Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr

We present the evolution of the electronic structure of CrSBr from its antiferromagnetic ground state to the paramagnetic phase above T N  = 132 K, in both experiment and theory. Low-temperature angle-resolved photoemission spectroscopy (ARPES) results are obtained using a novel method to overcome s...

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Bibliographic Details
Published in:NPJ 2D materials and applications 2024-08, Vol.8 (1), p.54-8, Article 54
Main Authors: Watson, Matthew D., Acharya, Swagata, Nunn, James E., Nagireddy, Laxman, Pashov, Dimitar, Rösner, Malte, van Schilfgaarde, Mark, Wilson, Neil R., Cacho, Cephise
Format: Article
Language:English
Subjects:
639/766/119/2793
639/766/119/995
Antiferromagnetism
ARPES
Band theory
Banded structure
Chemistry and Materials Science
Electronic structure
Electrons
exchange splitting
Exchanging
Gold
Ground state
Low temperature
MATERIALS SCIENCE
Nanotechnology
Optical properties
Photoelectric emission
Semiconductors
Single crystals
Spectrum analysis
Splitting
Surfaces and Interfaces
Temperature
Thin Films
Valence band
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Summary:We present the evolution of the electronic structure of CrSBr from its antiferromagnetic ground state to the paramagnetic phase above T N  = 132 K, in both experiment and theory. Low-temperature angle-resolved photoemission spectroscopy (ARPES) results are obtained using a novel method to overcome sample charging issues, revealing quasi-2D valence bands in the ground state. The results are very well reproduced by our QSG W ̂ calculations, which further identify certain bands at the X points to be exchange-split pairs of states with mainly Br and S character. By tracing band positions as a function of temperature, we show the splitting disappears above T N . The energy splitting is interpreted as an effective exchange splitting in individual layers in which the Cr moments all align, within the so-called A-type antiferromagnetic arrangement. Our results lay firm foundations for the interpretation of the many other intriguing physical and optical properties of CrSBr.
ISSN:2397-7132
2397-7132
DOI:10.1038/s41699-024-00492-7