High-pressure synthesis and physical properties of new iron (nickel)-based superconductors
作者:P.M. Shirage、K. Miyazawa、M. Ishikado、K. Kihou、C.H. Lee、N. Takeshita、H. Matsuhata、R. Kumai、Y. Tomioka、T. Ito、H. Kito、H. Eisaki、S. Shamoto、A. Iyo
DOI:10.1016/j.physc.2009.03.027
日期:2009.5
utilized a high-pressure (HP) technique to synthesize a series of newly-discovered iron (nickel)-based superconductors. For the LnFeAsO-based superconductors (Ln = lanthanide), we show that the introduction of oxygen (O)-deficiency in the LnO layers, which is achievable only through HP process, is an effective way to dope electron carriers into the system, which results in yielding the superconducting transition
我们已经利用高压(HP)技术合成了一系列新发现的铁(镍)基超导体。对于基于Ln FeAsO的超导体(Ln =镧系元素),我们证明只有通过HP工艺才能在Ln O层中引入缺氧(O)是将电子载流子掺杂到系统中的有效方法,这导致产生的超导转变温度(T c)与F取代的对应物相当。缺氧,Ln离子变化和外部压力对T c的影响被检查。所有实验数据表明,晶体结构与氧代超导体的超导性之间具有很强的相关性。对PrFeAsO 1- y单晶样品的上临界场测量结果显示,超导各向异性为5,小于铜酸盐。通过显示多晶(Ca,Na)Fe 2 As 2,(Ba,K)Fe 2 As 2以及单晶BaNi的结果,我们还证明了HP技术适用于所谓的'122'系统2 P 2个样本。