Emergence of novel magnetic order at finite temperature in overdoped pnictides

Abstract

We examine the temperature dependence of the magnetic ordering in the frustrated Heisenberg $J_1-J_2$ model in presence of two different kind of dopants: vacancies or magnetic impurities. We demonstrate that, irrespective to their magnetic ratio, the introduction of impurities quenches the order by disorder selection mechanism associated with an Ising-like phase transition at low temperatures and gives way to a $90^{\circ }$ (anticollinear) order . The presence of dopants triggers a non trivial competition between entropically selected states (collinear) and energetically favoured ones (anticollinear) in dependence of both dilution and temperature. While in case of magnetic impurity, the interesting magnetic phases are observed for full range of temperature and doping, in case of nonmagnetic impurities every magnetic order is destroyed at all temperatures above $12\%$ dilution. At fixed low temperature and tuning the doping we show a first order phase transition leading to the re-entrance of the Ising-like order with percolation of islands of $90^{\circ }$ order. At fixed doping and varying the temperature we observe a transition from the anticollinear to the collinear phase assisted by a new emerging magnetic phase in the presence of magnetic impurities, whilst in case of vacancies this transition is characterised by a coexistent region of both. Furthermore, tuning the magnetic moment of the impurities, a complete collapse of the Ising-like order is attained. This is in agreement with observations of Ir dopant atoms in superconducting Ba(Fe${}_{1-x}$Ir${}_x$)${}_2$As${}_2$ with $x<0.047$.

References in corpus (30)

• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• Observation of Dirac Cone Electronic Dispersion in BaFe2As2
• Li${}_2$VO(Si,Ge)O${}_4$, a prototype of a two-dimensional frustrated quantum Heisenberg antiferromagnet
• Orbital Ordering and Unfrustrated $(\pi ,0)$ Magnetism from Degenerate Double Exchange in the Iron Pnictides
• Monte Carlo Simulations of Spin Glasses at Low Temperatures
• Magnetic degeneracy and hidden metallicity of the spin density wave state in ferropnictides
• Consistent model of magnetism in ferropnictides
• Incommensurate spin-density wave order in electron-doped BaFe2As2 superconductors
• Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor
• Ising transition driven by frustration in a 2D classical model with SU(2) symmetry
• Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering
• Conductivity anisotropy in the antiferromagnetic state of iron pnictides
• Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors
• Unconventional disorder effects in correlated superconductors
• Magnetic order without tetragonal-symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum
• Electronic Structure of KFe${}_2$Se${}_2$ from First Principles Calculations
• The magnetic phase diagram of an extended J1-J2 model on a modulated square lattice and its implications for the antiferromagnetic phase of KyFexSe2
• Magnetic properties of spin diluted iron pnictides from muSR and NMR in LaFe1-xRuxAsO
• Finite-temperature properties of frustrated classical spins coupled to the lattice
• The fully frustrated XY model with next nearest neighbor interaction
• Spin Dilution in Frustrated Two-Dimensional s=1/2 Antiferromagnets on a Square Lattice
• Anticollinear magnetic order induced by impurities in the frustrated Heisenberg model of pnictides
• Magnetic Impurities in the Pnictide Superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
• Spin Glass in the Bond-Diluted J1-J2 Ising Model on the Square Lattice
• Magnetically polarized Ir dopant atoms in superconducting Ba(Fe${}_{1-x}$Ir${}_x$)${}_2$As${}_2$
• Revealing the degree of magnetic frustration by non-magnetic impurities