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MA: Fachverband Magnetismus

MA 44: Frustrated Magnets II

MA 44.6: Vortrag

Donnerstag, 30. März 2023, 16:30–16:45, HSZ 403

Non-collinear magnetism and Fe-R interaction in R₃Fe₃Sb₇ — •Felix Seewald¹, Falk Pabst^2,5, Sabrina Palazzese^1,3,5, Vadim Grinenkov^1,6, Hubertus Luetkens⁷, Thomas Herrmannsdörfer³, Shingo Yamamoto^3,5, Denis Gorbunov^3,5, Sumanta Chattopadhyay^3,5, Clemens Ritter⁴, Kati Finzel², Thomas Doert^2,5, Michael Ruck^2,5, Jochen Wosnitza^1,3,5, and Hans-Henning Klauss¹ — ¹IFMP, TU Dresden, Germany — ²Fakultät für Chemie und Lebensmittelchemie, TU Dresden, Germany — ³HLD-EMFL, Helmholtz-Zentrum Dresden-Rossendorf, Germany — ⁴Institute Laue-Langevin Grenoble, France — ⁵Würzburg-Dresden Cluster of Excellence ct.qmat — ⁶Tsung-Dao Lee Institute, Shanghai, China — ⁷PSI, Villingen, Switzerland

In R₃Fe₃Sb₇ (R = Pr, Nd) Fe and R atoms form columns of stacked triangles separated by Sb. Fe exhibits non-collinear ferromagnetic order below T_c ≈ 380 K. On cooling at the onset of R order a spin reorientation (T_SRT,Pr ≈ 40 K, T_SRT,Nd ≈ 50 K) and magnetization reversal is observed [1].

Mössbauer spectra show two distinct magnetic Fe sites between T_c and T_SRT, both collapsing into one new site below T_SRT, reaching a static magnetic hyperfine-field of B_Hyp = 20.59(21) T at 4.2 K. The data is the same for Nd and Pr except for the value of T_SRT. The local field obtained from µSR investigations is consistent with Mössbauer hyperfine-field at high temperatures. We will discuss the implications of our findings on the magnetic structure of the system.
[1] Falk Pabst, Sabrina Palazzese et. al., Advanced materials, accepted