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Shuhei Yamaguchi,Nobuhiro Yamaguchi,Masaki Mito,Hiroyuki Deguchi,Peter. J. Baker,Stephen. J. Blundell,Michael. J. Pitcher,Dinah. R. Parker,Simon. J. Clarke 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The pressure effects on the 111-type Fe-based superconductor LiFeAs were investigated throughAC susceptibility measurements and X-ray diffraction experiments, and revealed a correlation betweenthe superconducting transition temperature (Tc) and the As-Fe-As bond angle (α) ratherthan the height of As from the Fe layers (hAs). As the pressure was increased, Tc of 17 K at P =0 GPa decreased down to 10 K at P = 5.2 GPa. According to a previous report from an X-raydiffraction experiment, α changes from 101.5˚ at 0 GPa to 97.8˚ at 17 GPa. The obtained changein Tc is consistent with Lee et al.’s plot of Tc as a function of α, and from this result, we concludethat Tc will fall to zero at around α = 98˚.