Topological Electronic Structure and Intrinsic Magnetization in MnBi4Te7: A Bi2Te3 Derivative with a Periodic Mn Sublattice

Combinations of nontrivial band topology and long-range magnetic order hold promise for realizations of novel spintronic phenomena, such as the quantum anomalous Hall effect and the topological magnetoelectric effect. Following theoretical advances, material candidates are emerging. Yet, so far a co...

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Bibliographic Details
Published in:Physical review. X 2019-12, Vol.9 (4)
Main Author: Vidal, Raphael C
Format: Article
Language:English
Subjects:
Absolute zero
Antiferromagnetism
Bismuth tellurides
Crystal structure
Electronic properties
Electronic structure
Ferromagnetism
Magnetic properties
Magnetization
Mathematical analysis
Number theory
Photoelectric emission
Quantum Hall effect
Quantum phenomena
Single crystals
Topological insulators
Topology
Valence band
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Summary:Combinations of nontrivial band topology and long-range magnetic order hold promise for realizations of novel spintronic phenomena, such as the quantum anomalous Hall effect and the topological magnetoelectric effect. Following theoretical advances, material candidates are emerging. Yet, so far a compound that combines a band-inverted electronic structure with an intrinsic net magnetization remains unrealized.MnBi2Te4has been established as the first antiferromagnetic topological insulator and constitutes the progenitor of a modular(Bi2Te3)n(MnBi2Te4)series. Here, forn=1, we confirm a nonstoichiometric composition proximate toMnBi4Te7. We establish an antiferromagnetic state below 13 K followed by a state with a net magnetization and ferromagnetic-like hysteresis below 5 K. Angle-resolved photoemission experiments and density-functional calculations reveal a topologically nontrivial surface state on theMnBi4Te7(0001)surface, analogous to the nonmagnetic parent compoundBi2Te3. Our results establishMnBi4Te7as the first band-inverted compound with intrinsic net magnetization providing a versatile platform for the realization of magnetic topological states of matter.
ISSN:2160-3308
DOI:10.1103/PhysRevX.9.041065