Superconductivity and Magnetic Properties of high-quality single crystals of $A_x$Fe${}_2$Se${}_2$ ($A$ = K and Cs)

Abstract

We successfully grew the high-quality single crystals of $A_x$Fe${}_2$Se${}_2$ ($A$ = K and Cs) by self-flux method. Sharp superconducting transition was observed for both types of crystals. The crystals show the onset superconducting transition temperatures ($T_{\mathrm{c}}$) of 31 K and 30 K for K- and Cs-compounds, respectively, with nearly 100% shielding fraction. The crystals show quite high resistivity in the normal state of more than 160 m$\Omega$ cm and 1300 m$\Omega$ cm maximum resistivity for $K_{0.86}F{e}_{2}S{e}_{1.82}$ and $C{s}_{0.86}F{e}_{1.66}S{e}_2$ single crystals, respectively. Much larger upper critical field $H_{c2}$ is inferred from low-temperature iso-magnetic-field magnetoresistance in these crystals than in FeSe. The anisotropy $H_{c2}^{ab}$(0)/$H_{c2}^c$(0) is around 3 for both of the two materials. Anisotropic peculiar magnetic behavior in normal state has been found for $C{s}_{0.86}F{e}_{1.66}S{e}_2$

arXiv comment5 pages, 5 figs

References in corpus (25)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• 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
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Pressure evolution of low-temperature crystal structure and bonding of 37 K $T_c$ FeSe superconductor
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Anion height dependence of Tc for the Fe-based superconductor
• Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Superconductivity at 32 K in single crystal Rb${}_{0.78}$Fe${}_2$Se${}_{1.78}$}
• Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor with Tc=27K
• Microstructure and Fe-vacancy ordering in the KFexSe2 superconducting system
• Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs
• Critical Fields and Anisotropy of NdO0.82F0.18FeAs Single Crystals
• Pressure-induced high-Tc superconducting phase in FeSe: correlation between anion height and Tc
• Upper critical field, anisotropy, and superconducting properties of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Weak anisotropy of the superconducting upper critical field in Fe1.11Te0.6Se0.4 single crystals
• Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc = 33 K)
• High temperature superconductivity (Tc onset at 34K) in the high pressure orthorhombic phase of FeSe
• Superconducting and normal phases of FeSe single crystals at high pressure
• Crystal structure, physical properties and superconductivity in $A_x$Fe${}_2$Se${}_2$ single crystals
• Room temperature antiferromagnetic order in superconducting X_yFe_{2-x}Se_ 2, (X= Rb, K): a powder neutron diffraction study

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