Magnetic phase diagram of non-centrosymmetric Eu2Pd2Sn

The magnetic phase diagram of Eu2Pd2Sn is constructed after magnetic, thermal and transport measurements. This compound crystallizes in the achiral and non-centrosymmetric Ca2Pd2Ge-type structure, where 1st Eu2+ magnetic neighbors are disposed in zig-zag chains which form puckered quasi hexagons with respective 2nd Eu2+ neighbors.
From high temperature magnetic susceptibility (T>50K) an effective magnetic moment μeff =7.87μB is obtained, very close to the expected 7.94μB for Eu2+ and a Curie-Weiss paramagnetic temperature θP =19K. Although a cusp in (T) at TN ~ 13 K indicates antiferromagnetic character, the positive θP > 0 and observed magnetic field B dependencies reveal the presence of a complex structure. Specific heat Cp(T) shows a Ʌ-type transition at TN which practically vanishes above B~1T. On the contrary, a broad anomaly at around 10 K, which characterizes modulated magnetic order parameters, narrows significantly at B~1T approaching a magnetic critical point. By increasing B below 10K, two step changes in magnetization and magnetoresistance reveal exotic modifications in the magnetic structure between 1 and 2T. After its struc-tural topology and the morphology of the phase diagram, Eu2Pd2Sn appears as a good candidate for the formation of skyrmion quasiparticles.
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