Synthesis\nand Properties of SmO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub> and\nEnhancement in <i>T</i><sub>c</sub> in La<sub>1–<i>y</i></sub>Sm<sub><i>y</i></sub>O<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub>
GohilSingh Thakur (1680913)Ganesan Kalai Selvan (1680904)Zeba Haque (1680901)Laxmi Chand Gupta (1680907)SarojLochan Samal (1680919)Sonachalam Arumugam (1680910)Ashok Kumar Ganguli (1680916)
Abstract
The crystal structure and properties\nof a new member of the oxybismuth\nsulfide family SmO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub> are\nreported here. The compounds SmO<sub>1–<i>x</i></sub>F<sub><i>x</i></sub>BiS<sub>2</sub> (<i>x</i> = 0.0 and 0.5) are isostructural with LaOBiS<sub>2</sub> and crystallize\nin the CeOBiS<sub>2</sub>-type structure (<i>P</i>4/<i>nmm</i>). Sm substitution in LaO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub> (La<sub>1–<i>y</i></sub>Sm<sub><i>y</i></sub>O<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub>) leads\nto a gradual decrease in the <i>a</i>-lattice constant;\nhowever, the <i>c</i>-lattice constant does not show such\na gradual trend. Enhancement in <i>T</i><sub>c</sub> is\nachieved upon partial substitution of La by the smaller Sm ion. A\nmaximum <i>T</i><sub>c</sub> ∼ 4.6 K was observed\nfor composition with <i>y</i> = 0.8. Disobeying this trend, <i>T</i><sub>c</sub> disappears unexpectedly in the composition\nSmO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub> (<i>y</i> = 1.0). Both the undoped and F-doped (<i>x</i> = 0.0 and\n0.5) compounds are paramagnetic, exhibiting semiconducting behavior\ndown to 2 K.
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