2010/05/08 by J. Gillett, Sitikantha D. Das, Gillett, Jack +11
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Rare-earth and actinide compounds
paper · pdf · doi:10.48550/arxiv.1005.1330
A phase diagram of superconducting Sr(Fe1-xCox)2As2 as a function of doping (x) is determined by a series of thermodynamic and transport measurements on single crystals. On comparison with a similar phase diagram for Ba(Fe1-xCox)2As2 (Co-doped Ba122), we find that the increased dimensionality of Co-doped Sr122 results in a single first-order-like transition where the magnetic and structural transitions coincide, unlike the case of Co-doped Ba122 that exhibits split quasicontinuous magnetic and structural transitions. We relate this dimensionally-tuned splitting in the magnetic and structural transitions to the relative size of superconducting temperatures in these materials.