Enhancement of superconductivity inLa1−xSmxO0.5F0.5BiS

Abstract

The superconducting and normal-state properties of La1−xSmxO0.5F0.5BiS2 (0.1 x 0.9) have been studied via electrical resistivity, magnetic susceptibility, and specific heat measurements. By using suitable synthesis conditions, Sm exhibits considerable solubility into the CeOBiS2-type LaO0.5F0.5BiS2 lattice. In addition to a considerable enhancement of the superconducting volume fraction, it is found that the superconducting transition temperature Tc is dramatically enhanced with increasing Sm concentration to 5.4 K at x = 0.8. These results suggest that Tc for SmO0.5F0.5BiS2 could be as high as ∼6.2 K and comparably high Tc values might also be obtained in the compounds LnO0.5F0.5BiS2 (Ln = Eu -Tm) if they can be synthesized.

Evolution of Superconductivity in BiS2-Based Superconductor LaO0.5F0.5Bi(S1−xSex)2

“…Furthermore, several high-pressure studies revealed that superconducting properties are sensitive to changes in local crystal structures: the T c can be enhanced by optimal lattice contraction [20][21][22][23][24][25][26][27]. In addition, it was reported that the [31]. These experimental results suggest that the intrinsic (bulk and higher T c ) superconductivity could be induced by optimizing crystal structures in the BiS 2 -based family.…”

Coexistence of superconductivity and ferromagnetism in Sr0.5Ce0.5FBiS2-xSex (x = 0.5 and 1.0), a non-U material with Tc < TFM

“…Structurally, these materials are quite similar to high- T c cuprates and iron pnictides and superconductivity is quite robust as evident from numerous studies on various site substitutions24303132. T c is enhanced in LnO 1- x F x BiS 2 by chemical pressure via partial or complete substitution of La by a smaller rare-earth (Ln = Ce, Pr, Nd, Sm and Yb)2333343536. YbO 0.5 F 0.5 BiS 2 has the highest T c  = 5.4 K among LnO 1- x F x BiS 2 and, interestingly, it undergoes an antiferromagnetic transition (T N  ~ 2.7 K) also23.…”

Hydrostatic-pressure effects on the pseudogap in slightly doped YBa2Cu3O7−δ single crystals

“…However, the details of the BEC-BCS transition are not fully clear so far as well [2,20,21,26,31]. Pressure is a powerful tool for studying various properties of the cuprates [32][33][34][35][36][37][38] and it is widely used in experiments since the discovery of HTSCs [39] till present days [40]. Pressure noticeably affects T c and the resistance of HTSCs in the normal state.…”