Abstract
The magnetic anisotropy of theLa0.75Sm0.25Mn2Si2 compound, whichhas a layered ThCr2Si2-type crystal structure, has been studied using a quasi-single-crystalline sample. It wasfound that the compound possesses a strong uniaxial magnetic anisotropy in bothmagnetically ordered and paramagnetic states. The magnetic anisotropy of the compoundis mainly due to the Mn sublattice anisotropy. In the ferromagnetic state at 180 K,the magnetization process is characterized by the magnetic anisotropy constantK1 = 6 × 106 erg cm−3. In the paramagnetic state, a considerable anisotropy of paramagnetic Curie temperatureΔθp ≈ 35 Kand an appreciable difference between values of the effective magnetic moment measured along thec-axis and in thebasal plane, Δμeff≈0.4 μB per formula unit, has been observed. The natural layered structure of the compound andpartial unquenching of the Mn orbital momentum have been considered as possible reasonsfor the observed strong magnetic anisotropy.
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