Global Phase Diagram of the Magnetic Field-Induced Organic Superconductors λ-(BETS)2FexGa1−xCl4

Shinya Uji; Taichi Terashima; Chieko Terakura; Taro Yakabe; Yoshikazu Terai; Syuma Yasuzuka; Yasutaka Imanaka; Madoka Tokumoto; Akiko Kobayashi; Fumiko Sakai; Hisashi Tanaka; Hayao Kobayashi; Luis Balicas; James S. Brooks

doi:10.1143/jpsj.72.369

Global Phase Diagram of the Magnetic Field-Induced Organic Superconductors λ-(BETS)₂Fe_xGa_1−xCl₄

Shinya Uji, Taichi Terashima, Chieko Terakura, Taro Yakabe, Yoshikazu Terai, Syuma Yasuzuka, Yasutaka Imanaka, Madoka Tokumoto, Akiko Kobayashi, Fumiko Sakai, Hisashi Tanaka, Hayao Kobayashi, Luis Balicas, James S. Brooks

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Keywords: Organic conductor, superconductivity, Jaccarino-Peter effect, high magnetic field

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2003 Volume 72 Issue 2 Pages 369-373

DOI https://doi.org/10.1143/jpsj.72.369

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Abstract

Organic alloys λ-(BETS)₂Fe_xGa_1−xCl₄ show superconductivity only under very high magnetic fields parallel to the conducting layer for x≥0.47. As x decreases, the field induced superconducting phase shifts towards lower fields and a striking field-induced insulator to superconductor transition is observed below 4 T for x=0.45. We show that the overall features of the global phase diagram are well understood in terms of Jaccarino-Peter compensation mechanism. These results provide a new road map for the future design of high magnetic field superconductors.

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