Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex
S. Imajo, H. Akutsu, R. Kurihara, T. Yajima, Y. Kohama, M. Tokunaga, K. Kindo, Y. Nakazawa
DOI 10.1103/PhysRevLett.125.177002 · Physical Review Letters
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Abstract
We investigate low-temperature electronic properties of the nondimeric organic superconductor β′′−(ET)4[(H3O)Ga(C2O4)3]PhNO2. By examining ultrasonic properties, charge disproportionation (CD) without magnetic field dependence is detected below TCD∼8 K just above the superconducting critical temperature Tc∼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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| β''-(ET)4[(H3O)Ga(C2O4)3]PhNO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
| β''-(ET)4[(H3O)Ga(C2O4)3]PhNO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | onset |
| β''-(ET)2SF5CH2CF2SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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