Anomaly in the electric resistivity of one-dimensional uneven peanut-shaped C60 polymer film at a low temperature

Abstract

We performed in situ four-probe measurements of the current-voltage characteristics of one-dimensional (1D) uneven peanut-shaped C60 polymer films in the temperature range 30–350 K under ultrahigh vacuum conditions (2 × 10−7 Pa). Arrhenius plots of the film resistance with respect to temperature showed two different electron-conduction mechanisms. While electrons are conducted via a thermal excitation hopping at temperatures above 160 K, the resistivity of the 1D polymer film exhibits an anomalous behavior that becomes fluctuated at a given value in the temperature range 40–90 K and decreases at temperatures below 40 K.

Structures, fundamental properties, and potential applications of low-dimensional C 60 polymers and other nanocarbons: a review

“…For a further study, we will examine the temperature dependence of R s for the 2D C 60 polymer film using in situ UHV four-probe measurement apparatus equipped with a helium cryostat [ 102 , 103 ].…”

Dynamical stability and low-temperature lattice specific heat of one-dimensional fullerene polymers

“…8 They can be formed through the generalized Stone-Wales (GSW) transformation 9 between adjacent C 60 molecules, while the geometry of the coalesced region has not been characterized. A wide variety of interesting phenomena including the photoexcited carrier relaxation, [10][11][12] the infrared anomaly, 13 and the anomalous low-temperature resistivity 14 have been observed, while a unified interpretation has not been settled.…”

Tomonaga-Luttinger liquid theory for metallic fullurene polymers

“…27 The irradiation induces sequential in-plane rotations of carbon-carbon (C-C) bonds followed by polymerization of adjacent C 60 molecules, resulting in a long, thin, peanut-shaped nanocarbon cylinder. From the first synthesis, many unexpected features have been confirmed in low-energy excitations of the 1D C 60 polymers [28][29][30][31][32][33][34] , which are largely different from those of straight-shaped counterparts (i.e., carbon nanotubes). Such the difference was also observed in the power-law exponent decribing the TLL states.…”