75As Nuclear Magnetic Resonance studies of superconducting LaO1-xFxFeAs (CROSBI ID 541038)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Grafe, Hans-Joachim ; Paar, Dalibor ; Lang, Guillaume ; Wolter, Anja ; Manthey, Katarina ; Hammerath, Franziska ; Curro, Nick J. ; Büchner, Bernd
engleski
75As Nuclear Magnetic Resonance studies of superconducting LaO1-xFxFeAs
We have performed 75As Nuclear Magnetic Resonance (NMR* and Nuclear Quadrupole Resonance (NQR* measurements on powders and aligned powders of the new LaO 1-x FxFeAs superconductor [1]. In the normal state, we find a strong doping dependence of the As NQR frequency that increases with increasing F doping, similar to the 17O quadrupole frequency in the high Tc cuprates, suggesting that the As quadrupole frequency is a measure of the charge carrier doping. From the As NMR experiments on aligned powders, we find a strong temperature dependence of the spin shift and Korringa behavior of the spin lattice relaxation rate. In the superconducting state, we find evidence for line nodes in the superconducting gap and spin-singlet pairing. Our measurements reveal a strong anisotropy of the spin lattice relaxation rate, which suggest that superconducting vortices contribute to the relaxation rate when the field is parallel to the c-axis but not for the perpendicular direction.
high temperature superconductivity; pseudogap; nuclear magnetic resonance and relaxation; oxypnictides
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Podaci o prilogu
75-75.
2008.
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objavljeno
Podaci o matičnoj publikaciji
6th INTERNATIONAL CONFERENCE OF THE STRIPES SERIES, Quantum Phenomena in Complex Matter
Bianconi, A
Erice: SUPERSTRIPES-ONLUS and ETTORE MAJORANA FOUNDATION AND CENTRE FOR SCIENTIFIC CULTURE
Podaci o skupu
6th INTERNATIONAL CONFERENCE OF THE STRIPES SERIES, Quantum Phenomena in Complex Matter
predavanje
26.07.2008-01.08.2008
Erice, Italija