Spin dynamics in iron-based layered superconductor (La0.87Ca0.13)FePO revealed by P31 and La139 NMR studies

Yusuke Nakai, Kenji Ishida, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We report P31 and La139 NMR studies of (La0.87Ca0.13)FePO, which is a family member of the recently discovered superconductor LaFeAs(O1-xFx). In the normal state, Knight shift and nuclear spin-lattice relaxation rate divided by T (1/T1T) show that a Fermi-liquid state with moderate ferromagnetic fluctuations emerges below 30 K. From 1/T1T of P31 and La139, a quasi-two- dimensional electronic structure is suggested, in which the FeP layer is more conductive than the LaO layer. In the superconducting (SC) state, although a clear Meissner signal was observed, 1/T1T increases below Tc, in contrast to a decrease of 1/T1T due to the opening of a SC gap, suggesting that novel low-energy spin dynamics develop in the SC state.

Original languageEnglish
Article number077006
JournalPhysical review letters
Volume101
Issue number7
DOIs
Publication statusPublished - 2008 Aug 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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