Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Fe-based Superconductors - FeSe and 122
TT 5.2: Talk
Monday, April 1, 2019, 09:45–10:00, H23
Thermal expansion study on Fe1+yTe1−xSex — •Liran Wang1,2, Anna Böhmer2, Frédéric Hardy2, Thomas Wolf2, Peter Adelmann2, Michael Merz2, Mahmoud Abdel-Hafiez3, Rüdiger Klingeler1, and Christoph Meingast2 — 1Kirchhoff Institute of Physics, Heidelberg University, Germany — 2Institute for Solid State Physics, Karlsruhe Institute of Technology, Germany — 3Physikalisches Institute Goethe-Universität,Germany
The Fe1+yTe1−xSex series presents one of the main families of high TC Fe-based superconductors. To provide further insight into these materials, we present detailed thermal expansion study on high quality single-crystalline Fe1+yTe1−xSex (0 ≤ x ≤ 0.4) by means of high-precision capacitance dilatometry. Clear anomalies in the thermal expansivity are observed at both the magneto/structural and superconducting transitions. Further, the electronic component of the thermal expansion is quite large and can be extracted from the data. We discuss these data in light of strong electronic correlations and possible quantum criticality.