Dresden 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: Fe-based Superconductors - 1111,111, FeSe
TT 45.7: Talk
Tuesday, April 1, 2014, 15:30–15:45, HSZ 201
Magnetoresistance and Hall effect of Fe1.01Se — •Sahana Roessler, Cevriye Koz, Ulrich Schwarz, and Steffen Wirth — Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, 01187 Dresden
The simplest member of Fe-based superconductor Fe1.01Se displays a superconducting transition at Tc ≈ 8 K [1] and a structural transition at Ts ≈ 90 K [2]. Here we present magnetoresistance, Hall effect, and magnetic susceptibility of Fe1.01Se single crystals. The onset of negative magnetoresistance below Ts indicates a strong change to the Fermi surface topology at the structural phase transition. The Hall resistivity ρxy is negative below 55 K indicating electron dominated transport, and non-linear in magnetic field down to 12 K. The magnetic susceptibility also displays a minimum close to 30 K suggesting a strong enhancement of antiferromagnetic fluctuations. This behavior is in agreement with the temperature dependence of spin-fluctuation susceptibility in NMR measurements [3]. These results suggest that the pairing correlations in Fe1.01Se are enhanced by antiferromagnetic fluctuations.
F. C. Hsu et al. Proc. Natl. Acad. Sci (USA) 105, 14262 (2008)
T. M. McQueen et. al. Phys. Rev. Lett. 103, 057002 (2009)
T. Imai et. al. Phys. Rev. Lett. 102, 177005 (2009)