SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Weyl Semimetals
MA 39.2: Vortrag
Donnerstag, 30. März 2023, 11:45–12:00, HSZ 403
Pressure induced ferromagnetic collapse and valence instability in EuB6 — •Leonardo Kutelak1, Raimunda Sereika2, Gilberto Fabbris3, Gustavo Lombardi1, Daniel Haskel3, Narcizo Souza Neto1, Priscila Rosa4, Wenli Bi2, and Ricardo Reis1 — 1Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM),Campinas, Sao Paulo, Brazil — 2University of Alabama at Birmingham - Birmingham, AL 87545, USA — 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA — 4Los Alamos National Laboratory - Los Alamos, NM 87545, USA
The only ferromagnetic rare earth hexaboride, EuB6, presents previously reported interesting behavior such as a two-step magnetic transition below 15 K1 and magnetic polarons up to 40 K!. Most recently, it was proposed that EuB6 may host non-trivial electronic behavior near Fermi surface presenting either Weyl Points or nodal lines depending upon magnetization ordering and direction. We show evidences for EuB6 ferromagnetic collapse above 20 GPa with mean valency increase by X-ray spectroscopy techniques. No signs for structural phase transitions were observed in high pressure X-ray diffraction. This opens up new possibilities for fine tuning topological properties utilizing pressure in rare earth hexaborides.
1Süllow, Structure, et al. Physical Review B 57.10 (1998): 5860. 2Pohlit, Merlin, et al Physical review letters 120.25 (2018): 257201. 3Nie, Simin, et al. Physical Review Letters 124.7 (2020): 076403.