Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.39: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Frustrated magnetism in the Eu-based intermetallic system EuIr2P2 — •Diego Gaspar Franco and Christoph Geibel — Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Deutschland
Frustration in magnetic systems is a topic of strong current interest, since it can result in unusual ground states. The majority of studies on frustration in magnetic systems have been performed on insulating spin systems, while frustrated metallic systems remain largely unexplored. Interesting effects may be expected for the later case from the interplay between itinerant electrons and frustrated magnetic degrees of freedom.
EuIr2P2 was in an early work proposed to order ferromagnetically based on the positive Curie-Weiss temperature, estimated from the high-temperature susceptibility [1]. However, our recent measurements conclusively show that it orders antiferromagnetically at TN1 = 5 K, in spite of the positive Curie-Weiss temperature. Besides there is a second magnetic transition at TN2 = 3 K. The size of the specific heat anomaly at TN1 is small compared to other S=7/2 systems. Furthermore we observe a large tail in the specific heat above TN1 indicative of strong magnetic fluctuations. These effects point to a magnetic structure with a significant degree of frustration due to different competing magnetic interactions.
C. Lux, et al., J. Alloys and Comp. 200 (1993) 135