Complete pressure dependent phase diagrams for SrFe2As2 and BaFe2As2 - Condensed Matter > SuperconductivityReport as inadecuate

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Abstract: The temperature dependent electrical resistivity of single crystallineSrFe2As2 and BaFe2As2 has been measured in a liquid medium, modified Bridgmananvil cell for pressures in excess of 75 kbar. These data allow for thedetermination of the pressure dependence of the higher temperature, structural- antiferromagnetic phase transitions as well as the lower temperaturesuperconducting phase transition. For both compounds the ambient pressure,higher temperature structural - antiferromagnetic phase transition can be fullysuppressed with a dome-like region of zero resistivity found to be centeredabout its critical pressure. Indeed, qualitatively, the temperature dependenceof the resistivity curves closest to the critical pressures are the closest tolinear, consistent with possible quantum criticality. For pressuressignificantly higher than the critical pressure the zero resistivity state issuppressed and the low temperature resistivity curves asymptotically approach auniversal, low temperature manifold. These results are consistent with thehypothesis that correlations - fluctuations associated with theambient-pressure, high-temperature, tetragonal phase have to be brought to lowenough temperature to allow superconductivity, but if too fully suppressed canlead to the loss of the superconducting state.

Author: E. Colombier, S. L. Bud'ko, N. Ni, P. C. Canfield


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