Tuning the interplay between nematicity and spin fluctuations in Na1-x Li x FeAs superconductors

Nature Communications
S-H BaekKee Hoon Kim

Abstract

Strong interplay of spin and charge/orbital degrees of freedom is the fundamental characteristic of the iron-based superconductors (FeSCs), which leads to the emergence of a nematic state as a rule in the vicinity of the antiferromagnetic state. Despite intense debate for many years, however, whether nematicity is driven by spin or orbital fluctuations remains unsettled. Here, by use of transport, magnetization, and 75As nuclear magnetic resonance (NMR) measurements, we show a striking transformation of the relationship between nematicity and spin fluctuations (SFs) in Na1-xLi x FeAs; For x ≤ 0.02, the nematic transition promotes SFs. In contrast, for x ≥ 0.03, the system undergoes a non-magnetic phase transition at a temperature T0 into a distinct nematic state that suppresses SFs. Such a drastic change of the spin fluctuation spectrum associated with nematicity by small doping is highly unusual, and provides insights into the origin and nature of nematicity in FeSCs.

References

Feb 24, 2009·Nature Materials·H LuetkensB Büchner
Apr 11, 2009·Chemical Communications : Chem Comm·Dinah R ParkerSimon J Clarke
Jun 13, 2009·Physical Review Letters·T ImaiR J Cava
Aug 8, 2009·Physical Review Letters·G F ChenN L Wang
Apr 7, 2010·Physical Review Letters·F L NingH-H Wen
Oct 15, 2013·Physical Review Letters·Rafael M FernandesJörg Schmalian
Nov 11, 2014·Nature Materials·S-H BaekB Büchner
Nov 24, 2016·Reports on Progress in Physics·Rafael M Fernandes, Andrey V Chubukov
Dec 15, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Anna E Böhmer, Andreas Kreisel

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nuclear magnetic resonance
x-ray diffraction
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