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

研究成果: Article査読

48 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号077006
ジャーナルPhysical review letters
101
7
DOI
出版ステータスPublished - 2008 8 15
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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