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TT: Fachverband Tiefe Temperaturen

TT 5: Superconductivity: Fe-based Superconductors - FeSe and 122

TT 5.2: Vortrag

Montag, 1. April 2019, 09:45–10:00, H23

Thermal expansion study on Fe_1+yTe_1−xSe_x — •Liran Wang^1,2, 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 Fe_1+yTe_1−xSe_x series presents one of the main families of high T_C Fe-based superconductors. To provide further insight into these materials, we present detailed thermal expansion study on high quality single-crystalline Fe_1+yTe_1−xSe_x (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.