Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.13: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
High field transport properties of 1111 parent compounds — •Martina Meinero1,2, Federico Caglieris3, Alessandro Leveratto2, Ilaria Pallecchi2, Gianrico Lamura2, Fabio Bernardini4, Alessia Provino1,2, Pietro Manfrinetti1,2, Maryam Shahrokhvand5, Uli Zeitler5, and Marina Putti1,2 — 1SPIN-CNR, C.so Perrone 24, 16152 Genova, Italy — 2University of Genova, Via Dodecaneso, 16146 Genova, Italy — 3IFW Dresden, 01069 Dresden, Germany — 4CNR-IOM-Cagliari and University of Cagliari, 09042 Monserrato, Italy — 5HFML-EMFL, Radboud University, Toernooiveld 7, 6525ED Nijmegen, Netherlands
The Fermi surface and the band structure of the 1111 family of Fe-based superconductors have been vastly theoretically investigated but a direct experimental insight is still lacking. We performed low-temperature transport measurements in high magnetic fields up to 30 T in several 1111 parent compounds. We detected Shubnikov de Haas oscillations in both the magnetoresistance of a single crystal of SmFeAsO and in the thermopower of a policrystalline sample of LaFeAsO. We also investigated the thermoelectric properties of polycrystalline CeFeAsO, PrFeAsO, NdFeAsO. Our results bring to the identification of a dominating cylindrical pocket, whose corresponding carrier density matches with the one obtained from Hall effect measurements. In addition we verified a good agreement with prediction of DFT calculations of the band structure.