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arXiv 0902.2728cond-mat.supr-concond-mat.str-el
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Ru取代BaFe2-xRuxAs2的超导电性

Superconductivity in Ru substituted BaFe2-xRuxAs2

Shilpam Sharma, A. Bharathi, Sharat Chandra, Raghavendra Reddy, S. Paulraj, A. T. Satya, V. S. Sastry, Ajay Gupta, C. S. Sundar

摘要:

在22 K时发生体超导性的报道在BaFe 2-xRuxAs 2的多晶样品的标称Ru含量在x=0.75至1.125的范围内。系统的自旋密度波转变温度(TSDW)的抑制之前,在系统中的超导性的外观。提出了一个相图的基础上测得的TSDW和超导转变温度(TC)的变化作为Ru组合物的函数。能带结构计算表明Ru取代后在体系中引入了电子载流子。计算得到的Fe的磁矩在x=1.0处有一个最小值,表明磁矩的抑制与超导性的出现有关。给出了低温高场穆斯堡尔谱测量结果。这表明Ru取代后磁性相互作用减弱

英文摘要:

The occurrence of bulk superconductivity at ~22 K is reported in polycrystalline samples of BaFe2-xRuxAs2 for nominal Ru content in the range of x=0.75 to 1.125. A systematic suppression of the spin density wave transition temperature (TSDW) precedes the appearance of superconductivity in the system. A phase diagram is proposed based on the measured TSDW and superconducting transition temperature (TC) variations as a function of Ru composition. Band structure calculations, indicate introduction of electron carriers in the system upon Ru substitutiom. The calculated magnetic moment on Fe shows a minimum at x=1.0, suggesting that the suppression of the magnetic moment is associated with the emergence of superconductivity. Results of low temperature and high field Mossbauer measurements are presented. These indicate weakening of magnetic interaction with Ru substitution

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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