Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 71: Correlated Electrons: Poster Session
TT 71.9: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
Electronic and magnetic structure of RENi2Mnx-compounds (RE = rare earth, x = 0, 0.25, 0.5, 0.75, 1, 1.25) with respect to ErNi2Mnx — •Kamil Balinski1, Artur Chrobak3, T.V. Kuznetzsova2, N.V. Mushnikov2, V.V. Marchenkov2, and Karsten Küpper1 — 1Department of Physics, Osnabrück University, Germany — 2Institute of Metal Physics, 620990 Ekaterinburg, Russia — 3Department of Physics, University of Silesia in Katowice, Poland
Rare earth (RE) and transition metal (T) compounds are research field since the 1960s. Because of huge magnetocalorical effect and giant magnetostriction the RE-T-compounds are excellent for applications like magnetic cooling or hydrogen storage devices. Besides of that RE-Ni2-type of alloys are, due to the relatively simple crystal structure and the fact that Ni2 does not indicate any magnetic moment, excellent candidates for studies of magnetic behavior of RE’s and their binding partners. The electronic structure of ErNi2Mnx (x = 0, 0.25, 0.5, 0.75, 1, 1.25) is characterized by XPS and ResPES, the magnetic structure is investigated by SQUID and PPMS techniques, and resistivity measurements are made. Variation in Mn concentration revealed the position of Mn 3d-states at 1.7 eV. The XPS intensity at 1.7 eV can be correlated with the behavior of the Curie temperature and the resistivity. While similar RENi2Mnx-systems, where RE had been replaced by Gd and Tb, highest resistivity, Curie temperature and the highest Mn 3d-valence band state intensity were observed at x = 0.5. ErNi2Mnx-system behave different and show the mentioned maxima at x = 1.25.