热电势测量中RFeAsO自旋密度波序的证据
Evidence of spin-density-wave order in RFeAsO from measurements of thermoelectric power
摘要：
本文报道了三种1111氧氮族化合物的磁热电势和比热。一个样品（SmAsFeO 0.8F0.2）是一个超导体与Tc = 53 K，而其他两个（SmAsFeO和NdAsFeO）是非超导母体化合物。我们的研究结果证实，自旋密度波（SDW）秩序存在于SmAsFeO和NdAsFeO。在这两个样品中，在SDW转变附近发现热电势和电子比热之间存在严格的联系，这表明载流子的化学势强烈地依赖于该区域的温度。低温数据表明存在显着的贡献磁振子阻力的热电功率。
英文摘要：
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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