Transition from tunneling regime to local point contact realized on Ba0.6K0.4Fe2As2 surface<xref rid="cpb_26_6_067402fn1" ref-type="fn">*</xref><fn id="cpb_26_6_067402fn1"><label>*</label>Project supported by the National Natural Science Foundation of China (Grant Nos. 11574372 and 11322432) and the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB07020300).</fn>

Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface**

Project supported by the National Natural Science Foundation of China (Grant Nos. 11574372 and 11322432) and the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB07020300).

Hou Xingyuan^{1, 2}, Jie Yunyin^{1, 2}, Gong Jing^{1, 2}, Shen Bing², Zi Hai², Li Chunhong², Ren Cong², Shan Lei^{1, 2, 3, †}

(color online) (a) Spectra with varying from 0.55 G to 108 . (b) Relationship between current at mV and tip’s displacement. Initial position of the tip is defined as 0 and positive displacement means tip approaching to the sample surface. An exponential decay law is denoted as the straight line. Inset shows the rightmost part of the main panel in linear coordinate. (c) Fitting some normalized spectra to a modified BTK model with an anisotropic gap function of . (d) Fitting parameters plotted as the function of . Dotted line indicates the transition region. All data presented here were taken at T = 6.2 K.