Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 35: Correlated Electrons: Quantum-Critical Phenomena - Experiment I

TT 35.8: Vortrag

Dienstag, 1. April 2014, 11:30–11:45, HSZ 204

Single crystal study of SrCo₂P₂: an unusual spin fluctuating system — •Christoph Bergmann, Christoph Geibel, Helge Rosner, and Deepa Kasinathan — Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden Deutschland

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 140, and performed an in-depth study of the physical properties. Despite LDA 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 T dependence of the susceptibility with two distinct maxima, and Non-Fermi-liquid behavior in the resistivity at low T. Both features confirm SrCo₂P₂ to be a rather unusual spin fluctuating system close to a (quantum) critical point.