Fluctuation magnetoconductivity in pristine and protonirradiated Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystals
arXiv:1609.09259 · doi:10.1088/1361-6668/30/2/025009
Abstract
The influence of the proton irradiation on the thermally fluctuation-induced conductivity in Ca8.5La1.5(pt3As8)(Fe2As2)5 single crystal was investigatyed. The in-plane magnetoconductivity was measured up to H=13T. It is observed that the Tc was suppressed up to 30.3 from 32.5 K when the proton is irradiated whereas the amplitude of the fluctuation effect is the almost same in both samples. The results were analyzed by the Ullah and Dorsey scaling functions based on the Hartree approximation to the Ginzburg-Landau free energy, including the critical-fluctuation regime. In the pristine sample, the 3D-2D crossover in the fluctuation effect was observed near the Tc. When the 3D-2D occurs, it is newly found that there is a regime simultaneously described by 2D and 3D fluctuation behaviors. Meanwhile, the proton-irradiated sample showed the 3D fluctuation.
14 pages, 6 figures
References in corpus (9)
- LaFeAsOF: A low carrier density superconductor near itinerant magnetism
- Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
- Is LaOFFeAs an electron-phonon superconductor ?
- Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
- Electronic Structure and Doping in BaFeAs and LiFeAs: Density Functional Calculations
- Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
- Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO
- Upper and lower critical fields in NdFeAs(O,F) single crystals : a study by Hall probe magnetization and specific heat
- The role of different negatively charged layers in Ca10(Fe1-xPtxAs)10(Pt3+yAs8) and superconductivity at 30 K in electron-doped (Ca0.8La0.2)10(FeAs)10(Pt3As8)