Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.25: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Synthesis, structural characterization and superconductivity in La₂Sb — •Stephan Knöner, Elena Gati, Markus Kuhnt, Mariano de Souza, Amir Haghighirad, Wolf Aßmus, and Michael Lang — Physikalisches Institut, Goethe-Universität, D-60438 Frankfurt(M), Germany

The discovery of superconductivity in Fe-pnictides has attracted enormous interest to this class of materials [1]. In this contribution, we report on synthesis, structural characterization and magnetic properties of La₂Sb. So far, only little is known on the superconductivity of La₂Sb [2]. This compound possesses a layered quasi-2D structure and crystallizes in a tetragonal structure with space group I4/mmm, which is isostructural to the 122-family of the iron pnictides. Since La₂Sb does not contain magnetic ions, it may serve as a reference material to explore the role of magnetic and structural degrees of freedom for superconductivity in iron-pnictides. EPMA and x-ray analyses indicate the phase purity of the samples, which show a superconducting transition at 4.6 K. We will discuss transport and magnetic properties of polycrystalline La₂Sb samples as a function of temperature and will address the effect of hydrostatic pressure.
Y. Kamihara et al., J. Am. Chem. Soc. 130, 3296 (08)
H. Mizoguchi and H. Hosono, Chem. Commun., 47, 3778 (11)