Superconductivity Induced by Phosphorus Doping and Its Coexistence with Ferromagnetism inEuFe2(As0.7P0.3)2

Abstract

We have studied EuFe2(As0.7P0.3)2 by the measurements of x-ray diffraction, electrical resistivity, thermopower, magnetic susceptibility, magnetoresistance and specific heat. Partial substitution of As with P results in the shrinkage of lattice, which generates chemical pressure to the system. It is found that EuFe2(As0.7P0.3)2 undergoes a superconducting transition at 26 K, followed by ferromagnetic ordering of Eu 2+ moments at 20 K. This finding is the first observation of superconductivity stabilized by internal chemical pressure, and supplies a rare example showing coexistence of superconductivity and ferromagnetism in the ferro-arsenide family.

Superconductivity and ferromagnetism in EuFe2(As1−xPx)2

“…In the case of Co doping, however, there was a superconducting transition at ∼21 K, followed by resistivity reentrance around 17 K. [27,28] By P doping at the As-site, we found both SC at T c =26 K and localmoment FM in the Eu sublattice at 20 K in EuFe 2 (As 0.7 P 0.3 ) 2 . [29] In this paper we report schematic investigations on how SC and FM are evolved in EuFe 2 (As 1−x P x ) 2 system, particularly focusing on where and why SC coexists with FM.…”

Fluence-dependent femtosecond quasiparticle and Eu2+ spin relaxation dynamics in EuFe2(As,P)Pogrebna1, Mertelj2, Cao3 et al. 2016Phys. Rev. B1100View full textAdd to dashboardCite

“…In the iron-based superconductors family [1,2] EuFe 2 (As,P) 2 [3] and Eu(Fe,Co) 2 As 2 [4] offer an interesting experimental possibility to study the competition between the ferromagnetic (FM) and superconducting (SC) order parameters that can lead to nonuniform magnetic and SC states [4][5][6][7], since the optimal critical temperature T c ∼ 28 K [8] is comparable to the Eu 2+ spin ordering temperatures T M ∼ 20 K [3,9].…”

Synthesis, Crystal Structure and Superconductivity in RbLn2Fe4As4O2 (Ln = Sm, Tb, Dy, and Ho)

“…Superconductivity is induced by suppressing the SDW ordering via a certain chemical doping that may either introduce additional electrons 4 or holes, 5 or "apply" chemical pressures. 6 Nevertheless, there is an alternative route towards superconductivity as well, namely, the electron (or hole) carriers are introduced by an internal charge transfer in the material itself. Examples include self-electron-doped Sr 2 VFeAsO 3 7 and Ba 2 Ti 2 Fe 2 As 4 O.…”