Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO

Abstract

Millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO were grown in NaAs flux at ambient pressure. The detailed growth procedure and crystal characterizations are reported. The as-grown crystals have typical dimensions of 3 * 4 * 0.05-0.3 mm3 with the crystallographic c-axis perpendicular to the plane of the plate-like single crystals. Some crystals manifest linear dimensions as large as 4-5 mm. X-ray and neutron single crystal scattering confirmed that LaFeAsO crystals exhibit a structural phase transition at Ts ~ 154 K and a magnetic phase transition at TSDW ~ 140 K. The transition temperatures agree with those determined by anisotropic magnetization, in-plane electrical resistivity and specific heat measurements and are consistent with previous reports on polycrystalline samples. Co and F were successfully introduced into the lattice leading to superconducting LaFe1-xCoxAsO and LaFeAsO1-xFx single crystals, respectively. This growth protocol has been successfully employed to grow single crystals of NdFeAsO. Thus it is expected to be broadly applicable to grow other RMAsO (R = rare earth, M = transition metal) compounds. These large crystals will facilitate the efforts of unraveling the underlying physics of iron pniticide superconductors.

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Cited by in corpus (43)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO
• NMR Search for the Spin Nematic State in LaFeAsO Single Crystal
• High-pressure flux growth, structural, and superconducting properties of LnFeAsO (Ln = Pr, Nd, Sm) single crystals
• Critical current scaling and anisotropy in oxypnictide superconductors
• Phase diagram of CeFeAs${}_{1-x}$P${}_x$O obtained from electric resistivity, magnetization, and specific heat measurements
• Stripe antiferromagnetic correlations in LaFeAsO1-xFx probed by 75As NMR
• Interplay between Fe and Nd magnetism in NdFeAsO single crystals
• Rare earth magnetism in CeFeAsO: A single crystal study
• Surface and bulk electronic structures of LaOFeAs studied by angle resolved photoemission spectroscopy
• Structural and magnetic transition in CeFeAsO: separated or connected?
• Unified phase diagram for iron-based superconductors
• Surface-driven electronic structure in LaFeAsO studied by angle resolved photoemission spectroscopy
• Optical spectroscopy study on single crystalline LaFeAsO
• Structural phase transition and superlattice misfit strain of RFeAsO (R = La, Pr, Nd and Sm)
• Bulk Synthesis of Iron-based Superconductors
• Structural trends from a consistent set of single-crystal data of REFeAsO (RE = La, Ce, Pr, Nd, Sm, Gd, and Tb)
• Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering
• Phase transitions and iron-ordered moment form factor in LaFeAsO
• Quasiparticle interference of C2-symmetric surface states in LaOFeAs parent compound
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• Magnetic property and crystalline electric field effect in ThCr${}_2$Si${}_2$-type CeNi${}_2$As${}_2$
• Formation of partial energy gap below the structural phase transition and the rare-earth element substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)
• Anisotropic electrical resistivity of LaFeAsO: evidence for electronic nematicity
• Growth of whisker-like and bulk single crystals of PrFeAs(O,F) under high pressure
• Singular magnetic anisotropy in the nematic phase of FeSe
• Two-dimensional magnetic interactions in LaFeAsO
• Magnetic and structural transitions in La${}_{0.4}$Na${}_{0.6}$Fe${}_2$As${}_2$ single crystals
• Magnetic structures and the Ce-Fe coupling induced Fe spin reorientation in CeFeAsO single crystal
• Growth and characterization of CaFe${}_{1-x}$Co${}_x$AsF single crystals by CaAs flux method
• Flux growth utilizing the reaction between flux and crucible
• Nematic Fluctuations and Phase Transitions in LaFeAsO: a Raman Scattering Study
• Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45
• Fe-As bond fluctuations in a double-well potential in LaFeAsO
• High superconducting anisotropy and weak vortex pinning in Co doped LaFeAsO
• Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering
• Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction
• Magneto-Transport Properties of Single Crystalline LaFeAsO
• Single-crystal growth of iron-based superconductor La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$
• Superconductivity induced by U-doping in the SmFeAsO system
• Temperature dependent As K-edge EXAFS studies of LaFe1-xCoxAsO (x = 0.0 and 0.11) single crystals