Resistive upper critical fields and anisotropy of an electron-doped infinite-layer cuprate

Abstract

We report a transport study down to 2 K and in high magnetic fields up to 20 T of a highly c-axis-oriented epitaxial thin film of electron-doped "infinite-layer" cuprate superconductor Sr 1−x La x CuO 2 with T c of 26 K. A 16 T magnetic field perpendicular to the ab plane of the film completely suppresses superconductivity, even at the lowest temperature. Perpendicular magnetic fields shift the resistive transition to lower temperatures, without significant broadening, in a way similar to that seen in conventional superconductors. The upper critical field H c2Ќ ͑T͒ exhibits an almost linear temperature dependence. It is shown that electron-doped infinite-layer cuprate presents three-dimensional superconductivity due to a weaker anisotropy ͑␥ =15͒ and smaller H c2Ќ ͑T͒ values than the ones of hole-doped cuprates.

Classifying superconductivity in an infinite-layer nickelate Nd0.8Sr0.2NiO2

“…This deduced value for (0) is in reasonable agreement with (0) = 4.5 nm reported by Jovanović et al[33] for copper-oxide-based infinite layer counterpart of La1-xSrxCuO2.…”

“…Deduced (0) = 740 ± 3 nm is similar to (0) = 690-850 nm measured for samples possessing maximal Tc values for cuprate counterpart La1-xSrxCuO2 [37]. By utilizing deduced (0) value the Ginzburg-Landau parameter = λ(0) (0) = 130 which is similar to La1-xSrxCuO2 [33,37] and this value is at the upper-level range for other cuprates and unconventional superconductors [15,23,24,26,[38][39][40][41][42][43]. Table I.…”

“…By utilizing deduced (0) value the Ginzburg-Landau parameter 𝜅 = λ(0) 𝜉(0) = 130 which is similar to La1-xSrxCuO2 [33,37] and this value is at the upper-level range for other cuprates and unconventional superconductors [15,23,24,26,[38][39][40][41][42][43].…”

Classifying Superconductivity in an Infinite-Layer Nickelate Nd_0.8Sr_0.2NiO₂

“…By utilizing deduced (0) value the Ginzburg-Landau parameter = λ(0) (0) = 130 which is similar to La1-xSrxCuO2 [33,37] and this value is at the upper-level range for other cuprates and unconventional superconductors [15,23,24,26,[38][39][40][41][42][43]. Table I.…”

Kinetic 2D Crystals via Topochemical Approach

“…The anisotropy ratio of the upper critical magnetic field H c2 is 11.6-13.7, which is quite large comparable to other superconducting materials. [262][263][264][265] Recently, metastable CoCh phase (Ch = S, Se) layers have been reported. [113] CoSe was revealed as a weak itinerant ferromagnet instead of a superconductor at a T c near 10 K, while that of CoS cannot be measured due to the inferior crystallinity during the solvent reaction (Figure 13e).…”