Measurement of the elastoresistivity coefficients of the underdoped iron arsenide Ba(Fe sub(0.975) Co sub(0.025)) sub(2) As sub(2)

A new method is presented for measuring terms in the elastoresistivity tensor m sub(ij) of single crystal samples with tetragonal symmetry. The technique is applied to a representative underdoped Fe-arsenide, Ba(Fe sub(0.975) Co sub(0.025)) sub(2) As sub(2), revealing an anomalously large and anisot...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-08, Vol.88 (8)
Hauptverfasser: Kuo, Hsueh-Hui, Shapiro, Maxwell C, Riggs, Scott C, Fisher, Ian R
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Sprache:eng
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Zusammenfassung:A new method is presented for measuring terms in the elastoresistivity tensor m sub(ij) of single crystal samples with tetragonal symmetry. The technique is applied to a representative underdoped Fe-arsenide, Ba(Fe sub(0.975) Co sub(0.025)) sub(2) As sub(2), revealing an anomalously large and anisotropic elastoresistance in comparison to simple metals. The m sub(66) coefficient follows a Curie-Weiss temperature dependence, providing direct evidence that the tetragonal-to-orthorhombic structural phase transition that occurs at T sub(s) = 97.5 K in this material is not the result of a true-proper ferroelastic transition. Rather, the material suffers a pseudoproper transition for which the lattice strain is not the primary order parameter.
ISSN:1098-0121
1550-235X