Growth and Helicity of Noncentrosymmetric Cu2OSeO3 Crystals

Aisha Aqeel,Guowei Li,Jacob Baas,Graeme R. Blake,Christian H. Back,Thomas T. M. Palstra,Jan Sahliger

doi:10.1002/pssb.202100152

Abstract

single crystals are grown with an optimized chemical vapor transport technique using as a transport agent (TA). The optimized growth method allows to selectively produce large high‐quality single crystals. The method is shown to consistently produce crystals of maximum size 8 × 7 × 4 mm with a transport duration of around three weeks. It is found that this method, with as TA, is more efficient and simple compared with the commonly used growth techniques reported in literature with HCl gas as TA. The crystals have very high quality and their absolute structures are fully determined by simple single‐crystal X‐ray diffraction. Enantiomeric crystals with either left‐ or right‐handed chiralities are observed. The magnetization and ferromagnetic resonance data show the same magnetic phase diagram as reported earlier.

Highlights

Cu2OSeO3 single crystals are grown with an optimized chemical vapor transport technique using SeCl4 as a transport agent (TA)
The energy-dispersive spectrometer (EDS) elemental mapping (Figure 1b–d) demonstrates that the Cu, O, and Se atoms are uniformly distributed, which unambiguously reveals the uniformity of the single crystal
The vapor transport technique[23] commonly used for the growth of Cu2OSeO3 single crystals is relatively slow and complex due to use of the hydrogen chloride (HCl) gas as TA

Summary

Introduction

They appear in a small magnetic field– temperature (B–T ) pocket close to transition temperature Tc. In the chiral atomic framework of this crystal family, the orbital motions of localized electrons take helical paths. 1. Introduction relativistic spin–orbit interaction called Dzyaloshinskii–Moriya (DM) interaction.[7,8] As the sign of the DM interaction is determined by the chemical composition, it Investigation of complex magnetic systems[1] is generally limited by an inability to obtain sufficiently large, pure high-quality crystals. Introduction relativistic spin–orbit interaction called Dzyaloshinskii–Moriya (DM) interaction.[7,8] As the sign of the DM interaction is determined by the chemical composition, it Investigation of complex magnetic systems[1] is generally limited by an inability to obtain sufficiently large, pure high-quality crystals This is especially true for the noncentrosymmetric magnets with chirality.

Results

Discussion

Conclusion