Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.29: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

SrCo₂P₂: a rare case of strong T dependence in the uncorrelated electronic DOS — •Christoph Bergmann, Helge Rosner, Yurii Prots, and Christoph Geibel — Max Planck Institut Chemical physics of solids, Dresden, Germany

Since the discovery of high temperature superconductivity in doped RFeAsO, transition metal pnictides have attracted considerable attention, especially those being close to a transition from a magnetic ordered to a non-magnetic ground state. SrCo₂P₂, a structural homologue of the AFe₂As₂ series of compounds, is such a system. Earlier investigation on polycrystals indicated a paramagnetic ground state, but a close proximity to magnetic ordering. Using a flux technique, we grew high quality single crystals with a residual resistivity ratio up to 150, and performed an in-depth study of the physical properties. Despite DFT calculation indicate a pronounced peak in the density of states at the Fermi level prone for electronic instability. We did not find any evidence for a phase transition. However we observed a quite unusual temperature dependence of the susceptibility with two distinct maxima, and Non-Fermi-liquid behavior in the resistivity at low temperature. Temperature dependent x-ray scattering experiments reveal an unusual behavior of the structural parameters, which induces a strong temperature dependence of the DOS at the Fermi edge. This provides a mechanism for the low temperature maximum, observed in the magnetic susceptibility.