Pressure-Induced Superconductivity from Doping-Induced Antiferromagnetic Phase of 112-type Ca${}_{1-x}$La${}_x$FeAs${}_2$

Abstract

The effects of pressure on antiferromagnetic (AFM) and superconducting phase transitions of 112-type Ca${}_{1-x}$La${}_x$FeAs${}_2$ were studied, and the in-plane electrical resistivity ${\rho }_{ab}$ was measured with an indenter-type pressure cell. The AFM phase transition temperatures of $T_{\mathrm{N}}$ = 47, 63, and 63 K at ambient pressure for $x$ = 0.18, 0.21, and 0.26 was suppressed by applying pressure $P$, with superconductivity emerging at critical pressures of $P_{\mathrm{c}}$ $\simeq$ 0, 1.5, and 3.4 GPa, respectively. Correspondingly, the slope of $T_{\mathrm{N}}$ against $P$ decreased as $d{T}_{\mathrm{N}}/P$ $\simeq$ $-$15 and $-$2 K/GPa for $x$ = 0.21 and 0.26, respectively. Thus, although the AFM phase was stabilized with La doping $x$, the AFM phase was suppressed by pressure, and superconductivity eventually emerged.

4 pages, 2 figures, Note added after publication: We noticed a paper by Yazhou Zhou et al. [Science Bulletin, 62, 857(2017)] reporting the pressure-induced superconductivity in the 112 system

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