Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.75: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

¹³⁹La-NMR in the T^′-La₂CuO₄ antiferromagnetic phase — •Marco Günther¹, Katharina Weber¹, 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

We study the antiferromagnetic ordered phase of T^′-La₂CuO₄, a recently synthesized parent compound of electron doped cuprate superconductors by means of I=7/2 ¹³⁹La-NMR spectroscopy and powder spectra simulation.

The observed field sweep spectra at temperatures range between 10-240 K are compared with simulations of the combined nuclear Zeeman- and quadrupole-hamiltonian. In this approach the experimentally found line broadening arises from a local hyperfine field parallel to the copper-oxygen planes and is interpreted as the order parameter showing magnetic order below 207 K. We construct the hyperfine fields in a local electronic antiferromagnetic dipole model. Our results are compared to other local probe experiments on parent compounds of cuprate superconductors.