Evolution of superconductivity and magnetism in BiS2-based layered compounds

Abstract

BiS 2 -based compounds constitute a new family of layered superconductors. In this article, several experimental findings on the superconductivity and related properties of the BiS 2 family are reviewed. In particular, the focus is on the conditions required for the emergence of superconductivity and higher superconducting transition temperature in the BiS 2 family: it is shown that optimizing the electron doping and crystal structure are important. Further, a few notable characteristics such as the coexistence of superconductivity and magnetism as well as the relation between the superconductivity and chargedensity-wave instability are introduced in brief.

Structural Modulation in LaO0.9F0.1BiSe2 Single Crystals Revealed by Scanning Tunneling Microscopy/Spectroscopy

“…Tc of the sample of x = 0.1 and x = 0.5 were 3.2 K and 3.8 K, respectively. The difference in Tc indicates the difference in the actual amount of F between x = 0.1 and x = 0.5 samples [1]. STM/STS measurements were performed with laboratory-built STM in the He gas at 4.2 K. The clean surface of LaO0.9F0.1BiSe2 single crystal was prepared by cleavage at 4.2 K in situ.…”

“…Enormous attentions have been paid to layered superconductors, such as cuprates and iron-based superconductors because of their high superconducting transition temperature Tc. Newly discovered BiS2-based superconductors LnO1-xFxBiCh2 (Ln = La, Pr, Ce, Nd, Yb and Bi, Ch = S, and Se) also have a layered structure [1]. A lot of BiS2-based superconductors were synthesized with several kinds of Ln or Ch, where the carrier density is controlled by the amount of F.…”

Single Crystal Growth and Superconducting Properties of Antimony-Substituted NdO0.7F0.3BiS2

“…Although a superconducting transition temperature (T c ) of Ln(O,F)BiS 2 is around 4 K, T c is increased when a lattice strain is introduced. One of the ways to introduce the lattice strain is by partial element substitution with a different ionic radius into Ln, Bi, or S site [10][11][12][13][14][15][16]. The strain introduced by partial element substitution in these crystals is the chemical pressure.…”