Abstract
Abstract Single-crystal X-ray diffraction has shown that (SmS)1.19TaS2 is a misfit layer compound built alternately of double layers of SmS, an approximately {100} slice of NaCl-type SmS and sandwiches of TaS2 with tantalum in slightly distorted trigonal prisms of sulfur. The two structural units are both described in the orthorhombic space group Fm2m, a 1 = 5.552(3) A , b 1 = 5.679(4) A , c 1 = 22.50(4) A , Z = 8 for the SmS part and a 2 = 3.293(1) A , b 2 = 5.679(4) A , c 2 = 22.50(4) A , Z = 4 for the TaS2 part. Corresponding axes are parallel and the layer stacking direction is c. The composition is determined by the ratio a 1 a 2 and the number of formula units in each cell. Sm-S distances in the SmS double layer are close to those in SmS in the metallic high-pressure form with the scheme Sm3+ (e−)S2−. The electrical transport properties are in agreement with an almost filled 5dz2 band of the TaS2 part of the structure, indicating electron donation from the SmS to the TaS2 part. The magnetic susceptibility χ does not follow a Curie-Weiss law; χ−1 goes to zero with decreasing temperature after a small discontinuous drop at about 50 K.
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