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

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

2009-03-11

arxiv.org/abs/0903.2011v2

Phy. Rev. Lett, 102, 227601 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.102.227601

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.

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