Why does undoped FeSe become a high-Tc superconductor under pressure?

T. Imai, K. Ahilan, F. L. Ning, T. M. McQueen, R. J. Cava

Research output: Contribution to journalArticlepeer-review

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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 Se77 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.

Original languageEnglish (US)
Article number177005
JournalPhysical review letters
Issue number17
StatePublished - Apr 29 2009

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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