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Visualization of the electronic phase separation in superconducting K_(x)Fe_(2−y)Se_(2)

Nano Research 2021年第3期14卷 823-828页

作者： Yujie Chen Juan Jiang Haifeng Yang Pavel Dudin alexey barinov Zhongkai Liu Haihu Wen Lexian Yang Yulin Chen State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing100084China Department of Physics Clarendon LaboratoryUniversity of OxfordParks RoadOxfordOX13PUUK Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA94720USA School of Physical Science and Technology ShanghaiTech University and CAS-Shanghai Science Research CenterShanghai201210China L’Orme des Merisiers Synchrotron SOLEILSaint Aubin-BP 4891192Gif sur Yvette CedexFrance Elettra-Sincrotrone Trieste TriesteBasovizza34149Italy ShanghaiTech Laboratory for Topological Physics Shanghai200031China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing210093China Frontier Science Center for Quantum Information Beijing100084China

Type-II iron-based superconductors(Fe-SCs),the alkali-metal-intercalated iron selenide A_(x)Fe_(2−y)Se_(2)(A=K,Tl,Rb,etc.)with a superconducting transition temperature of 32 K,exhibit unique properties such as high Néel temperature,Fe-vacancies ordering,antiferromagnetically ordered insulating state in the phase diagram,and mesoscopic phase separation in the superconducting *** particular,the electronic and structural phase separation in these systems has attracted intensive attention since it provides a platform to unveil the insulating parent phase of type-II Fe-SCs that mimics the Mott parent phase in *** this work,we use spatial-and angle-resolved photoemission spectroscopy to study the electronic structure of superconducting K_(x)Fe_(2−y)Se_(2).We observe clear electronic phase separation of K_(x)Fe_(2−y)Se_(2) into metallic islands and insulating matrix,showing different K and Fe *** the metallic islands show strongly dispersive bands near the Fermi level,the insulating phase shows an energy gap up to 700 meV and a nearly flat band around 700 meV below the Fermi energy,consistent with previous experimental and theoretical results on the superconducting K_(1−x)Fe_(2)Se_(2)(122 phase)and Fe-vacancy ordered K_(0.8)Fe_(1.6)Se_(2)(245 phase),*** results not only provide important insights into the mysterious composition of phase-separated superconducting and insulating phases of K_(x)Fe_(2−y)Se_(2),but also present their intrinsic electronic structures,which will shed light on the comprehension of the unique physics in type-II Fe-SCs.

关键词： spatial-and angle-resolved photoemission spectroscopy(µ-ARPES) iron-based superconductors phase separation electronic structure

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