Naslov
Electronic properties of iron pnictides in the normal state probed by NMR

Autori
Hammerath, Franziska ; Lang, Guillaume ; Grafe, Hans-Joachim ; Paar, Dalibor ; Manthey, Katarina ; Curro, Nicholas ; Behr, Günther ; Werner, Jochen ; Büchner, Bernd

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Verhandlungen der Deutschen Physikalischen Gesellschaft

Mjesto i datum
Dresden, Njemačka, 22.03.2009. - 27.03.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
iron pnictides; NMR

Sažetak
We have performed 75As, 139La, and 57Fe Nuclear Magnetic Resonance (NMR) measurements on the new LaO1− xFxFeAs superconductor. For x=0.1, NMR on all three nuclei shows that the local electronic susceptibility increases with increasing temperature in the normal state. The scaling of all NMR shifts with respect to the macroscopic susceptibility indicates a single spin liquid. Relaxation measurements exhibit a similar temperature-dependence for (T1T)− 1, and suggest that the dynamical susceptibility changes uniformly in q space with varying temperature. For x=0.05, in the underdoped regime, we find a Curie Weiss like increase of (T1T)− 1 at low temperatures, indicating the onset of local moment fluctuations.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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