Transport properties and anisotropy in rare earth doped CaFe2As2 single crystals with Tc above 40 K

Abstract

In this paper we report the superconductivity above 40 K in the electron doping single crystal Ca1-xRexFe2As2 (Re = La, Ce, Pr). The x-ray diffraction patterns indicate high crystalline quality and c-axis orientation. the resistivity anomaly in the parent compound CaFe2As2 is completely suppressed by partial replacement of Ca by rare earth and a superconducting transition reaches as high as 43 K, which is higher than the value in electron doping FeAs-122 compounds by substituting Fe ions with transition metal, even surpasses the highest values observed in hole doping systems with a transition temperature up to 38 K. The upper critical field has been determined with the magnetic field along ab-plane and c-axis, yielding the anisotropy of 2~3. Hall-effect measurements indicate that the conduction in this material is dominated by electron like charge carriers. Our results explicitly demonstrate the feasibility of inducing superconductivity in Ca122 compounds via electron doping using aliovalent rare earth substitution into the alkaline earth site, which should add more ingredients to the underlying physics of the iron-based superconductors.

21 pages, 7 figures

References in corpus (22)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• The superconductivity at 18 K in LiFeAs system
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• First order structural phase transition in CaFe${}_2$As${}_2$
• Critical Fields and Anisotropy of NdO0.82F0.18FeAs Single Crystals
• Synthesis and Properties of CaFe${}_2$As${}_2$ Single Crystals
• Structural collapse and superconductivity in rare earth-doped CaFe2As2
• The Unusual Superconducting State at 49 K in Electron-Doped CaFe2As2 at Ambient
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• High-T_c superconductivity induced by doping rare earth elements into CaFeAsF
• Anisotropic magnetic and superconducting properties of pure and Co-doped CaFe${}_2$As${}_2$ single crystals
• Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2
• Transport properties and superconductivity in $B{a}_{1-x}{M}_{x}F{e}_{2}A{s}_2$ (M=La and K) with double FeAs layers
• Fully Band Resolved Scattering Rate in MgB2 Revealed by Nonlinear Hall Effect and Magnetoresistance Measurements
• Synthesis and properties of La-doped CaFe2As2 single crystals with Tc = 42.7 K

Cited by in corpus (13)

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• Nanoscale Surface Element Identification and Dopant Homogeneity in the High-$T_c$ Superconductor Pr${}_x$Ca${}_{1-x}$Fe${}_2$As${}_2$
• Evidence for Defect-induced Superconductivity up to 49 K in (Ca1-xRx)Fe2As2
• Coexistence of two superconducting phases in Ca1-xLaxFe2As2
• Transport and magnetic properties of La-doped CaFe${}_2$As${}_2$
• Pressure-induced Superconductivity in Zintl Topological Insulator SrIn2As2
• First-principles study of superconducting Rare-earth doped CaFe2As2
• Superconducting Properties and Phase Diagram of Indirectly Electron-Doped (Sr1-xLax)Fe2As2 Epitaxial Films Grown by Pulsed Laser Deposition
• Phase Diagram and Weak-link Behavior in Nd-doped CaFe_2As_2
• Drastic electronic structure reconstruction of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$ in the collapsed tetragonal phase
• High Pressure Effects on the Superconductivity in Rare-Earth Doped CaFe2As2