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Thakur, Gohil Singh; Selvan, Ganesan Kalai; Haque, Zeba; Gupta, Laxmi Chand; Samal, Saroj Lochan; Arumugam, Sonachalam; Ganguli, Ashok Kumar
Inorganic chemistry, 02/2015, Volume: 54, Issue: 3Journal Article
The crystal structure and properties of a new member of the oxybismuth sulfide family SmO0.5F0.5BiS2 are reported here. The compounds SmO1–x F x BiS2 (x = 0.0 and 0.5) are isostructural with LaOBiS2 and crystallize in the CeOBiS2-type structure (P4/nmm). Sm substitution in LaO0.5F0.5BiS2 (La1–y Sm y O0.5F0.5BiS2) leads to a gradual decrease in the a-lattice constant; however, the c-lattice constant does not show such a gradual trend. Enhancement in T c is achieved upon partial substitution of La by the smaller Sm ion. A maximum T c ∼ 4.6 K was observed for composition with y = 0.8. Disobeying this trend, T c disappears unexpectedly in the composition SmO0.5F0.5BiS2 (y = 1.0). Both the undoped and F-doped (x = 0.0 and 0.5) compounds are paramagnetic, exhibiting semiconducting behavior down to 2 K.
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