Improvement of superconducting properties by chemical pressure effect in Eu-doped La2-xEuxO2Bi3Ag0.6Sn0.4S6
arXiv:1908.09311 · doi:10.1016/j.physc.2020.1353731
Abstract
We have investigated the substitution effect of Eu on the superconductivity in La2-xEuxO2Bi3Ag0.6Sn0.4S6. Recently, we reported an observation of superconductivity at 0.5 K in a layered oxychalcogenide La2O2Bi3AgS6. The Sn doping at the Ag site was found to raise the superconducting transition temperature, Tc to 2.5 K in La2O2Bi3Ag0.6Sn0.4S6. To further improve the superconducting properties, we have partially substituted Eu for the La site to increase the chemical pressure in La2-xEuxO2Bi3Ag0.6Sn0.4S6 (x = 0.1 to 0.6). With the increase in Eu concentration, x, the lattice constant a was found to shrink, while the lattice constant c was marginally shortened, which suggests that the chemical pressure induced by the Eu doping is uniaxial along the a-axis. Tc was observed to increase with increasing x up to x = 0.4, further decreasing for higher Eu concentrations of x = 0.5 and 0.6. From the magnetic susceptibility and resistivity measurements, the bulk nature of superconductivity has been observed for x = 0.1 to 0.5 with Tc = 2.5 to 4.0 K, respectively. The upper critical field (Bc2) was noted to be 3.5 T for x = 0.4, which also has the highest Tc.
arXiv comment14 pages, 8 figures, 1 table
References in corpus (26)
- Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
- Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeOFBiS
- Superconductivity of F-substituted LnOBiS2 (Ln = La, Ce, Pr, Nd, Yb) compounds
- Superconductivity induced by La doping in Sr1-xLaxFBiS2 system
- Pressure Study of BiS2-Based Superconductors Bi4O4S3 and La(O,F)BiS2
- Superconductivity induced by electron doping in the system La1-xMxOBiS2 (M = Ti, Zr, Hf, Th)
- A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
- In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure
- Appearance of superconductivity in new BiS2 based layered LaO0.5F0.5BiS2
- Pressure-induced enhancement of superconductivity and suppression of semiconducting behavior in Ln(O0.5F0.5)BiS2 (Ln = La, Ce) compounds
- Material Development and Physical Properties of BiS2-Based Layered Compounds
- Superconductivity in a new layered bismuth oxyselenide: LaO0.5F0.5BiSe2
- Enhancement of thermoelectric properties by Se substitution in layered bismuth-chalcogenide LaOBiS2-xSex
- Correlation between crystal structure and superconductivity in LaO0.5F0.5BiS2
- Appearance of bulk Superconductivity under Hydrostatic Pressure in Sr0.5RE0.5FBiS2 (RE = Ce, Nd, Pr and Sm) compounds
- Impact of hydrostatic pressure on superconductivity of Sr0.5La0.5FBiS2
- Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS2-Based REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd)
- Chemical pressure effect on superconductivity of BiS2-based Ce1-xNdxO1-yFyBiS2 and Nd1-zSmzO1-yFyBiS2
- Effect of yttrium substitution on the superconducting properties of the system LaYOFBiS
- Crystal structure, site selectivity, and electronic structure of layered chalcogenide LaOBiPbS3
- Superconductivity in layered Oxychalcogenide La2O2Bi3AgS6
- Electronic and magnetic properties of superconducting LnOFBiS (Ln = La, Ce, Pr, and Nd) from first principles
- Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6
- First-principles study of LaOPbBiS and its analogous compounds as thermoelectric materials
- Low Curie-temperature ferromagnetic phase in SmPt2Cd20 possibly accompanied by strong quantum fluctuations
- Bulk superconductivity in La2O2M4S6-type layered oxychalcogenide La2O2Bi3Ag0.6Sn0.4S5.7Se0.3