Anisotropic magnetism, resistivity, London penetration depth and magneto-optical imaging of superconducting K0.80Fe1.76Se2 single crystals

Abstract

Single crystals of K0.80Fe1.76Se2.02 were suscessfully grown from a ternary solution. We show that although crystals form when cooling a near stoichiometric melt, crystals are actually growing out of a ternary solution that remains liquid to at least 850 C. We investigated their chemical composition, anisotropic magnetic susceptibility and resistivity, specific heat, thermoelectric power, London penetration depth and flux penetration via magneto-optical imaging. Whereas the samples appear to be homogeneously superconducting at low temperatures, there appears to be a broadened transtion range close to Tc ~ 30 K that may be associated with small variations in stociometry.

7 pages, 7 figures

References in corpus (19)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• High-temperature superconductivity in iron-based materials
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• The superconductivity at 18 K in LiFeAs system
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• 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
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Magnetic Penetration Depth in Unconventional Superconductors
• Magnetism in Fe-based superconductors
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• Superconductivity in SrFe_(2-x)Co_xAs_2: Internal Doping of the Iron Arsenide Layers
• Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals
• Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc = 33 K)
• (Sr_3Sc_2O_5)Fe_2As_2 as a possible parent compound for FeAs-based superconductors
• Intrinsic magnetic properties of NdFeAsO${}_{0.9}$F${}_{0.1}$ superconductor from local and global measurements
• Anomalous Meissner effect in pnictide superconductors
• Investigation of resonant and transient phenomena in Josephson junction flux qubits

Cited by in corpus (12)

• Coexistence of Superconductivity and Magnetism in FeSe_1-x under Pressure
• Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations
• Strong anisotropy in nearly ideal-tetrahedral superconducting FeS single crystals
• The intercalation chemistry of layered iron chalcogenide superconductors
• Intrinsic Percolative Superconductivity in KxFe2-ySe2 Single Crystals
• Evolution of precipitate morphology during heat treatment and its implications for the superconductivity in KxFe1.6+ySe2 single crystals
• Superconducting properties of single-crystalline A_{x}Fe_{2-y}Se_{2} (A=Rb, K) studied using muon spin spectroscopy
• Giant increase in critical current density of KxFe2-ySe2 single crystals
• Metastable superconducting state in quenched KxFe2-ySe2
• Reversibly tuning the insulating and superconducting state in KxFe2-ySe2 crystals by post-annealing
• Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor
• Critical current density and mechanism of vortex pinning in KxFe2-ySe2 doped with S