NMR investigation of superconductivity and antiferromagnetism in CaFe${}_2$As${}_2$ under pressure

Abstract

We report ${}^{75}$As NMR measurements in CaFe${}_2$As${}_2$, made under applied pressures up to 0.83 GPa produced by a standard clamp pressure cell. Our data reveal phase segregation of paramagnetic (PM) and antiferromagnetic (AFM) phases over a range of pressures, with the AFM phase more than 90 % dominant at low temperatures. In situ RF susceptibility measurements indicate the presence of superconductivity. ${}^{75}$As spin-lattice relaxation experiments indicate that the ${}^{75}$As nuclei sample the superconductivity while in the magnetically-ordered environment.

4 pages, 3 figures

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• Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
• Quenched Fe Moment in the Collapsed Tetragonal Phase of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$
• Electronic properties and surface states of RbNi${}_2$Se${}_2$