Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 110: Superconductivity: Fe-based Superconductors - 1111 and Others
TT 110.8: Vortrag
Freitag, 16. März 2018, 11:30–11:45, H 3010
Low temperature heat capacity in the iron-based superconductor YFe2Ge2 — •Keiron Murphy1, Jiasheng Chen1, Jacintha Banda2, Jordan Baglo1, Manuel Brando2, Michael Sutherland1, and Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, UK — 2MPI Chemical Physics of Solids, Nöthnitzer Strasse 40, Dresden
Unconventional superconductivity is rare in transition metal compounds outside the layered iron pnictide/chalcogenide and cuprate material families. These systems typically have highly anisotropic electronic properties and nearly 2D Fermi surface geometries. The iron based unconventional superconductor YFe2Ge2, by contrast, displays a comparatively isotropic, 3D electronic structure. Its Sommerfeld ratio C/T, is enhanced by an order of magnitude above the band structure value to γ ∼ 100 mJ/(mol K2) at low temperature, and it displays an anomalous form for the temperature dependence of the resistivity, ρ(T) = ρ0 + AT3/2. Theoretical proposals for the pairing mechanism in YFe2Ge2 include both triplet [1] and singlet, s* order parameter wave functions [2], prompting a renewed effort to examine the heat capacity well below the transition temperature in newly available bulk superconducting single crystals.
D. J. Singh, Phys. Rev. B 89, 024505 (2014).
A. Subedi, Phys. Rev. B 89, 024504 (2014).