Structure sequence and possible superconductivity in potassium-doped fullerene C70Kx

Mototada Kobayashi; Yuichi Akahama; Haruki Kawamura; Hisanori Shinohara; Hiroyasu Sato; Yahachi Saito

doi:10.1103/PhysRevB.48.16877

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Structure sequence and possible superconductivity in potassium-doped fullerene C70Kx

Mototada Kobayashi, Yuichi Akahama, Haruki Kawamura, Hisanori Shinohara, Hiroyasu Sato, Yahachi Saito

DOI 10.1103/PhysRevB.48.16877 · Physical Review B

T1

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Abstract

A sequence of doped fcc or doped rhombohedral, bct, bcc, and K-saturated fcc phases was observed in C70Kx with increasing K concentration using x-ray-diffraction measurements. A model for the structure of the K-saturated fcc phase C70K9 is proposed. Superconductivity in each phase was checked using ac magnetic-susceptibility measurements. A small diamagnetic transition was observed below 12 K in the doped rhombohedral phase. All other phases were nonsuperconducting down to 1.3 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
C70Kx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	12	Pressure not reported	onset
C60K3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown