Abstract
Abstract We present thermal expansion studies on single-crystalline LaFe 1 - x Co x AsO with doping levels of x = 0, 0.026, and 0.034, and on BaFe 2 As 2 . Anomalies in the thermal expansion coefficient α enable reading off the structural and magnetic transition temperatures T S and T N . The evolution of the orthorhombic distortion at T S 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.
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