Fermi Arcs in an Antiferromagnet detected at BESSY II
Date:
March 23, 2022
Source:
Helmholtz-Zentrum Berlin fu"r Materialien und Energie
Summary:
Researchers have analyzed samples of NdBi crystals which display
interesting magnetic properties. In their experiments including
measurements at BESSY II they could find evidence for so called
Fermi arcs in the antiferromagnetic state of the sample at low
temperatures.
This observation is not yet explained by existing theoretical
ideas and opens up exciting possibilities to make use of these
kind of materials for innovative information technologies based
on the electron spin rather than the charge.
FULL STORY ========================================================================== Reseachers have analysed samples of NdBi crystals which display
interesting magnetic properties. In their experiments including
measurements at BESSY II they could find evidence for so called Fermi arcs
in the antiferromagnetic state of the sample at low temperatures. This observation is not yet explained by existing theoretical ideas and opens
up exciting possibilities to make use of these kind of materials for
innovative information technologies based on the electron spin rather
than the charge.
========================================================================== Neodymium-Bismuth crystals belong to the wide range of materials with interesting magnetic properties. The Fermi surface which is measured
in the experiments contains information on the transport properties of
charge carriers in the crystal. While usually the Fermi surface consists
of closed contours, disconnected sections known as Fermi arcs are very
rare and can be signatures of unusual electronic states.
Unusual magnetic splittings In a study, published now in Nature, the
team presents experimental evidence for such Fermi arcs. They observed an unusual magnetic splitting in the antiferromagnetic state of the samples
below a temperature of 24 Kelvin (the Ne'el-temperature). This splitting creates bands of opposing curvature, which changes with temperature
together with the antiferromagnetic order.
These findings are very important because they are fundamentally different
from previously theoretically considered and experimentally reported
cases of magnetic splittings. In the case of well-known Zeeman and Rashba splittings, the curvature of the bands is always preserved. Since both splittings are important for spintronics, these new findings could lead
to novel applications, especially as the focus of spintronics research
is currently moving from traditional ferromagnetic to antiferromagnetic materials.
========================================================================== Story Source: Materials provided by Helmholtz-Zentrum_Berlin_fu"r_Materialien_und_Energie.
Note: Content may be edited for style and length.
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* The_Fermi_surface_of_antiferromagnetic_NdBi ========================================================================== Journal Reference:
1. Benjamin Schrunk, Yevhen Kushnirenko, Brinda Kuthanazhi, Junyeong
Ahn,
Lin-Lin Wang, Evan O'Leary, Kyungchan Lee, Andrew Eaton,
Alexander Fedorov, Rui Lou, Vladimir Voroshnin, Oliver J. Clark,
Jamie Sa'nchez- Barriga, Sergey L. Bud'ko, Robert-Jan Slager,
Paul C. Canfield, Adam Kaminski. Emergence of Fermi arcs due to
magnetic splitting in an antiferromagnet. Nature, 2022; 603 (7902):
610 DOI: 10.1038/s41586-022- 04412-x ==========================================================================
Link to news story:
https://www.sciencedaily.com/releases/2022/03/220323125126.htm
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