Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Poster Session: Superconductivity 1

TT 53.14: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG2

Magnetic properties and electronic correlations in BaTM2As2 (TM=Cr, Mn, Fe, Co, Ni, Cu, Zn) — •Francesco Scaravaggi1, Sebastian Selter1, Rhea Kappenberger1, Saicharan Aswartham1, Sabine Wurmehl1, Anja U.B. Wolter1, and Bernd Büchner1,21Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01069 Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, 01069, Dresden, Germany

In order to better understand the multi-orbital nature of Fe-based superconductors in combination with strong electronic correlations in this class of materials, we report on a systematic investigation of the magnetic and thermodynamic properties of the isostructural series BaTM2As2 (TM=Cr, Mn, Fe, Co, Ni, Cu, Zn). Magnetization, specific heat and dilatometry measurements were performed on single crystalline samples to investigate the changes in the electronic and magnetic character and the degree of electronic correlation, varying the average occupancy of the 3d shell as a control parameter within the series. The results show that upon changing the occupation of the 3d orbitals, the electronic and magnetic character changes dramatically, which suggests a very complex interaction between on-site Coulomb repulsion, Hund’s coupling and other competing effects.

This work has been supported by Graduiertenkolleg GRK 1621.

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