Structural and magnetic transition in CeFeAsO: separated or connected?

Abstract

Using an adapted Sn-flux growth technique we obtained comparatively large CeFeAsO single crystals of better quality than previously reported polycrystals or single crystals, as evidenced by much sharper anomalies at the structural and magnetic phase transitions as well as a much higher residual resistivity ratio of 12. In the magnetically ordered phase we observe a very pronounced metallic behavior of the in-plane resistivity, which excludes a Mott insulator regime at low temperature. The separation Delta_T = T_0 - T_N between structural and magnetic ordering temperatures decreases with increasing sample quality, from 18 K in the initial reports to 6 K in the present single crystals, demonstrating that this separation is not an intrinsic property of the RFeAsO systems. Our results indicate that the coupling between magnetic ordering and structural distortion is very similar in AFe2As2 and RFeAsO type of compounds, much more similar than previously thought. The implications of our experimental results give arguments both in favor and against the nematic phase model.

published in PRB with the title 'Coupling between the structural and magnetic transition in CeFeAsO'

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• Ferromagnetism and superconductivity in P-doped CeFeAsO
• Search for pressure induced superconductivity in CeFeAsO and CeFePO iron pnictides
• Specific Heat Anomalies in Solids Described by a Multilevel Model
• Heavy fermion and Kondo lattice behavior in the itinerant ferromagnet CeCrGe3
• Anisotropic electrical resistivity of LaFeAsO: evidence for electronic nematicity
• Magnetic structures and the Ce-Fe coupling induced Fe spin reorientation in CeFeAsO single crystal
• Interplay between Co-3d and Ce-4f magnetism in CeCoAsO
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• Synthesis, structural and physical properties of ${\delta }^{\prime }$-FeSe${}_{1-x}$
• Orbital-Selective Superconductivity and the Effect of Lattice Distortion in Iron-Based Superconductors
• Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction
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• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
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• Electron doping of the iron-arsenide superconductor CeFeAsO controlled by hydrostatic pressure
• Quantum tricriticality in transverse Ising-like systems
• Surface Nematic Order in Iron Pnictides
• Temperature dependent As K-edge EXAFS studies of LaFe1-xCoxAsO (x = 0.0 and 0.11) single crystals
• The magnetoresistance and Hall effect in CeFeAsO: a high magnetic field study
• Suppression of the magnetic order in CeFeAsO: non-equivalence of hydrostatic and chemical pressure
• How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view
• Complete electronic phase diagram and enhanced superconductivity in fluorine-doped PrFeAsO1-xFx
• Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors
• Compatible Instability: Gauge Constraints of Elasticity Inherited by Electronic Nematic Criticality