Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Correlated Electrons: Low-dimensional Systems - Materials 3
TT 40.4: Vortrag
Donnerstag, 29. März 2012, 15:45–16:00, H 0104
NMR measurements on T′-La2CuO4, a parent compound of electron-doped cuprate superconductors — •Katharina Weber1, Marco Günther1, Hubertus Luetkens2, Gwendolyne Pascua2, Roland Hord3, Barbara Albert3, Lambert Alff4, and Hans-Henning Klauß1 — 1Institut für Festkörperphysik, TU Dresden — 2Laboratory for Muon Spin Spectroscopy, PSI — 3Eduard-Zintl-Institut, TU Darmstadt — 4Institute of Materials Science, TU Darmstadt
The study of La2CuO4 in the metastable T′ phase
is important for the understanding of the cuprate superconductors,
for it allows a direct comparison to its counterpart
T-La2CuO4, a parent compound of hole-doped cuprates.
We present our mircoscopic study of the antiferromagnetically ordered phase of
T′-La2CuO4. Pulsed 139La-NMR was used to obtain spectra and relaxation rates
in a temperature range from 10 to 240 K in an external field of about 5 T.
The comparison of the spectra to a simulation
allows us to determine the hyperfine field on the La site.
The NMR measurements reveal static magnetic order below TN= 207 K
in contrast to previous moun spin rotation experiments on the same sample,
indicating static order below 115 K [1]. However the NMR spin-lattice relaxation rates
imply a change of spin dynamics at 120 K.
R. Hord, H. Luetkens, G. Pascua, A. Buckow, K. Hofmann,
Y. Krockenberger, J. Kurian, H. Maeter, H.-H. Klauss, V. Pomjakushin,
A. Suter, B. Albert, and L. Alff, Phys. Rev. B 82, 180508(R)
(2010).