Nematicity and structure in LaFe1-xCoxAsO

Nematicity and structure in LaFe1-xCoxAsO

We present thermal expansion studies on single-crystalline LaFe1-xCoxAsO with doping levels of x = 0, 0.026, and 0.034, and on BaFe2As2. Anomalies in the thermal expansion coefficient α enable reading off the structural and magnetic transition temperatures TS and TN. The evolution of the orthorhombi...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2019-07, Vol.482, p.50-53
Hauptverfasser: Wang, L., Sauerland, S., Scaravaggi, F., Kappenberger, R., Aswartham, S., Wurmehl, S., Wolter, A.U.B., Büchner, B., Klingeler, R.
Format: Artikel
Sprache:eng
Schlagworte:
Anomalies
Magnetic transitions
Phase diagram
Phase diagrams
Phase transitions
Pnictides
Single crystals
Superconductivity
Temperature
Thermal expansion
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Zusammenfassung:We present thermal expansion studies on single-crystalline LaFe1-xCoxAsO with doping levels of x = 0, 0.026, and 0.034, and on BaFe2As2. Anomalies in the thermal expansion coefficient α enable reading off the structural and magnetic transition temperatures TS and TN. The evolution of the orthorhombic distortion at TS is illustrated by length changes of the a- and b-axes and the experimentally determined orthorhombicity δ. The results are compared to BaFe2As2. Finally, the electronic phase diagram is discussed.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.02.061