Effect of electron irradiation on the structure and properties of the MgB2 superconductor

Effect of Electron Irradiation on Superconductivity in Single Crystals ofBa(Fe1−xRux)Prozorov1, Kończykowski2, Tanatar3 et al. 2014Phys. Rev. X8051213View full textAdd to dashboardCite

“…It is therefore important to compare the effects of irradiation in iron pnictides with an established two-gap s ++ superconductor, M gB 2 . As expected from the Anderson theorem, both low dose [34] and higher dose [35] (comparable to this study) electron irradiations found virtually no change of T c clearly supporting s ++ nature of superconductivity. On the other hand, neutron irradiation M gB 2 led to a complete suppression of T c [36], which prompts the question on the nature of defects produced by neutron irradiation with a possibility of a nuclear transmutation of boron into carbon.…”

“…[34]. As far as electron irradiation is concerned, both low-dose [37] and higher-dose [38] (comparable to this study) electron irradiations found virtually no change of T c in MgB 2 crystals. On the other hand, the irradiation had a dramatic effect on vortex properties converting a Bragg glass to a disordered vortex lattice, increasing H c2 at higher doses of irradiation and enhancing vortex pinning, all of which means that electrons do induce defects in the crystal structure [38].…”

s-wave superconductivity in optimally dopedSrTi1−xNbxO3unveiled by electron irradiation

“…4 shows T c /T c0 as a function of τ imp /k B T c0 (α) for SrTi 0.987 Nb 0.013 O 3 , compared with three other superconductors. These are the conventional superconductor MgB 2 [16], as well as two unconventional superconductors YBa 2 Cu 3 O 7−δ (d-wave) [2] and Sr 2 RuO 4 (p-wave) [5], which are both perovskites like the system under study. In both YBa 2 Cu 3 O 7−δ and Sr 2 RuO 4 , T c is extremely sensitive to the introduction of disorder and superconductivity is completely destroyed when α exceeds a number of the order of unity.…”

“…In YBa 2 Cu 3 O 7−δ , scattering induced by electron irradiation suppressed T c in a manner similar to Zn substitution [4,14,15]. On the other hand, in the s-wave superconductor MgB 2 , superconductivity is robust with respect to electron irradiation [16][17][18]. In present paper, electron irradiation is utilized to investigate the superconducting order parameter in optimally * xiao.lin@espci.fr doped SrTi 1−x Nb x O 3 single-crystals.…”

Metallicity and Superconductivity in Doped Strontium Titanate

“…Furthermore, the composition of 35% 18 O has been identified as a quantum critical point [27]. According to the Tc/Tc0 as a function of α = /τimpkBTc0, which quantifies the pair-breaking rate [119][120][121]123] in SrTi1−xNbxO3 compared with electron-irradiated MgB2 [124], Zn-doped YBCO [125] and slightly-disordered Sr2RuO4 [126]. The top axis shows the residual resistivity ρ0 for SrTi1−xNbxO3.…”