论文标题
在SR（Fe1-XMNX）2AS2晶体中，通过过渡金属砷通量生长的SR（Fe1-XMNX）中的可能性差距和可能的固有Griffith阶段
Miscibility gap and possible intrinsic Griffiths phase in Sr(Fe1-xMnx)2As2 crystals grown by transitional metal arsenide flux
论文作者
论文摘要
已系统地研究了掺杂Mn的SRFE2AS2晶体的晶体结构，磁性，电子和热性能。在系统中发现X = 0.4362（4）到X = 0.9612（9）的混杂差距。对于x <0.2055（2），保持四方结构（空间构建型I4/mmm（第139号））的单晶具有连续扩大的晶格参数C，然后进行相位分离，其晶体均保持四方和三角形结构，直至x = 0.4362（4）。除了X> 0.9612（9）的晶体外，晶体持有三角结构（空间群P-3M1（第164号））。此外，抑制了x = 0至x = 0.0973（1）的自旋密度波排序，其次是异常，并扩大了x = 0.0973（1）至x = 0.2055（2）的排序温度的升高。根据X射线衍射的结果消除了MN和Fe实时空间相位的可能性，这种新型现象可以归因于可能的内在Griffith相。在整个组合物范围内，没有观察到任何超导信号以0 <x <1。
The crystal structure, magnetic, electronic, and thermal properties of Mn-doped SrFe2As2 crystals have been systematically investigated. A miscibility gap is found in the system from x = 0.4362(4) to x = 0.9612(9). For x < 0.2055(2), the single crystals holding tetragonal structure (space group I4/mmm (no. 139)) have a continuously enlarged lattice parameter c, followed by a phase separation with crystals holding both tetragonal and trigonal structures up to x = 0.4362(4). Beyond the miscibility gap, the crystals with x > 0.9612(9) hold the trigonal structure (space group P-3m1 (no. 164)). Moreover, the spin density wave ordering for x = 0 to x = 0.0973(1) is suppressed, followed by an abnormal and broadened increase of the ordering temperature for x = 0.0973(1) to x = 0.2055(2). Eliminating the possibility of real-space phase separation of Mn and Fe based on the results of X-ray diffraction, this novel phenomenon can be attributed to a possible intrinsic Griffiths phase. No any superconducting signals are observed down to 2 K in the whole composition range with 0 < x < 1. A phase diagram with multi-critical points of Mn-doped SrFe2As2 system is established accordingly.
