The interplay of electron doping and chemical pressure in Ba(Fe(1-y)Coy)2(As(1-x)Px)2

Abstract

The effects of internal chemical pressure on electron doped iron arsenide superconductors are studied in the series Ba(Fe(1-y)Coy)2(As(1-x)Px)2. Combinations of both dopants induce superconductivity also in such areas where only one would not suffice, and can likewise move the system into an overdoped state, while no higher critical temperature than 31 K in BaFe2(As(1-x)Px)2 was found. The phase diagram gives no evidence of holes in BaFe2(As(1-x)Px)2 as suggested by recent photoemission experiments. Chemical and physical pressure act similarly in Ba(Fe(1-y)Coy)2(As(1-x)Px)2, but our data reveal that the most important control parameter is the length of the Fe-As bond and not the unit cell volume. This emphasizes that differences between chemical and physical pressure which manifest oneself as the non-linear reduction of the Fe-As distance in BaFe2(As(1-x)Px)2 are strongly linked to the superconducting properties also in the Co doped compounds.

11 pages, 10 figures

References in corpus (5)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• 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
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Thermal expansion and anisotropic pressure derivatives of T_c in Ba(Fe_{1-x}Co_x)_2As_2 single crystals

Cited by in corpus (4)

• Thermodynamic phase diagram and phase competition in BaFe2(As1-xPx)2 studied by thermal expansion
• Coincident structural and magnetic order in BaFe${}_2$(As${}_{1-x}$)P${}_x$)${}_2$ revealed by high-resolution neutron diffraction
• Manipulation of gap nodes by uniaxial strain in iron-based superconductors
• Phase diagram of the isovalent phosphorous-substituted 122-type iron pnictides