Single crystal growth and physical properties of SrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$

TL;DR

This study reports the growth of SrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ single crystals, revealing a maximum superconducting transition temperature at a specific phosphorus concentration and evidence of a magnetic quantum critical point.

Contribution

It presents a new method for growing high-quality single crystals of SrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ and characterizes their superconducting and electronic properties across different compositions.

Findings

Maximum $T_c$ of 30 K at $x=0.35$

Transition from non-Fermi liquid to Fermi liquid behavior with increasing $x$

Evidence of a magnetic quantum critical point around $x=0.35$

Abstract

We report a crystal growth and physical properties of SrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$. The single crystals for various $x$s were grown by a self flux method. For $x = 0.35$, $T_c$ reaches the maximum value of 30\,K and the electrical resistivity $\rho$($T$) shows $T$-linear dependence. As $x$ increases, $T_{c}$ decreases and $\rho$($T$) changes to $T^2$-behavior, indicating a standard Fermi liquid. These results suggest that a magnetic quantum critical point exists around $x=0.35$.