Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?

Details Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure? Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?

2009-02-23

arxiv.org/abs/0902.3832v2

Phys. Rev. Lett. 102 (2009) 177005.

Physics

Condensed Matter

Superconductivity

Accepted for publication in Phys. Rev. Lett. after minor revision

Scientific paper

10.1103/PhysRevLett.102.177005

Unlike the parent phases of the iron-arsenide high Tc superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with Tc~9K. Equally surprising is the fact that applied pressure dramatically enhances the modest Tc to ~37K. We investigate the electronic properties of FeSe using 77Se NMR to search for the key to the superconducting mechanism. We demonstrate that the electronic properties of FeSe are very similar to those of electron-doped FeAs superconductors, and that antiferromagnetic spin fluctuations are strongly enhanced near Tc. Furthermore, applied pressure enhances spin fluctuations. Our findings suggest a link between spin fluctuations and the superconducting mechanism in FeSe.

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