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TT: Fachverband Tiefe Temperaturen

TT 26: Correlated Magnetism – Frustrated Systems

TT 26.8: Vortrag

Mittwoch, 19. März 2025, 11:30–11:45, H33

Magnetic Frustration and Weak Mn Magnetic Ordering in EuMn₂P₂ — Sarah Krebber¹, Marvin Kopp¹, Jens Müller¹, Jörg Sichelschmidt², Michael Baenitz², Kurt Kummer³, Cornelius Krellner¹, and •Kristin Kliemt¹ — ¹Physikalische Institut, Goethe Universität Frankfurt, Deutschland — ²Max-Planck-Insitut für Chemische Physik fester Stoffe, 01187 Dresden, Deutschland — ³European Synchrotron Radiation Facility, 38043 Grenoble, France

EuMn₂P₂ is a member of the Eu-based 122-systems with a trigonal CaAl₂Si₂ crystal structure. The magnetic properties of the Eu ion in this compound are located in triangular layers of Eu²⁺. Several quantaties indicated the presence of A-type antiferromagnetic Eu order at ≈ 18 K, with magnetic moments oriented in the a-a plane. Nevertheless, no magnetic order of Mn was observed [1,2]. This is intriguing, given that the analogous compounds EuMn₂As₂ and EuMn₂Sb₂ exhibit phase transitions attributed to Mn magnetic order at elevated temperatures (T_N = 135 K, T_N = 128 K) [3,4].
In this study, we present the results of electron spin resonance (ESR), heat capacity, magnetization, nuclear magnetic resonance (NMR) and electrical resistivity measurements on EuMn₂P₂ single crystals, which exhibite a weak magnetic ordering attributed to Mn magnetism.

[1] A. Payne et al., J. Solid State Chem. 163, 2 (2002);
[2] T. Berry et al., J. Am. Chem. Soc. 145, 8 (2023);
[3] V. K. Anand et al., Phys. Rev. B 94, 014431 (2016);
[4] I. Schellenberg et al., ZAAC 636, 85 (2010).

Keywords: 3d and 4f magnetism