Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.12: Poster
Mittwoch, 28. März 2012, 15:00–19:00, Poster B
Electronic Transport Properties of LiFeAs and Transition Metal doped LiFeAs in comparison to doped and undoped NaFeAs — •Dirk Bombor1, Anne Bachmann1, Luminita Harnagea1, Claudia Nacke1, Saicharan Aswaratham1, Igor Morozov2, Maria Roslowa2, Sabine Wurmehl1, Christian Hess1, and Bernd Büchner1 — 1Leibnitz Institute for Solid State and Materials Research, IFW Dresden, Germany — 2Moscow State University, Moscow 119991, Russia
Electronic transport properties of the unconventional 111-superconductors LiFeAs and NaFeAs as well as its transition metal doped compounds have been studied. Unlike in other iron arsenide superconductors the stoichiometric LiFeAs doesn’t show any nesting of the Fermi surface and therefore exhibits no spin density wave but even the undoped compound becomes superconducting below 18 K. We find that doping by substitution of iron with Co, Ni, Cr or Rh suppresses superconductivity. Ferromagnetism in Li-deficient samples is discussed. The isostructural NaFeAs also exhibits superconductivity in its undoped state, but in contrast to LiFeAs a structural and SDW-transitions are found. With Co-doping the SDW-transition can be suppressed and the superconducting transition temperature increased.