Interplane resistivity of isovalent doped BaFe2(As1−xPx

Abstract

Temperature-dependent inter-plane resistivity, ρc(T ), was measured for the iron-based superconductor BaFe2(As1−xPx)2 over a broad isoelectron phosphorus substitution range from x=0 to x=0.60, from non-superconducting parent compound to heavily overdoped superconducting composition with Tc ≈ 10 K. The features due to structural and magnetic transitions are clearly resolved in ρc(T ) of the underdoped crystals. A characteristic maximum in ρc(T ), found in the parent BaFe2As2 at around 200 K, moves rapidly with phosphorus substitution to high temperatures. At the optimal doping, the inter-plane resistivity shows T -linear temperature dependence without any cross-over anomalies, similar to the previously reported in-plane resistivity. This observation is in stark contrast with dissimilar temperature dependences found at optimal doping in electrondoped Ba(Fe1−xCox)2As2. Our finding suggests that despite similar values of the resistivity and its anisotropy, the temperature dependent transport in the normal state is very different in electron and isoelectron doped compounds. Similar temperature dependence of both in-plane and inter-plane resistivities, in which the dominant contributions are coming from different parts of the Fermi surface, suggests that scattering is the same on the whole Fermi surface. Since magnetic fluctuations are expected to be much stronger on the quasi-nested sheets, this observation may point to the importance of the inter-orbital scattering between different sheets.

Tunnel-diode resonator and nuclear magnetic resonance studies of low-dimensional magnetic and superconducting systems

“…The value of ρ(300K) was about 300 µΩ · cm, close to a value found in BaP122. [158]. Samples show very close to perfect T -linear temperature dependence, which is similar to the dependence found in BaP122 at optimal doping, both for in-plane [137] and inter-plane [158] transport.…”

“…[158]. Samples show very close to perfect T -linear temperature dependence, which is similar to the dependence found in BaP122 at optimal doping, both for in-plane [137] and inter-plane [158] transport. The resistive transition is rather sharp, ∆T c ∼ 2 K, and its end point at 25 K is close to an onset of a sharp frequency shift in zero-field TDR experiments.…”

Nodal superconductivity in isovalently substituted SrFe2(As1−xPxMurphy1, Strehlow2, Cho3 et al. 2013Phys. Rev. BSelf Cite239160View full textAdd to dashboardCite

“…inset shows the data zoomed in the vicinity of T c . Overall, the resistivity curves for SrP122 and BaP122 are virtually the same showing clear deviation from the Fermi liquid T 2 dependence at all temperatures, indicating proximity to the quantum critical point at the optimal doping [18,31,33,[40][41][42]. Figure 2 shows the low temperature behavior of the penetration depth for three samples of SrFe 2 (As 1−x P x ) 2 .…”

Effects of isovalent substitution and pressure on the interplane resistivity of single-crystalBa(Fe1−xRux)2Tanatar1, Torikachvili2, Thaler3 et al. 2014Phys. Rev. BSelf Cite

“…Here resistivity for both in-plane, ρ a , and inter-plane, ρ c , current directions reveals extended range of T -linear dependence at optimal doping 6,7 , and signatures of the quantum critical point are found in both normal and superconducting state properties 6,8,9 . Much more complex evolutions of in-plane and inter-plane resistivity are found in electron-doped Ba(Fe 1−x Co x ) 2 As 2 10-12 and hole-doped Ba 1−x K x Fe 2 As 2 13 .…”