Role of in-plane and out-of-plane dilution in CeFeAsO: Charge doping versus disorder

Abstract

We provide direct experimental evidence for the identical effect of the in-plane Fe1−xCox and of the out-of-plane O1−xFx chemical dilution on the itinerant spin-density-wave (SDW) magnetic phase in CeFeAsO. Remarkably, the suppression of SDW is not sensitive at all to the different kinds of disorder introduced in the two cases. Still, it is clearly shown that the sizable in-plane disorder induced by the Fe1−xCox substitution is highly effective in suppressing Tc. Differently from what is observed in CeFeAsO1−xFx, the ordered magnetic phase of the Ce sublattice is preserved throughout the whole phase diagram in CeFe1−xCoxAsO (x⩽0.2). An intriguing effect is encountered, whereby the magnetic coupling among Ce3+ ions is enhanced by the superconducting phase

Competing superconducting and magnetic order parameters and field-induced magnetism in electron-dopedBa(Fe1−xCox)2As2Larsen1, Uranga2, Stieber3 et al. 2015Phys. Rev. B101100View full textAdd to dashboardCite

“…The emergence of a coexistence region of static magnetic and superconducting order at intermediate doping levels depends on the particular material; whereas the 122 systems and most of the 1111 compounds exhibit a coexistence region at the foot of the magnetic dome [4], this is not the case for La-1111, for example [5][6][7].…”

A view from inside iron-based superconductors

“…The results of the calculations yield N = 2 stable minima in addition to a further site which, however, is unstable against the zero-point motion of µ + . In Experimental spin-depolarization at low-T in ZF conditions for CeFe 1−x Co x AsO in the low-x region of the electronic phase diagram [55]. The strong increase of the transversal damping with increasing x is the experimental trademark of the progressive disordering of the magnetic phase towards the limit of short-range magnetic order coexisting with superconductivity.…”

Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors

“…In the cuprates and in the electron-doped iron-based superconductors (IBS) the strength of the electronic correlations can be tuned either by charge doping or by applying an external or a chemical pressure. [10][11][12][13][14] In particular, upon increasing the charge doping, the strength of the electronic correlations tend to decrease [15][16][17][18][19][20][21][22] and a metallic Fermi liquid (FL) ground state is usually restored [23][24][25][26][27]. However significant electronic correlations may still be present even close to the charge doping levels yielding the maximum superconducting transition temperature T c and a convenient method to test their magnitude is to perturb the system with impurities.…”