Rare earth magnetism in CeFeAsO: A single crystal study

Abstract

Single crystals of CeFeAsO, large enough to study the anisotropy of the magnetic properties, were grown by an optimized Sn-flux technique. The high quality of our single crystals is apparent from the highest residual resistivity ratio, RRR = 12, reported among undoped RFeAsO compounds (R=rare earth) as well as sharp anomalies in resistivity, specific heat, C(T), and thermal expansion at the different phase transitions. The magnetic susceptibility chi(T) presents a large easy-plane anisotropy consistent with the lowest crystal electric field doublet having a dominant Gamma_6 character. Curie-Weiss like susceptibilities for magnetic field parallel and perpendicular to the crystallographic c-axis do not reveal an influence of a staggered field on the Ce site induced by magnetic ordering of the Fe. Furthermore, the standard signatures for antiferromagnetic order of Ce at T_N = 3.7 K observed in chi(T) and C(T) are incompatible with a Zeeman splitting Delta = 10 K of the CEF ground state doublet at low temperature due to the Fe-magnetic order as previously proposed. Our results can be reconciled with the earlier observation by assuming a comparatively stronger effect of the Ce-Ce exchange leading to a reduction of this Zeeman splitting below 15 K.

15 pages, 6 figures, added section on magn. susceptibility

References in corpus (14)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
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• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
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• Single crystals of LnFeAsO1-xFx (Ln=La, Pr, Nd, Sm, Gd) and Ba1-xRbxFe2As2: growth, structure and superconducting properties
• Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO
• CeFePO: A Heavy Fermion Metal with Ferromagnetic Correlations
• Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO
• Anisotropic magnetization, specific heat and resistivity of RFe2Ge2 single crystals
• The crystalline electric field as a probe for long range antiferromagnetic order and superconductivity in CeFeAsO${}_{1-x}$F${}_x$
• Single crystal growth and anisotropy of CeRuPO

Cited by in corpus (29)

• Superconductivity in Iron Compounds
• Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO
• Quantum criticality in the iron pnictides and chalcogenides
• High-pressure flux growth, structural, and superconducting properties of LnFeAsO (Ln = Pr, Nd, Sm) single crystals
• Phase diagram of CeFeAs${}_{1-x}$P${}_x$O obtained from electric resistivity, magnetization, and specific heat measurements
• Structural and magnetic transition in CeFeAsO: separated or connected?
• 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
• Ferromagnetism and superconductivity in P-doped CeFeAsO
• Quantm Magnetoresistance of the PrFeAsO oxypnictides
• Electronic Structure of CeFeAsO1-xFx (x=0, 0.11/x=0.12) compounds
• RKKY interaction in SDW phase of iron-based superconductors
• Specific Heat Anomalies in Solids Described by a Multilevel Model
• Heavy fermion and Kondo lattice behavior in the itinerant ferromagnet CeCrGe3
• Evolution of the multiband RKKY interaction: Application to iron pnictides and chalcogenides
• 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
• CeFePO: f-d hybridization and quenching of superconductivity
• Probing the Mott Physics in $\kappa$-(BEDT-TTF)${}_2$X Salts via Thermal Expansion
• Fe-spin reorientation in PrFeAsO : Evidences from resistivity and specific heat studies
• Electron Correlation and Spin Dynamics in Iron Pnictides and Chalcogenides
• Competing magnetic phases and field-induced dynamics in DyRuAsO
• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
• Crystal field excitations and magnons: their roles in oxyselenides Pr2O2M2OSe2 (M = Mn, Fe)
• Interplay between Fe 3d and Ce 4f magnetism and Kondo interaction in CeFeAs_{1-x}P_{x}O probed by ^{75}As and ^{31}P NMR
• Electron doping of the iron-arsenide superconductor CeFeAsO controlled by hydrostatic pressure
• 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
• Robust magnetic order of Ce 4f-electrons coexisting with superconductivity in CeFeAsO${}_{1-x}$F${}_x$