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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.36: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Pressure induced magnetic ordering in SrCo₂P₂ — •Helge Rosner, Sarah Ackerbauer, Christoph Bergmann, Moritz Besser, Michael Nicklas, and Christoph Geibel — MPI CPfS, Dresden, Germany

Since the discovery of superconductivity in doped iron pniktides, in particular the AFe₂As₂ systems of the ThCr₂Si₂ structure type, the intricate interplay of crystal structure, magnetism and superconductivity in these compounds has attracted broad attention. It is widely believed that the superconductivity of this compound family is closely related tho spin fluctuations. SrCo₂P₂ is a structural homologue of the AFe₂As₂ compound series, exhibiting a paramagnetic ground state, but in close vicinity to a quantum critical point. In our joined experimental and theoretical study we demonstrate that under hydrostatic pressure the system undergoes an isostructural transition to the so-called tetragonal collapsed state with a strongly reduced c/a ratio by about 15%. Surprisingly, this transition is accompanied by magnetic ordering, indicated by a magnetic-field-dependent kink in the resistivity. Our results are supported by density functional electronic structure calculations.