Effect of Zn impurity in K0.8Fe(2-δ-x)Zn(x)Se2
1Department of Physics and State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China.
Abstract:
A series of K(0.8)Fe(2-δ-x)Zn(x)Se(2) single-crystal samples with nominal compositions 0 ≤ x ≤ 0.05 were grown and their physical properties were measured in order to study the effect of Zn impurity. It is found that the Zn impurity (x ≤ 0.02) does not affect the superconducting transition temperature T(c) significantly. Meanwhile the hump in resistivity which corresponds to the transition from the insulating to metallic phase quickly shifts towards low temperatures. The results imply that there should be a phase separation in this system and Zn impurity causes the enhancement of the insulating phase. The negligible effect of Zn impurity on T(c) suggests an s-wave pairing in the superconducting phase. Meanwhile there is a possibility that the Zn impurity may selectively enter into the insulting phase.
Related Concept Videos
Trends in Lattice Energy: Ion Size and Charge
Imperfections in Crystal Structure: Stoichiometric Point Defects
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Solubility Equilibria
The...
Imperfections in Crystal Structure: Non-Stoichiometric Defects
Types of Semiconductors


