Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO

Abstract

We present results of transport and magnetic properties and heat capacity measurements on polycrystalline CeFeAsO, PrFeAsO, and NdFeAsO. These materials undergo structural phase transitions, spin density wave-like magnetic ordering of small moments on iron, and antiferromagnetic ordering of rare earth moments. The temperature dependence of the electrical resistivity, Seebeck coefficient, thermal conductivity, Hall coefficient, and magnetoresistance are reported. The magnetic behavior of the materials have been investigated using Mossbauer spectroscopy and magnetization measurements. Transport and magnetic properties are affected strongly by the structural and magnetic transitions, suggesting significant changes in the band structure and/or carrier mobilities occur, and phonon-phonon scattering is reduced upon transformation to the low temperature structure. Results are compared to recent reports for LaFeAsO, and systematic variations in properties as the identity of Ln is changed are observed and discussed. As Ln progresses across the rare-earth series from La to Nd, an increase in the hole contributions to Seebeck coefficient, and increases in magnetoresistance and the Hall coefficient are observed in the low temperature phase. Analysis of hyperfine fields at the iron nuclei determined from Mossbauer spectra indicates that the moment on Fe in the orthorhombic phase is nearly independent of the identity of Ln, in apparent contrast to reports of powder neutron diffraction refinements.

Published in New Journal of Physics focus issue on Iron-Based Superconductrors; minor corrections to text

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Cited by in corpus (26)

• Magnetism in Fe-based superconductors
• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• Spin excitations in the excitonic spin-density-wave state of the iron pnictides
• Nd induced Mn spin-reorientation transition in NdMnAsO
• Rare earth magnetism in CeFeAsO: A single crystal study
• Excitonic spin density wave state in iron pnictides
• Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states
• Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO
• Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO
• Magnetic order in orbital models of the iron pnictides
• Search for pressure induced superconductivity in CeFeAsO and CeFePO iron pnictides
• Effect of the chemical pressure on superconductivity and SDW in undoped and 15%F doped La1-yYyFeAsO compounds
• Electronic Structure of CeFeAsO1-xFx (x=0, 0.11/x=0.12) compounds
• Experimental Evidences for Static Charge Density Waves in Iron Oxy-pnictides
• Structural and physical properties of layered oxy-arsenides LnRuAsO (Ln = La, Nd, Sm, Gd)
• Electronic phase diagram of NdFe1-xRhxAsO
• Magneto-structural coupling and harmonic lattice dynamics in CaFe${}_2$As${}_2$ probed by Mössbauer spectroscopy
• Spatial Inhomogeneity in RFeAsO1-xFx (R =Pr, Nd) Determined from Rare Earth Crystal Field Excitations
• Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO
• Iron spin-reorientation transition in NdFeAsO
• Revisiting the phase diagram of LaFe${}_{1-x}$Co${}_x$AsO on single crystals by thermodynamic methods
• A direct probe of the variability of Coulomb correlation in Fe-pnictide superconductors
• Paramagnetic Phase of a Heavy-Fermion Compound, CeFePO, Probed by 57Fe Mössbauer Spectroscopy
• Effect of antifluorite layer on the magnetic order in Eu-based 1111 compounds, EuTAsF (T = Zn, Mn, and Fe)
• Isovalent substitution effects of arsenic on structural and electrical properties of iron-based superconductor NdFeAsO0.8F0.2