Superconductivity in layered BiS2-based compounds

Abstract

A novel family of superconductors based on BiS 2 -based superconducting layers were discovered in 2012. In short order, other BiS 2 -based superconductors with the same or related crystal structures were discovered with superconducting critical temperatures T c of up to 10 K. Many experimental and theoretical studies have been carried out with the goal of establishing the basic properties of these new materials and understanding the underlying mechanism for superconductivity. In this selective review of the literature, we distill the central discoveries from this extensive body of work, and discuss the results from different types of experiments on these materials within the context of theoretical concepts and models.

Structural Difference in Superconductive and Nonsuperconductive Bi–S Planes within Bi4O4Bi2S4 Blocks

“…Specific heat jump of AP-Bi4O4S3 sample has been reported at 4.4 K, which is an evidence of the bulk superconductivity of Bi4O4S3 phase. 12 The relatively small specific heat jump, which has been also reported on many other BiS2 superconductors 9 , can be explained by a small electronic specific heat coefficient. However, it has been argued that this small specific heat jump can be attributed to a superconductive impurity.…”

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiSFang1, Yazici2, White3 et al. 2015Phys. Rev. BSelf Cite181240View full textAdd to dashboardCite

“…[4][5][6][7][8][9][10][11][12][13][14][15][16] Similar to the cuprate and Febased superconductors, the structure of these compounds is characterized by alternate stacking of superconducting BiS 2 layers and charge-reservoir blocking layers, both of which are tunable by using chemical substitution or applying external pressure. 4,5,11,14,17,18 Therefore, there is plenty of phase space to search for the optimal conditions for superconductivity in this family of compounds.…”

Ce 4f electronic states of CeO1−xFxBiS2 studied by sof

“…CeO 1−x F x BiS 2 is one of the newly discovered superconductors LnO 1−x F x BiS 2 (Ln = La, Ce, Pr, Nd, Yb) [9,10] where the CeO 1−x F x and the BiS 2 layers are stacked alternatively. The latter layer has no metallic d band and it is a narrow-gap semiconductor.…”