Our studies unambiguously show that the Fe-vacancy ordered K 2 Fe 4 Se 5 is the magnetic, Mott insulating parent compound of the superconducting state. ![]() In the high-Tc potassium intercalated FeSe, there has been significant debate regarding what the exact parent compound is. E-mail: 2Ībstract: The parent compound of an unconventional superconductor must contain unusual correlated electronic and magnetic properties of its own. Institute of Physics, Academia Sinica, Taipei, Taiwan Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 3 Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 4 Institute of Astrophysics and Astronomy, Academia Sinica, Taipei, Taiwan 5 Deparment of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA 6 National Donghwa University, Hualien, Taiwan *These authors contributed equally to this work. ![]() Wu5 and Maw-Kuen Wu1,3,6† Affiliations: 1 Disordered Fe vacancies and superconductivity in potassium-intercalated iron selenide (K 2-x Fe 4+y Se 5 ) Chih-Han Wang1,2*, Ta-Kun Chen1*, Chung-Chieh Chang1, Chia-Hao Hsu1, Yung-Chi Lee1,3, Ming-Jye Wang4, Phillip M.
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