Synthesis and physical properties of LaO1-xFxFeAs

2008/11/30 by Agnieszka Kondrat, A. Kondrat, J. E. Hamann-Borrero +20
Business, Management and Accounting · Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Corporate Taxation and Avoidance #Crystal structure #Crystallite #Crystallography #Distortion (music) #Doping #Iron-based superconductors research #Magnetic field #Magnetization #Materials science #Metallurgy #Order (exchange) #Orthorhombic crystal system #Phase transition #Physics #Specific heat #Spin (aerodynamics) #Superconductivity #Thermodynamics #Transition temperature #cond-mat.supr-con

paper · pdf · doi:10.1140/epjb/e2009-00267-3

published as Eur. Phys. J. B 70, 461-468 (2009)

openalex publication_date 2009/07/22 · arxiv created 2009/09/10 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We have prepared the newly discovered Fe-based superconducting material \rm LaO_1-xF_xFeAs (0≤ x≤ 0.2) in polycrystalline form and have investigated the samples by means of structural, thermodynamic and transport measurements. Our investigations reveal a non superconducting phase at 0≤ x\lesssim0.04 which for x=0 is characterized by a structural transition towards an orthorhombic distortion at T_s≈ 160 K and antiferromagnetic spin order at T_N≈138 K. Both transitions lead to strong anomalies in various transport properties as well as in magnetization and in specific heat. Remarkably, the transition temperatures are only weakly doping dependent up x\lesssim 0.04. However, the transitions are abruptly suppressed at x≥0.05 in favour of a superconducting phase with a critical temperature T_c\gtrsim 20 K. Upon further increasing the F-doping T_c increases up to a maximum of T_c=26.8 K at x=0.1 which is followed by a decrease down to T_c≈10 K at x≥0.15.

Citations

• Correlated Electronic Structure ofLaO1−xFxFeAs
• Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx
• Even Parity, Orbital Singlet, and Spin Triplet Pairing for SuperconductingLaFeAsO1−xFx
• As<mml:mprescripts/><mml:none/>75NMR Studies of SuperconductingLaFeAsO0.9F0.1
• Superconductivity at 43 K in SmFeAsO1-xF x
• SrFeAsF as a parent compound for iron pnictide superconductors
• The electronic phase diagram of the LaO1−xFxFeAs superconductor
• Field and Temperature Dependence of the Superfluid Density inLaFeAsO1−xFxSuperconductors: A Muon Spin Relaxation Study
• Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields
• Superconductivity at 52 K in iron based F doped layered quaternary compound Pr[O1–xFx]FeAs
• High-Field Pauli-Limiting Behavior and Strongly Enhanced Upper Critical Magnetic Fields near the Transition Temperature of an Arsenic-DeficientLaO0.9F0.1FeAs1−δSuperconductor
• Upper critical field, Hall effect and magnetoresistance in the iron-based layered superconductor LaFeAsO0.9F0.1−δ
• Superconductivity and Crystal Structures of (Ba1−xKx)Fe2As2 (x=0–1)
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2
• Electronic Phase Separation in the Slightly Underdoped Iron Pnictide SuperconductorBa1−xKxFe2As2