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

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, $H_{c2}(T)$, 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.

References in corpus (9)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• First order structural phase transition in CaFe${}_2$As${}_2$
• Structural transition and anisotropic properties of single crystalline SrFe2As2
• Effect of pressure on the superconducting critical temperature of La[O_{0.89}F_{0.11}]FeAs and Ce[O_{0.88}F_{0.12}]FeAs

Cited by in corpus (11)

• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• Water-induced superconductivity in SrFe2As2
• Superconductivity induced by ruthenium substitution in an iron arsenide: investigation of SrFe2-xRuxAs2 (0 <= x <= 2)
• Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
• Effect of pressure on the magnetostructural transition in SrFe2As2
• The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
• Character of magnetic instabilities in CaFe2As2
• Anharmonic softening of Raman active phonons in Iron-Pnictides; estimating the Fe isotope effect due to anharmonic expansion