Y 89 NMR observation of ferromagnetic and antiferromagnetic spin fluctuations in the collapsed tetragonal phase of YFe2 (Ge,Si) 2

J. Srpčič, P. Jeglič, I. Felner, Bing Lv, C. W. Chu, D. Arčon

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3 引文 斯高帕斯(Scopus)

摘要

The surprising discovery of tripling the superconducting critical temperature of KFe2As2 at high pressures has led to an intriguing question of how the superconductivity in the collapsed tetragonal phase differs from that in the noncollapsed phases of Fe-based superconductors. Here we report a Y89 nuclear magnetic resonance study of YFe2GexSi2-x compounds whose electronic structure is similar to that of iron-pnictide collapsed tetragonal phases already at ambient pressure. We find that Fe(Ge,Si) layers show ferromagnetic spin fluctuations, whereas the layers are coupled antiferromagnetically. Furthermore, localized moments attributed either to Fe interstitial or antisite defects may account for magnetic impurity pair-breaking effects, thus explaining the substantial variation of superconductivity among different YFe2Ge2 samples.

原文English
文章編號174430
期刊Physical Review B
96
發行號17
DOIs
出版狀態Published - 2017 十一月 22

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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