Doping dependence of the charge distribution of iron pnictides (CROSBI ID 554172)
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Podaci o odgovornosti
Lang, Guillaume ; Grafe, Hans-Joachim ; Manthey, Katarina ; Hammerath, Franziska ; Paar, Dalibor ; Koch, Katrin ; Rosner, Helge ; Behr, Günther ; Werner, Jochen ; Büchner, Bernd
engleski
Doping dependence of the charge distribution of iron pnictides
We have investigated the evolution, on doping, of the charge distribution in the new LaO1− xFxFeAs superconductor. This is done using 75As Nuclear Quadrupole Resonance (NQR), which is a sensitive local probe of the electric field gradient generated by the charge distribution. A significant increase of the quadrupole frequency is observed when going from the undoped situation to the superconducting region of the phase diagram, reflecting the change in density or spatial distribution of the electrons. This increase cannot be properly accounted for by LDA calculations, even though there is good agreement between theory and experience for the undoped case. We discuss this discrepancy as well as the relation to the superconductivity, i.e., the link to the doping-dependence of the critical temperature.
iron pnictides; superconductivity; NQR
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Podaci o prilogu
2009.
objavljeno
Podaci o matičnoj publikaciji
Podaci o skupu
Verhandlungen der Deutschen Physikalischen Gesellschaft
predavanje
22.03.2009-27.03.2009
Dresden, Njemačka