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

TT: Fachverband Tiefe Temperaturen

TT 52: Superconductivity: Fe-based Superconductors – FeSe and others

TT 52.9: Vortrag

Mittwoch, 18. März 2015, 11:45–12:00, H 2053

Superconductivity in the layered iron-germanide YFe2Ge2Jiasheng Chen1, Zhuo Feng2, Yang Zou1, Peter Logg1, Giulio Lampronti3, and •Malte Grosche11Cavendish Laboratory, Cambridge UK — 2London Centre of Nanotechnology, University College, London UK — 3Dept. of Earth Sciences, Cambridge UK

In the d-electron system YFe2Ge2, an unusually high Sommerfeld ratio of the specific heat capacity C/T ∼ 100 mJ/(molK2) and a non Fermi-liquid temperature dependence of the electrical resistivity ρ ≃ ρ0 + AT3/2 signal strong electronic correlations in an anomalous metallic state. Full resistive transitions, DC diamagnetic screening fractions of up to 80% and clear heat capacity anomalies observed at the transition suggest that pure samples of YFe2Ge2 superconduct below 1.8 K [1]. Although the nominal Fe valence in YFe2Ge2 is the same as in the isostructural iron-arsenides (K/Rb/Cs)Fe2As2, which have similar superconducting transition temperatures and a similarly enhanced heat capacity as YFe2Ge2, DFT studies suggest that the electronic structure of YFe2Ge2 differs substantially from that of the iron-arsenide superconductors, motivating alternative scenarios [2].


[1] Y. Zou et al, Physica Status Solidi (RRL) 8, 928 (2014).

[2] A. Subedi, PRB 89 024504 (2014);

D. J. Singh, ibid. 024505 (2014).

100% | Bildschirmansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2015 > Berlin