Symmetry analysis of k = (1/3,1/3,0) three-sublattice ordering in A14B51 compounds

TL;DR

This paper investigates the magnetic structure of Tb14Ag51, revealing a novel k = (1/3,1/3,0) three-sublattice ordering through symmetry analysis and experimental measurements, expanding understanding of magnetic arrangements in A14B51 compounds.

Contribution

It introduces a new magnetic ordering pattern in A14B51 compounds and provides a comprehensive symmetry analysis for k = (1/3,1/3,0) structures.

Findings

Identification of a new magnetic k = (1/3,1/3,0) ordering in Tb14Ag51

Experimental confirmation of magnetic ordering below 27.5 K

General analysis applicable to similar A14B51 compounds

Abstract

Bulk magnetic, X-ray and neutron diffraction measurements were performed on polycrystalline Tb14Ag51 in the temperature range from 1.5 K to room temperature. Its chemical Gd14Ag51 type structure corresponds to space group P6/m. Combined with group theoretical symmetry analysis, we show that the magnetic structure of this intermetallic compound is of a new k = (1/3,1/3,0) type with three magnetic Tb sublattices ordering simultaneously below TN = 27.5(5) K according to the combined irreducible representations tau4 and tau6. Here we present a general analysis of possible magnetic A ordering for k = (1/3,1/3,0) in A14B51 compounds.