$B has a CePt$_2$B-type chiral crystal structure.

Displays a magnetic transition at 87 K with ferromagnetic interactions.

Shows a magnetic phase diagram similar to known chiral helimagnets.

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: $P6_422$) 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 $T_{\rm O}$ = 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.