Magnetoelastically coupled structural, magnetic, and superconducting order parameters in BaFe2(As1−xP<

Dynamic competition between spin-density wave order and superconductivity in underdoped Ba1−xKxFe2As2

“…Furthermore, in a systematic study in the BaFe 2 (As 1 À x P x ) 2 system, it is shown that the mechanical detwinning stress increases T SDW and decreases T C (ref. 23). In the current study, we do not observe any significant modification of T SDW and T C within experimental uncertainties inferred from the temperatures at which spectral features associated with these orders onset compared with those measured on unstressed crystals.…”

In-plane uniaxial stress effects on the structural and electronic properties of BaFe2As2and CaFe2AsTomić1, Jeschke2, Fernandes3 et al. 2013Phys. Rev. B285231View full textAdd to dashboardCite

“…6 also found an enhancement of the magnetic transition temperature T N in the same detwinned samples. Phenomenological models 14,30,36 attribute this effect to changes in the magnetic fluctuation spectrum of the paramagnetic phase promoted by the uniaxial stress. In this regard, it would be interesting in future ab initio studies to systematically investigate the changes in the nesting feature of the Fermi surface (Fig.…”

Coincident structural and magnetic order inBaFe2(As1−xPx)2revealed by high-resolution ne

“…For x = 0.24 and 0.25 the transitions are slightly broader, though still much sharper than most previous reports for this sample range, indicative of good sample quality. 8,16,20,24 It was shown previously that the anomalous broadening of transitions in this regime originates from enhanced coupling between strain and the superconducting order parameter 19 , though most likely the rapid variation of T c as a function of composition also allows small compositional inhomogeneities to be observed as a broadened transition. Nevertheless, even for such closely spaced compositions, the curves for x = 0.24 and 0.25 are sufficiently well spaced to indicate that they are of distinguishable composition, and that the samples have a smaller than usual concentration of internal strain inducing defects.…”

“…19,20 Also, while the existing comparisons to mechanical pressure are appealing, they do not factor in how the Fe-P interaction contributes to the overall picture, except to say that it appears to enhance the features in the phase diagram more than expected by looking solely at the Fe-As bond. Given the sensitivity of the family to subtle changes in the bond geometry, the fact that there are two fundamentally different types of bonds randomly distributed throughout the material-unlike the mechanically strained system where the (Fe 2 As 2 ) layer remains intact, structurally-suggests that in order to truly understand the system, one must develop a framework for understanding the Fe-P interaction as a function of doping.…”