Details

Autor(en) / Beteiligte

• Imajo, S
• Akutsu, H
• Kurihara, R
• Yajima, T
• Kohama, Y
• Tokunaga, M
• Kindo, K
• Nakazawa, Y

Titel

Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex

Ist Teil von

• Physical review letters, 2020-10, Vol.125 (17), p.1-177002, Article 177002

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

PROLA

Beschreibungen/Notizen

• 1We 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.