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Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: SC: Fabrication and Characterization

TT 15.1: Talk

Monday, March 14, 2011, 16:30–16:45, HSZ 301

Enhanced two-dimensional behavior of metastable T-La2CuO4, the parent compound of electron-doped cuprate superconductors — •Alexander Buckow1, Roland Hord2, Hubertus Luetkens3, Gwendolyne Pascua3, Kathrin Hofmann2, Jose Kurian1, Vladimir Pomjakushin4, Andreas Suter3, Barbara Albert2, and Lambert Alff11Institute of Materials Science, TU Darmstadt — 2Eduard-Zintl-Institute, TU Darmstadt — 3Laboratory for Muon Spin Spectroscopy, PSI — 4Laboratory for Neutron Scattering, PSI

We synthesized crystalline bulk samples of lanthanum cuprate in the metastable T phase using cesium hydroxide flux. Its crystal structure was determined as space group I4/mmm, no. 139, a = 401.02 pm, c = 1252.66 pm. Muon spin rotation reveals a gradual slowing down of magnetic order below TN2 = 115 K, in sharp contrast to La2CuO4 in the T structure where TN1 ≈ TN2 ≈ 300 K. Our result shows that the strikingly different magnetic behavior of the two parent compounds has its origin in the two crystal structure modifications. In addition, we find that T-La2CuO4 has strongly reduced magnetic interactions compared to the other T materials Nd2CuO4 and Pr2CuO4, where Nd3+ and Pr3+ are magnetic ions in contrast to the nonmagnetic La3+.
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).

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