Berlin 2015 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 43: Superconductivity: Fe-based Superconductors – 122

TT 43.1: Topical Talk

Dienstag, 17. März 2015, 14:00–14:30, H 2053

Magnetism and Superconductivity in Eu-Based Iron Pnictides — •Sina Zapf — 1. Physikalisches Institut, Universität Stuttgart, Germany

EuFe₂As₂ is an extraordinary parent compound of the iron pnictides, as it exhibits at low temperatures – additional to the Fe spin density wave – long-range magnetic order of the Eu²⁺ local moments. Nevertheless, bulk superconductivity around 30 K can be induced by mechanical pressure or chemical substitution.

In this talk we review the remarkable interplay of unconventional superconductivity, itinerant and local magnetism in Eu based iron pnictides. We focus on the appearance of a re-entrant spin glass phase that coexists with superconductivity [1] and an indirect magneto-elastic coupling, enabling the persistent magnetic detwinning by small magnetic fields [2].

This work was done in collaboration with the groups of D. N. Basov, R. Kremer, and P. Gegenwart.

[1] S. Zapf et al., Phys. Rev. Lett. 110, 237002 (2013)

[2] S. Zapf et al., Phys. Rev. Lett. 113, 227001 (2014)