Enhancement of Tc in BiS2-based superconductors NdO0.7F0.3BiS2 by substitution of Pb for Bi. (December 2015)

• Record Type: Journal Article
• Authors: Demura, S.; Fujisawa, Y.; Otsuki, S.; Ishio, R.; Takano, Y.; Sakata, H.
• Is Part Of: Solid state communications. Volume 223(2015)
• Page Start: 40
• Page End: 44
• Publication Date: 2015-12
• Subjects: A. Superconductivity -- A. BiS2-superconductor -- E. Transport properties -- E. Scanning tunneling spectroscopy (STM); Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2015.09.002
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We succeed in enhancement of a superconducting transition temperature ( T c ) for NdO0.7 F0.3 BiS2 single crystal by partial substitution of Pb for Bi. The T c increases with increasing Pb concentration until 6%. The maximum T c zero is 5.6 K, which is the highest value among BiS2 -based based superconductors synthesized under an ambient pressure. Pb substitution for Bi induces lattice shrinkage along the c -axis. These results reflect that superconductivity in this system is responsive to the lattice strain. Highlights: We synthesized NdO0.7 F0.3 BiS2 single crystals by substitution of Pb for Bi. The superconducting transition temperature increases upon Pb substitution until 6%. The substitution of Pb introduces a lattice shrinkage along c -axis. This results indicate BiS2 -based superconductors are sensitive for a lattice strain.