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

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

2009-01-16

arxiv.org/abs/0901.2472v2

Phys. Rev. B 79, 212502 (2009)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

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.

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