Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states

Abstract

The tuning of magnetic phase, chemical potential, and structure is crucial to observe diverse exotic topological quantum states in $MnB{i}_{2}T{e}_4(B{i}_{2}T{e}_3{)}_m$ (m = 0, 1, 2, & 3). Here we show a ferromagnetic (FM) phase with a chiral crystal structure in $Mn(B{i}_{1-x}S{b}_x{)}_{4}T{e}_7$, obtained via tuning the growth conditions and Sb concentration. Unlike previously reported $Mn(B{i}_{1-x}S{b}_x{)}_{4}T{e}_7$, which exhibits FM transitions only at high Sb doping levels, our samples show FM transitions ($T_C$ = 13.5 K) at 15%-27% doping levels. Furthermore, our single crystal x-ray diffraction structure refinements find Sb doping leads to a chiral structure with the space group of P3, contrasted with the centrosymmetric P-3m1 crystal structure of the parent compound $MnB{i}_{4}T{e}_7$. Through ARPES measurements, we also demonstrated that the non-trivial band topology is preserved in the Sb-doped FM samples. Given that the non-trivial band topology of this system remains robust for low Sb doping levels, our success in making FM $Mn(B{i}_{1-x}S{b}_x{)}_{4}T{e}_7$ with $x$ = 0.15, 0.175, 0.2 & 0.27 paves the way for realizing the predicted topological quantum states such as axion insulator and Weyl semimetals. Additionally, we also observed magnetic glassy behavior in both antiferromagnetic $MnB{i}_{4}T{e}_7$ and FM $Mn(B{i}_{1-x}S{b}_x{)}_{4}T{e}_7$ samples, which we believe originates from cluster spin glass phases coexisting with long-range AFM/FM orders. We have also discussed how the antisite Mn ions impact the interlayer magnetic coupling and how FM interlayer coupling is stabilized in this system.

37 Pages, 7 Figures and 2 Tables. Supplementary Materials is included

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• Spectroscopic evidence of intra-unit-cell charge redistribution in charge-neutral magnetic topological insulator Sb-doped MnBi6Te10
• Relationship among Structural, Disordered, Magnetism and Band Topology in MnSb2Te4(Sb2Te3)n Family
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