Magnetic glassy phase in FeSeTe single crystals

Abstract

The evolution of the magnetic order in FeSeTe crystals as a function of Se content was investigated by means of ac/dc magnetometry and muon-spin spectroscopy. Experimental results and self-consistent DFT calculations both indicate that muons are implanted in vacant iron-excess sites, where they probe a local field mainly of dipolar origin, resulting from an antiferromagnetic (AFM) bicollinear arrangement of iron spins. This long-range AFM phase disorders progressively with increasing Se content. At the same time all the tested samples manifest a marked glassy character that vanishes for high Se contents. The presence of local electronic/compositional inhomogeneities most likely favours the growth of clusters whose magnetic moment "freezes" at low temperature. This glassy magnetic phase justifies both the coherent muon precession seen at short times in the asymmetry data, as well as the glassy behaviour evidenced by both dc and ac magnetometry.

Approved for publication in J. Phys.: Condens. Matter

References in corpus (16)

• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Bi-collinear antiferromagnetic order in the tetragonal $\alpha$-FeTe
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Signatures of Spin Glass Freezing in NiO Nanoparticles
• Density Functional Study of Excess Fe in Fe${}_{1+x}$Te: Magnetism and Doping
• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• Evidence of local structural inhomogeneity in FeSe(1-x)Te(x) from extended x-ray absorption fine structure
• Magnetic-superconducting phase boundary of SmFeAsO${}_{1-x}$F${}_x$ studied via muon spin rotation: Unified behavior in a pnictide family
• Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)
• A new approach for improving global critical current density in Fe(Se0.5Te0.5) polycrystalline materials
• Disappearance of static magnetic order and evolution of spin fluctuations in Fe${}_{1+\delta }$Se${}_x$Te${}_{1-x}$
• Magnetic excitations of Fe_{1+y}Se_xTe_{1-x} in magnetic and superconductive phases
• On the consistency of the Aoki-phase
• Nanoscopic coexistence of magnetic and superconducting states within the FeAs layers of CeFeAsO1-xFx
• Competing orders suppressed by disorder around a hidden quantum critical point in cuprate high Tc superconductors

Cited by in corpus (8)

• Playing quantum hide-and-seek with the muon: localizing muon stopping sites
• Ab initio strategy for muon site assignment in wide band gap fluorides
• The phase diagrams of iron-based superconductors: theory and experiments
• MuFinder: A program to determine and analyse muon stopping sites
• Close proximity of FeSe to a magnetic quantum critical point as revealed by high-resolution $\mu$SR measurements
• Intrinsic nature of spontaneous magnetic fields in superconductors with time-reversal symmetry breaking
• Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO
• Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$