Locations of Rb ions in A2RbC60 (A=Na,K) superconductors

Ichiro Hirosawa; Hidekazu Kimura; Jun’ichiro Mizuki; Katsumi Tanigaki

doi:10.1103/PhysRevB.51.3038

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Locations of Rb ions in A2RbC60 (A=Na,K) superconductors

Ichiro Hirosawa, Hidekazu Kimura, Jun’ichiro Mizuki, Katsumi Tanigaki

DOI 10.1103/PhysRevB.51.3038 · Physical Review B

T1

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Abstract

We have found by extended x-ray-absorption fine structure measurements that Rb ions in Na2RbC60 and K2RbC60 are not centered on octahedral interstitial sites. Interatomic distances between Rb ions in octahedral sites and carbon atoms are the same as the distances between Rb ions in tetrahedral sites and carbon atoms. Simple lattice-energy calculations also show that the ions shift away from the center of the octahedral sites. These results suggest that the interactions between C60 and ions in O sites are important in tuning the orientations of C60 as well as T-site ions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
RbCs2C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown
K2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Na2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Na2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown