论文标题
Mössbauer对BAFE2（AS1-XPX）2中自旋和电荷调节的研究
Mössbauer studies of spin- and charge-modulations in BaFe2(As1-xPx)2
论文作者
论文摘要
BAFE2（AS1-XPX）2种具有X = 0（父）的化合物，X = 0.10（居中），X = 0.31，0.33，0.53（分别为TC = 27.3 K，27.6 K，13.9 K，分别为27.3 K，13.9 K，分别为27.6 K，13.9 K，），并已使用57次使用了57.70，0.70，0.70，0.70，0.70，0.77（过量）。特别注意旋转密度波（SDW）抗磁磁性，旋转循环和超导型跃迁的区域。与母体化合物和保留的二维磁性平面和一维旋转的二维通用类别相比，BAFE2（AS0.90P0.10）2化合物表现出SDW的幅度降低。 X = 0.10的自旋纽马相区域的特征是不一致的磁顺序。 BAFE2（AS0.69P0.31）2显示由于量子临界点附近而导致的弱磁顺序和超导性的共存。 BAFE2（AS0.67P0.33）2和BAFE2（AS0.47P0.53）2中的电荷密度调制2超导体在TC附近被扰动。对于X = 0.33的系统，观察到了跨超导转换的平均四极杆分裂的明显驼峰。磷取代增加了BAFE2（AS1-XPX）2化合物的Debye温度。此外，在该材料中，Fe核的实验电子电荷密度最终表明应将其识别为孔掺杂系统。测得的Mössbauer光谱移位和光谱区域不受过渡到超导状态的影响。这表明Fe核的平均电子密度和BAFE2（AS1-XPX）2中Fe-Sublattice的动态特性都不对超导转变敏感。在密度功能理论的框架内执行了确定BAFE2（AS1-XPX）2的Mössbauer光谱（AS1-XPX）2的Mössbauer光谱（AS1-XPX）2的模式的高精细参数的理论计算。
The BaFe2(As1-xPx)2 compounds with x = 0 (parent), x = 0.10 (under-doped), x = 0.31, 0.33, 0.53 (superconductors with Tc = 27.3 K, 27.6 K, 13.9 K, respectively) and x = 0.70, 0.77 (over-doped) have been investigated versus temperature using 57Fe Mössbauer spectroscopy. Special attention was paid to regions of the spin-density-wave (SDW) antiferromagnetic order, spin-nematic phase, and superconducting transition. The BaFe2(As0.90P0.10)2 compound exhibits a reduced amplitude of SDW as compared to the parent compound and preserved universality class of two-dimensional magnetic planes with one-dimensional spins. The spin-nematic phase region for x = 0.10 is characterized by an incoherent magnetic order. BaFe2(As0.69P0.31)2 shows coexistence of a weak magnetic order and superconductivity due to the vicinity of the quantum critical point. The charge density modulations in the BaFe2(As0.67P0.33)2 and BaFe2(As0.47P0.53)2 superconductors are perturbed near Tc. Pronounced hump of the average quadrupole splitting across superconducting transition is observed for the system with x = 0.33. The phosphorus substitution increases the Debye temperature of the BaFe2(As1-xPx)2 compound. Moreover, experimental electron charge densities at Fe nuclei in this material conclusively show that it should be recognized as a hole-doped system. The measured Mössbauer spectral shift and spectral area are not affected by transition to the superconducting state. This indicates that neither the average electron density at Fe nuclei nor the dynamical properties of the Fe-sublattice in BaFe2(As1-xPx)2 are sensitive to the superconducting transition. Theoretical calculations of hyperfine parameters determining the patterns of Mössbauer spectra of BaFe2(As1-xPx)2 with x = 0, 0.31, 0.5, and 1.0 are performed within the framework of the density functional theory.
