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" The nature of scientific evidence : "
edited by Mark L. Taper and Subhash R. Lele
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AL
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| Record Number
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900969
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LA6fw1n2p7
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| Title & Author
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Widespread orthorhombic fluctuations in the (Sr,Na)Fe2As2 family of superconductors [Article]\ Frandsen, BATaddei, KMBugaris, DEStadel, RYi, MAcharya, AOsborn, RRosenkranz, SChmaissem, OBirgeneau, RJ
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2018
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| Title of Periodical
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UC Berkeley
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| Abstract
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© 2018 American Physical Society. We report comprehensive pair distribution function measurements of the hole-doped iron-based superconductor system Sr1-xNaxFe2As2. Structural refinements performed as a function of temperature and length scale reveal orthorhombic distortions of the instantaneous local structure across a large region of the phase diagram possessing average tetragonal symmetry, indicative of fluctuating nematicity. These nematic fluctuations are present up to high doping levels (x=0.48, near optimal superconductivity) and high temperatures (above room temperature for x=0, decreasing to 150 K for x=0.48), with a typical length scale of 1-3 nm. This work highlights the ubiquity of nematic fluctuations in a representative iron-based superconductor and provides important details about the evolution of these fluctuations across the phase diagram.
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