Possible re-entrant superconductivity in EuFe2As2 under pressure

Abstract

We studied the temperature-pressure phase diagram of EuFe2As2 by measurements of the electrical resistivity. The antiferromagnetic spin-density-wave transition at T_0 associated with the FeAs-layers is continuously suppressed with increasing pressure, while the antiferromagnetic ordering temperature of the Eu 2+ moments seems to be nearly pressure independent up to 2.6 GPa. Above 2 GPa a sharp drop of the resistivity, ρ(T), indicates the onset of superconductivity at T_c \approx 29.5 K. Surprisingly, on further reducing the temperature ρ(T) is increasing again and exhibiting a maximum caused by the ordering of the Eu 2+ moments, a behavior which is reminiscent of re-entrant superconductivity as it is observed in the ternary Chevrel phases or in the rare-earth nickel borocarbides.

References in corpus (13)

• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide
• Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
• Antiferromagnetic transition in EuFe${}_2$As${}_2$: A possible parent compound for superconductors
• Transport and anisotropy in single-crystalline SrFe${}_2$As${}_2$ and $A_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ ($A$ = Sr, Ba) superconductors
• Strong coupling between magnetic and structural order parameters in SrFe2As2
• Effect of pressure on the magnetostructural transition in SrFe2As2

Cited by in corpus (3)

• EuFe${}_2$As${}_2$ under high pressure: an antiferromagnetic bulk superconductor
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• Interplay between superconductivity and magnetism in K-doped EuFe2As2