Abstract
This review focuses on the growth of high-quality (Li1−xFex)OHFeSe single crystals by a hydrothermal method using floating-zone-grown AxFe2−ySe2 (A = K, Rb, and Cs) as precursors. The structure, superconductivity, and magnetic behavior of the obtained crystals are highly influenced by the growth conditions, such as time, temperature, and composition. A phase diagram with temperature against the c-lattice constant is summarized including the antiferromagnetic spin density wave, superconducting, and paramagnetic phases.
Highlights
Iron-based superconductors (FeSCs) have attracted much attention because of their diverse structures, complex phases, and unconventional superconductivity [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
Soon after the synthesis of polycrystalline (Li1−x Fex )OHFeSe via a hydrothermal method, (Li1−x Fex )OHFeSe single crystals with Tc above 44 K were successfully synthesized via a hydrothermal ion-exchange process using Ax Fe2−y Se2 (A = K, Rb, and Cs) as precursors, in which the 245 phase is absent [53]
Using the same hydrothermal synthesis route, all (Li1−x Fex )OHFeSe crystals have been synthesized with high superconductive shielding fraction and high Tc, despite the A0.80 Fe1.81 Se2 (A = K, Rb, and Cs) precursors having significantly different properties that vary from being a good superconductor, to an insulator, and to a poor superconductor
Summary
Iron-based superconductors (FeSCs) have attracted much attention because of their diverse structures, complex phases, and unconventional superconductivity [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]. Tc reaches as high as 55 K and 56 K in SmO1−x Fx FeAs and Sr1−x Smx FFeAs, respectively [31,32] Since their discovery, iron-selenide SCs have been found to provide a strong platform for the investigation of their high-Tc superconductivity, since they possess a simple structure, are nontoxic, and may be fabricated via numerous synthesis methods [2,18,33,34]. Soon after the synthesis of polycrystalline (Li1−x Fex )OHFeSe via a hydrothermal method, (Li1−x Fex )OHFeSe single crystals with Tc above 44 K were successfully synthesized via a hydrothermal ion-exchange process using Ax Fe2−y Se2 (A = K, Rb, and Cs) as precursors, in which the 245 phase is absent [53] They have a narrow SC transition and 100% shield volume fractions, indicating their excellent bulk superconductivity; in contrast, the shield fractions of. We review the growth technology, structure, and physical properties of (Li1−x Fex )OHFeSe single crystals
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