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Polycrystalline samples of SmIr2Si2 formed at room temperature both the lowtemperature phase (LTP) and the metastable high temperature phase (HTP),respectively, depending on the heat treatment. The samples were studied byX-ray powder diffraction, DTA, specific-heat and magnetization measurementswith respect to temperature and magnetic field. The first order LTP to HTPpolymorphic phase transition has been determined showing the huge temperaturehysteresis of 264{\deg}C caused by the high energy barrier due to the change ofstacking of Sm, Ir and Si basal plane sheets within the transition. Bothpolymorphs show indications of antiferromagnetic order at low temperatures. Theconsiderably different magnetic phase transitions determined for the LTP andHTP confirm the strong influence of crystal structure symmetry on magnetism inthe two polymorphs. The magnetism in SmIr2Si2 exhibits typical features causedby the specific behavior of Sm3+ ion characterized by energy nearness of theground state and first excited state and crystal field influence.Interpretation of experimental results is corroborated by results of ab initioelectronic structure calculations.

Influence of symmetry on Sm magnetism studied on SmIr2Si2 polymorphs