Magneto-elastically coupled structural, magnetic and superconducting order parameters in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$

Abstract

We measure the transport properties of mechanically strained single crystals of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ over a wide range of $x$. The Néel transition is extremely sensitive to stress and this sensitivity increases as optimal doping is approached, even though the transition itself is strongly suppressed. Furthermore, we observe significant changes in the superconducting transition temperature with applied strain, which mirror changes as a function of the composition $x$. These experiments are a direct illustration of the intimate coupling between different degrees of freedom in iron-based superconductors, revealing the importance of magneto-elastic coupling to the magnetic and superconducting transition temperatures.

7 pages, 7 Figures and 4 appendices

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