Evidence of spin-density-wave order in RFeAsO from measurements of thermoelectric power

Abstract

Data on the magneto-thermopower and specific heat of three compounds belonging to '1111' oxypnictides family are reported. One specimen (SmAsFeO0.8F0.2) is a superconductor with Tc = 53 K, while two others (SmAsFeO and NdAsFeO) are nonsuperconducting parent compounds. Our results confirm that spin density wave (SDW) order is present in SmAsFeO and NdAsFeO. In these two samples a strict connection between the thermoelectric power and electronic specific heat is found in the vicinity of SDW transition, what indicates that the chemical potential of charge carriers strongly depends on temperature in this region. Low temperature data suggest presence of significant contribution magnon-drag to the thermoelectric power.

14 pages, 5 figures; adjusted to referees' suggestions; to appear in Phys. Rev. B

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• Transport and superconducting properties of Fe-based superconductors: SmFeAs(O1-x Fx) versus Fe1+y (Te1-x, Sex)
• Seebeck effect in Fe1+xTe1-ySey single crystals
• Nernst effect in single crystals of the pnictide superconductor CaFe1.92Co0.08As2 and parent compound CaFe2As2
• Thermoelectric properties of iron-based superconductors and parent compounds
• Physical property characterization of single step synthesized NdFeAsO0.80F0.20 bulk 50K superconductor
• Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor
• Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1-xPxO1-y
• Point-contact study of ReFeAs(1-x)Fx (Re=La, Sm) superconducting films
• Magneto Seebeck effect in REFeAsO (RE=rare earth) compounds: probing the magnon drag scenario
• Magnetothermoelectric effects in Fe{1+d}Te{1-x}Se{x}
• Anisotropy of the Seebeck and Nernst coefficients in parent compounds of the iron-based superconductors
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution