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Toss in a Little Ruthenium, Apply Pressure and Voilà!

Researchers working to understand high temperature superconductivity in barium-iron-arsenide have discovered that applying pressure affects the material's magnetic and superconducting behavior just as if they had replaced some iron with a little ruthenium. To better quantify and understand the similarities of changing pressure versus ruthenium concentration, they made Ba(Fe1-xRux)2As2 with varying amounts (x) of ruthenium and studied each concentration as a function of pressure and temperature. The temperature-pressure phase diagrams showed this scaling is remarkably simple; every 3 GigaPascals of pressure, 30 times the pressure in the deepest part of the ocean, is roughly equivalent to replacing 10% of the iron with ruthenium. By comparing the various phase diagrams they were also able to show what is required for this material to reach its highest superconducting temperature.

Article Title: 

Combined Effects of Pressure and Ru Substitution on BaFe2As2

S. K. Kim, M. S. Torikachvili, E. Colombier, A. Thaler, S. L. Bud’ko and P. C. Canfield
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Journal Name: 
Physical Review B
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