• Fermi Arcs in an Antiferromagnet detecte

    From ScienceDaily@1:317/3 to All on Wed Mar 23 22:30:46 2022
    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.


    ========================================================================== Related Multimedia:
    * 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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