Role of magnetic dopants in the phase diagram of Sm1111 pnictides: The Mn case
arXiv:1612.00952 · doi:10.1103/PhysRevB.94.214517
Abstract
The deliberate insertion of magnetic Mn dopants in the Fe sites of the optimally-doped SmFeAsO0.88-F0.12 iron-based superconductor can modify in a controlled way its electronic properties. The resulting phase diagram was investigated across a wide range of manganese contents (x) by means of muon-spin spectroscopy (muSR), both in zero- and in transverse fields, respectively, to probe the magnetic and the superconducting order. The pure superconducting phase (at x < 0.03) is replaced by a crossover region at intermediate Mn values (0.03 =< x < 0.08), where superconductivity coexists with static magnetic order. After completely suppressing superconductivity for x = 0.08, a further increase in Mn content reinforces the natural tendency towards antiferromagnetic correlations among the magnetic Mn ions. The sharp drop of Tc and the induced magnetic order in the presence of magnetic disorder/dopants, such as Mn, are both consistent with a recent theoretical model of unconventional superconductors [M. Gastiasoro et al., ArXiv 1606.09495], which includes correlation-enhanced RKKY-couplings between the impurity moments.
10 pages, 13 figures. Accepted on Physical Review B
References in corpus (13)
- Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation
- Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
- Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsOF measured by muon spin rotation
- Muon-spin rotation studies of SmFeAsO_0.85 and NdFeAsO_0.85 superconductors
- Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2
- Magnetic-superconducting phase boundary of SmFeAsOF studied via muon spin rotation: Unified behavior in a pnictide family
- Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
- Unconventional disorder effects in correlated superconductors
- Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
- Nanoscopic coexistence of magnetic and superconducting states within the FeAs layers of CeFeAsO1-xFx
- Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO
- Intrinsic ferromagnetic impurity phases in SmFeAsO1-xFx detected by muSR
- Crossover between magnetism and superconductivity in low H-doped LaFeAsO