Sm $_{1-x}$ Th $_x$ OFeAs中多玻色子发射的证据
Evidence of a multiple boson emission in Sm$_{1-x}$Th$_x$OFeAs
摘要：
研究了在不同钍浓度（$x = 0.08 - 0.3$）和临界温度（$T_c = 26-50$，K）下Sm-$_{1-x}$-Th-$_x$-OFeAs超导体中Andreev阵列动态电导谱中观察到的可重复的精细结构.这种结构无疑是由多重Andreev反射过程中的多重玻色子发射（具有相同的能量）引起的。对最佳配合物，直接测定玻色模能量可达$\varepsilon_0 = 14.8 \pm 2.2$. meV。在所研究的$T_c$范围内，该能量以及大的$Δ_L$和小的$Δ_S$超导带隙几乎与临界温度成比例，其特征比$\varepsilon_0/k_BT_c \approx 3.2$（和相应的$2Δ_L/k_BT_c \approx 5.3$）分别类似于$s^{\pm}$和$s^{++}$状态下自旋共振和谱密度增强的预期能量$Δ_L + Δ_S$。
英文摘要：
We studied a reproducible fine structure observed in dynamic conductance spectra of Andreev arrays in Sm$_{1-x}$Th$_x$OFeAs superconductors with various thorium concentrations ($x = 0.08 - 0.3$) and critical temperatures $T_c = 26-50$\,K. This structure is unambiguously caused by a multiple boson emission (of the same energy) during the process of multiple Andreev reflections. The directly determined energy of the bosonic mode reaches $\varepsilon_0 = 14.8 \pm 2.2$\,meV for optimal compound. Within the studied range of $T_c$, this energy as well as the large $Δ_L$ and the small $Δ_S$ superconducting gaps, nearly scales with critical temperature with the characteristic ratio $\varepsilon_0/k_BT_c \approx 3.2$ (and $2Δ_L/k_BT_c \approx 5.3$, correspondingly) resembling the expected energy $Δ_L + Δ_S$ of spin resonance and spectral density enhancement in $s^{\pm}$ and $s^{++}$ states, respectively.
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