Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals

M. S. Torikachvili; S. L. Bud'ko; N. Ni; P. C. Canfield

doi:10.1103/PhysRevB.78.104527

paper

Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals

arXiv:0809.1080 · doi:10.1103/PhysRevB.78.104527

Abstract

The effects of pressure up to $\sim 20$ kbar, on the structural phase transition of SrFe $_{2}$ As $_{2}$ and lightly Sn-doped BaFe $_{2}$ As $_{2}$ , as well as on the superconducting transition temperature and upper critical field of (Ba $_{0.55}$ K $_{0.45}$ )Fe $_{2}$ As $_{2}$ single crystals have been studied. All the transition temperatures decrease with pressure in an almost linear fashion. Under pressure, the upper critical field curve, $H_{c 2} (T)$ , for (Ba $_{0.55}$ K $_{0.45}$ )Fe $_{2}$ As $_{2}$ shifts down in temperature to follow the zero field $T_{c}$ with very little change in slope. Composite $P - T$ phase diagrams for three parent compounds, AFe $_{2}$ As $_{2}$ (A = Ba, Sr, Ca), are constructed and appear to be remarkably similar: (i) having a structural (antiferromagnetic) phase transition line with a negative slope and (ii) showing signs of the emerging superconducting state at intermediate pressures.

Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals

Abstract

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