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Thermal expansion of LaFeAsO: Evidence for high-temperature fluctuations

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arxiv 0903.1235 v2 pith:2ZW2H3MX submitted 2009-03-06 cond-mat.supr-con

L. Wang , U. Kohler , N. Leps , A. Kondrat , M. Nale , A. Gasparini , A. de Visser , G. Behr
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C. Hess R. Klingeler B. Buchner
This is my paper · ORCID
classification cond-mat.supr-con
keywords expansionfluctuationsstructuralthermalalphacoefficientevidencelafeaso
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We present measurements of the thermal expansion coefficient alpha of polycrystalline LaFeAsO1-xFx (x <= 0.1). The magnetic and structural transitions of the samples with x <= 0.04 give rise to large anomalies in alpha(T), while the onset of superconductivity in the crystals with x >= 0.05 is not resolved. Above the structural transition, the thermal expansion coefficient of LaFeAsO is significantly enhanced. This is attributed to fluctuations, which also affect the electrical transport properties of the compound. The complete absence of these fluctuations in the superconducting samples even for x = 0.05 is taken as evidence for an abrupt first-order type of suppression of the structural and magnetic transitions upon F doping.

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