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Tytuł:
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Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex.
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Autorzy:
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Imajo S; The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan.; Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
Akutsu H; Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
Kurihara R; The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Yajima T; The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Kohama Y; The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Tokunaga M; The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Kindo K; The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Nakazawa Y; Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
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Źródło:
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Physical review letters [Phys Rev Lett] 2020 Oct 23; Vol. 125 (17), pp. 177002.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: New York : American Physical Society
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Entry Date(s):
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Date Created: 20201106 Latest Revision: 20201110
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Update Code:
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20240105
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DOI:
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10.1103/PhysRevLett.125.177002
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PMID:
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33156658
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We investigate low-temperature electronic properties of the nondimeric organic superconductor β^{''}-(ET)_{4}[(H_{3}O)Ga(C_{2}O_{4})_{3}]PhNO_{2}. By examining ultrasonic properties, charge disproportionation (CD) without magnetic field dependence is detected below T_{CD}∼8 K just above the superconducting critical temperature T_{c}∼6 K. From quantum oscillations in high fields, we find variation in the Fermi surface and mass enhancement induced by the CD. Heat capacity studies elucidate that the superconducting gap function is fully gapped in the Fermi surface, but anisotropic with fourfold symmetry. We point out that the pairing mechanism of the superconductivity is possibly dominated by charge fluctuations.
