Add time:08/26/2019         Source:sciencedirect.com

Temperature dependences of heat capacity CP(T) and lattice parameters a(T), b(T), c(T) of thulium carboboride TmB2C at 2–300 K were experimentally studied. Magnetic phase transition in the carboboride – ‘paramagnetic – antiferromagnetic’ at TN = 11.0 K was revealed. By comparison with the diamagnetic LuB2C the Schottky contribution to TmB2C heat capacity due to the crystal electric field (CEF) was calculated. The splitting scheme of Tm3+ ion f – level by the crystal field was suggested.It was obtained that in the temperature range under study (5–300 K) TmB2C carboboride thermal expansion in the basal plane is almost missing (anisotropic invar effect, linear thermal expansion coefficient αa(T) ≃ αb(T) ≃ 0). It is, seems, a common property of the lattice dynamics of layered carboborides. The anomalies in the thulium carboboride thermal expansion are due to the magnetic phase transition and the CEF influence.

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