反铁磁CaFe $_2$ As $_2$中反相畴壁成核的超导性证据
Evidence for filamentary superconductivity nucleated at antiphase domain walls in antiferromagnetic CaFe$_2$As$_2$
摘要：
电阻率，磁化强度和微观$^{75}$作为核磁共振（NMR）测量在反铁磁有序状态的铁基超导体母体材料CaFe $_2$作为$_2$表现出异常的功能，是一致的集体冻结域壁。低于$T^*\approx 10$ K，电阻率呈现峰值和下降，体磁化强度呈现急剧增加，并且$^{75}$ As NMR测量揭示超精细场的缓慢波动的存在。这些功能在这两个电荷和自旋响应是强烈的场依赖性，完全抑制由$H^*\approx 15$ T，并建议在这种材料的反相畴壁的非线性超导性的存在下成核。
英文摘要：
Resistivity, magnetization and microscopic $^{75}$As nuclear magnetic resonance (NMR) measurements in the antiferromagnetically ordered state of the iron-based superconductor parent material CaFe$_2$As$_2$ exhibit anomalous features that are consistent with the collective freezing of domain walls. Below $T^*\approx 10$ K, the resistivity exhibits a peak and downturn, the bulk magnetization exhibits a sharp increase, and $^{75}$As NMR measurements reveal the presence of slow fluctuations of the hyperfine field. These features in both the charge and spin response are strongly field dependent, are fully suppressed by $H^*\approx 15$ T, and suggest the presence of filamentary superconductivity nucleated at the antiphase domain walls in this material.
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